diff --git a/configure.py b/configure.py
index 67a0e63a5..954cfad85 100755
--- a/configure.py
+++ b/configure.py
@@ -495,14 +495,14 @@ config.libs = [
             Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_att_dist.cpp"),
             Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_bg_s.cpp"),
             Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_bg_s_acch.cpp"),
-            Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_bg_s_func.cpp"),
+            Object(Matching,    "d/d_bg_s_func.cpp"),
             Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_bg_s_lin_chk.cpp"),
             Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_bg_s_movebg_actor.cpp"),
-            Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_bg_s_spl_grp_chk.cpp"),
+            Object(Matching,    "d/d_bg_s_spl_grp_chk.cpp"),
             Object(Matching,    "d/d_bg_s_wtr_chk.cpp"),
             Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_bg_w.cpp"),
             Object(Matching,    "d/d_bg_w_deform.cpp"),
-            Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_bg_w_hf.cpp"),
+            Object(Matching,    "d/d_bg_w_hf.cpp"),
             Object(Matching,    "d/d_bg_w_sv.cpp"),
             Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_cc_d.cpp"),
             Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "d/d_cc_mass_s.cpp"),
@@ -643,7 +643,7 @@ config.libs = [
             Object(Matching,    "SSystem/SComponent/c_xyz.cpp"),
             Object(Matching,    "SSystem/SComponent/c_sxyz.cpp"),
             Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "SSystem/SComponent/c_math.cpp"),
-            Object(MatchingFor("GZLJ01", "GZLE01", "GZLP01"),    "SSystem/SComponent/c_bg_s.cpp"),
+            Object(Matching,    "SSystem/SComponent/c_bg_s.cpp"),
             Object(Matching,    "SSystem/SComponent/c_bg_s_chk.cpp"),
             Object(Matching,    "SSystem/SComponent/c_bg_s_gnd_chk.cpp"),
             Object(Matching,    "SSystem/SComponent/c_bg_s_lin_chk.cpp"),
diff --git a/include/SSystem/SComponent/c_bg_s.h b/include/SSystem/SComponent/c_bg_s.h
index 340820277..c71b33184 100644
--- a/include/SSystem/SComponent/c_bg_s.h
+++ b/include/SSystem/SComponent/c_bg_s.h
@@ -2,11 +2,9 @@
 #define C_BG_S_H
 
 #include "SSystem/SComponent/c_bg_s_poly_info.h"
+#include "SSystem/SComponent/c_m3d.h"
 #include "dolphin/types.h"
 
-#define C_BG_MIN_HEIGHT (-1e+9f)
-#define C_BG_MAX_HEIGHT (1e+9f)
-
 class fopAc_ac_c;
 class cBgS_ShdwDraw;
 class cBgS_LinChk;
diff --git a/include/SSystem/SComponent/c_m3d.h b/include/SSystem/SComponent/c_m3d.h
index 79d1de4fd..808036fc3 100644
--- a/include/SSystem/SComponent/c_m3d.h
+++ b/include/SSystem/SComponent/c_m3d.h
@@ -19,6 +19,11 @@ class cXyz;
 struct Vec;
 
 extern const f32 G_CM3D_F_ABS_MIN;
+#if VERSION == VERSION_DEMO
+extern const f32 G_CM3D_F_INF;
+#else
+#define G_CM3D_F_INF 1e+9f
+#endif
 
 extern const u32 BPCP_OUTCODE0;
 extern const u32 BPCP_OUTCODE1;
diff --git a/include/SSystem/SComponent/c_m3d_g_aab.h b/include/SSystem/SComponent/c_m3d_g_aab.h
index 8d0b0b1eb..f1e89556b 100644
--- a/include/SSystem/SComponent/c_m3d_g_aab.h
+++ b/include/SSystem/SComponent/c_m3d_g_aab.h
@@ -1,10 +1,9 @@
 #ifndef C_M3D_G_AAB_H
 #define C_M3D_G_AAB_H
 
-#include "SSystem/SComponent/c_bg_s.h"
-#include "SSystem/SComponent/c_xyz.h"
 #include "SSystem/SComponent/c_m3d.h"
 #include "SSystem/SComponent/c_m3d_g_lin.h"
+#include "SSystem/SComponent/c_xyz.h"
 #include "global.h"
 
 // Axis aligned bounding box
@@ -62,8 +61,8 @@ public:
         mMax.x = -1000000000.0f;
     }
     void ClearForMinMaxY() {
-        mMin.y = C_BG_MAX_HEIGHT;
-        mMax.y = C_BG_MIN_HEIGHT;
+        mMin.y = G_CM3D_F_INF;
+        mMax.y = -G_CM3D_F_INF;
     }
     void SetMinMaxY(f32 y) {
         if (mMin.y > y) {
diff --git a/include/d/d_bg_s.h b/include/d/d_bg_s.h
index 3c84d252f..42680cf25 100644
--- a/include/d/d_bg_s.h
+++ b/include/d/d_bg_s.h
@@ -121,7 +121,7 @@ public:
         mWallRadius = 0.0f;
         pm_pos = NULL;
         pm_old_pos = NULL;
-        mGroundH = C_BG_MIN_HEIGHT;
+        mGroundH = -G_CM3D_F_INF;
         field_0x60 = 0;
         field_0x68 = 20.0f;
         field_0x58 = NULL;
diff --git a/src/SSystem/SComponent/c_bg_s.cpp b/src/SSystem/SComponent/c_bg_s.cpp
index 83836432a..1f3c899e3 100644
--- a/src/SSystem/SComponent/c_bg_s.cpp
+++ b/src/SSystem/SComponent/c_bg_s.cpp
@@ -128,7 +128,7 @@ bool cBgS::LineCross(cBgS_LinChk* chk) {
 
 /* 802468E4-80246A14       .text GroundCross__4cBgSFP11cBgS_GndChk */
 f32 cBgS::GroundCross(cBgS_GndChk* chk) {
-    chk->SetNowY(C_BG_MIN_HEIGHT);
+    chk->SetNowY(-G_CM3D_F_INF);
     chk->ClearPi();
     chk->mWallPrecheck = (chk->mFlag & 0x02);
     chk->mGndPrecheck = (chk->mFlag & 0x01);
diff --git a/src/SSystem/SComponent/c_m3d.cpp b/src/SSystem/SComponent/c_m3d.cpp
index b9736eb9b..994537c71 100644
--- a/src/SSystem/SComponent/c_m3d.cpp
+++ b/src/SSystem/SComponent/c_m3d.cpp
@@ -21,6 +21,9 @@
 #define CHECK_PVEC3_RANGE(line, v) JUT_ASSERT(line, -1.0e32f < v->x && v->x < 1.0e32f && -1.0e32f < v->y && v->y < 1.0e32f && -1.0e32f < v->z && v->z < 1.0e32f)
 
 const f32 G_CM3D_F_ABS_MIN = 3.8146973e-06f;
+#if VERSION == VERSION_DEMO
+const f32 G_CM3D_F_INF = 1.0e38f;
+#endif
 
 static void dummy(f32 dummy) {
     // to fix float literal order
diff --git a/src/c/c_damagereaction.cpp b/src/c/c_damagereaction.cpp
index a36f22ec4..ccf0bf55f 100644
--- a/src/c/c_damagereaction.cpp
+++ b/src/c/c_damagereaction.cpp
@@ -653,7 +653,7 @@ void dr_body_bg_check(damagereaction* dr) {
         temp.z = z;
         gndChk.SetPos(&temp);
         f32 floor_y = dComIfG_Bgsp()->GroundCross(&gndChk);
-        if (floor_y != C_BG_MIN_HEIGHT && dr->mpEnemy->current.pos.y <= floor_y) {
+        if (floor_y != -G_CM3D_F_INF && dr->mpEnemy->current.pos.y <= floor_y) {
             dr->mpEnemy->current.pos.y = floor_y + REG0_F(13);
             dr->mMode = 0;
             dr->m47C = 0;
diff --git a/src/d/actor/d_a_agb.cpp b/src/d/actor/d_a_agb.cpp
index d6b3d74e5..88e8dccf1 100644
--- a/src/d/actor/d_a_agb.cpp
+++ b/src/d/actor/d_a_agb.cpp
@@ -1311,7 +1311,7 @@ void daAgb_c::CursorMove(fopAc_ac_c* actor, u32 stage_type) {
     
     cXyz r1_14;
     dBgS_GndChk r1_5C;
-    f32 f30 = C_BG_MIN_HEIGHT;
+    f32 f30 = -G_CM3D_F_INF;
     r1_5C.OffWall();
     r1_14.y = actor->current.pos.y + 150.0f;
     static cXy l_ckOffset[] = {
diff --git a/src/d/actor/d_a_am2.cpp b/src/d/actor/d_a_am2.cpp
index 0275a84ff..84ee4e76c 100644
--- a/src/d/actor/d_a_am2.cpp
+++ b/src/d/actor/d_a_am2.cpp
@@ -388,7 +388,7 @@ static BOOL Line_check(am2_class* i_this, cXyz destPos) {
 /* 0000177C-00001A24       .text naraku_check__FP9am2_class */
 static BOOL naraku_check(am2_class* i_this) {
     // Checks if the Armos has fallen into an abyss.
-    if (i_this->mAcch.GetGroundH() != C_BG_MIN_HEIGHT &&
+    if (i_this->mAcch.GetGroundH() != -G_CM3D_F_INF &&
         dComIfG_Bgsp()->ChkPolySafe(i_this->mAcch.m_gnd) &&
         dComIfG_Bgsp()->GetGroundCode(i_this->mAcch.m_gnd) == 4) // Abyss ground code
     {
diff --git a/src/d/actor/d_a_arrow.cpp b/src/d/actor/d_a_arrow.cpp
index bfd8dd988..40b4e1ce6 100644
--- a/src/d/actor/d_a_arrow.cpp
+++ b/src/d/actor/d_a_arrow.cpp
@@ -515,7 +515,7 @@ void daArrow_c::setRoomInfo() {
     
     mGndChk.SetPos(&current.pos);
     f32 groundY = dComIfG_Bgsp()->GroundCross(&mGndChk);
-    if (groundY != C_BG_MIN_HEIGHT) {
+    if (groundY != -G_CM3D_F_INF) {
         roomNo = dComIfG_Bgsp()->GetRoomId(mGndChk);
         tevStr.mEnvrIdxOverride = dComIfG_Bgsp()->GetPolyColor(mGndChk);
     } else {
diff --git a/src/d/actor/d_a_bk.cpp b/src/d/actor/d_a_bk.cpp
index 8deea0e4b..bf9f2d5c8 100644
--- a/src/d/actor/d_a_bk.cpp
+++ b/src/d/actor/d_a_bk.cpp
@@ -627,8 +627,8 @@ static u8 ground_4_check(bk_class* i_this, int r18, s16 r20, f32 f29) {
         sp8 += i_this->current.pos;
         gndChk.SetPos(&sp8);
         sp8.y = dComIfG_Bgsp()->GroundCross(&gndChk);
-        if (sp8.y == C_BG_MIN_HEIGHT) {
-            sp8.y = C_BG_MAX_HEIGHT;
+        if (sp8.y == -G_CM3D_F_INF) {
+            sp8.y = G_CM3D_F_INF;
         }
         if (i_this->dr.mAcch.GetGroundH() - sp8.y > 200.0f) {
             r19 |= check_bit[i];
@@ -4451,14 +4451,14 @@ static BOOL daBk_Execute(bk_class* i_this) {
         sp28.y += 50.0f - i_this->dr.m44C.y;
         gndChk.SetPos(&sp28);
         sp28.y = dComIfG_Bgsp()->GroundCross(&gndChk);
-        if (sp28.y != C_BG_MIN_HEIGHT) {
+        if (sp28.y != -G_CM3D_F_INF) {
             Vec temp;
             temp.x = sp28.x;
             temp.y = 50.0f + sp28.y;
             temp.z = sp28.z + f31;
             gndChk.SetPos(&temp);
             f32 f1 = dComIfG_Bgsp()->GroundCross(&gndChk);
-            if (f1 != C_BG_MIN_HEIGHT) {
+            if (f1 != -G_CM3D_F_INF) {
                 r21 = (s16)-cM_atan2s(f1 - sp28.y, temp.z - sp28.z);
                 if (r21 > 0x2000 || r21 < -0x2000) {
                     r21 = 0;
@@ -4469,7 +4469,7 @@ static BOOL daBk_Execute(bk_class* i_this) {
             temp.z = sp28.z;
             gndChk.SetPos(&temp);
             f1 = dComIfG_Bgsp()->GroundCross(&gndChk);
-            if (f1 != C_BG_MIN_HEIGHT) {
+            if (f1 != -G_CM3D_F_INF) {
                 r23 = (s16)cM_atan2s(f1 - sp28.y, temp.x - sp28.x);
                 if (r23 > 0x2000 || r23 < -0x2000) {
                     r23 = 0;
diff --git a/src/d/actor/d_a_boko.cpp b/src/d/actor/d_a_boko.cpp
index fc78b4f71..3d2cfa8de 100644
--- a/src/d/actor/d_a_boko.cpp
+++ b/src/d/actor/d_a_boko.cpp
@@ -70,7 +70,7 @@ void daBoko_c::setFlameEffect() {
 /* 00001340-000013CC       .text setRoomInfo__8daBoko_cFv */
 void daBoko_c::setRoomInfo() {
     int roomNo;
-    if (mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+    if (mAcch.GetGroundH() != -G_CM3D_F_INF) {
         roomNo = dComIfG_Bgsp()->GetRoomId(mAcch.m_gnd);
         tevStr.mEnvrIdxOverride = dComIfG_Bgsp()->GetPolyColor(mAcch.m_gnd);
     } else {
@@ -195,7 +195,7 @@ BOOL daBoko_c::procCarry() {
             int i;
             for (i = 0; i < 3; i++) {
                 m_ground_check.SetPos(&current.pos);
-                if (dComIfG_Bgsp()->GroundCross(&m_ground_check) != C_BG_MIN_HEIGHT) {
+                if (dComIfG_Bgsp()->GroundCross(&m_ground_check) != -G_CM3D_F_INF) {
                     break;
                 }
                 current.pos.x -= 50.0f * cM_ssin(shape_angle.y);
diff --git a/src/d/actor/d_a_bomb2.cpp b/src/d/actor/d_a_bomb2.cpp
index 1f697e9b5..30c1912e4 100644
--- a/src/d/actor/d_a_bomb2.cpp
+++ b/src/d/actor/d_a_bomb2.cpp
@@ -292,12 +292,12 @@ namespace daBomb2 {
         mAcch.ClrRoofNone();
         mAcch.m_roof_crr_height = 50.0f;
         mAcch.OnLineCheck();
-        field_0x51C = C_BG_MIN_HEIGHT;
-        field_0x520 = C_BG_MIN_HEIGHT;
+        field_0x51C = -G_CM3D_F_INF;
+        field_0x520 = -G_CM3D_F_INF;
         field_0x524 = 0;
         mbWaterIn = 0;
         field_0x526 = 0;
-        field_0x528 = C_BG_MIN_HEIGHT;
+        field_0x528 = -G_CM3D_F_INF;
     }
 
     dCcD_SrcSph Act_c::M_sph_src = {
@@ -553,7 +553,7 @@ namespace daBomb2 {
             r5 = true;
             field_0x526 = 1;
         } else {
-            field_0x520 = C_BG_MIN_HEIGHT;
+            field_0x520 = -G_CM3D_F_INF;
             field_0x526 = 0;
         }
         mbWaterIn = r5;
@@ -564,7 +564,7 @@ namespace daBomb2 {
     }
 
     bool Act_c::chk_lava_in() const {
-        if(field_0x51C == C_BG_MIN_HEIGHT) {
+        if(field_0x51C == -G_CM3D_F_INF) {
             return false;
         }
 
@@ -573,7 +573,7 @@ namespace daBomb2 {
 
     void Act_c::setRoomInfo() {
         s32 roomNo;
-        if(mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+        if(mAcch.GetGroundH() != -G_CM3D_F_INF) {
             roomNo = dComIfG_Bgsp()->GetRoomId(mAcch.m_gnd);
             tevStr.mEnvrIdxOverride = dComIfG_Bgsp()->GetPolyColor(mAcch.m_gnd);
         }
@@ -1092,7 +1092,7 @@ namespace daBomb2 {
     void Act_c::mode_sink() {
         f32 temp;
         bool temp2 = fopAcM_getWaterY(&current.pos, &temp);
-        if(temp2 && field_0x528 != C_BG_MIN_HEIGHT && --field_0x698 > 0) {
+        if(temp2 && field_0x528 != -G_CM3D_F_INF && --field_0x698 > 0) {
             current.pos.y += temp - field_0x528;
             field_0x528 = temp;
             posMoveF();
diff --git a/src/d/actor/d_a_bomb3.inc b/src/d/actor/d_a_bomb3.inc
index 8afe12d80..9998aef54 100644
--- a/src/d/actor/d_a_bomb3.inc
+++ b/src/d/actor/d_a_bomb3.inc
@@ -197,7 +197,7 @@ BOOL daBomb_c::draw() {
         draw_norm();
     }
 
-    if(fopAcM_GetModel(this) == 0 && mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+    if(fopAcM_GetModel(this) == 0 && mAcch.GetGroundH() != -G_CM3D_F_INF) {
         cM3dGPla* pNormal = dComIfG_Bgsp()->GetTriPla(mAcch.m_gnd);
         if(pNormal) {
             dComIfGd_setSimpleShadow(&current.pos, mAcch.GetGroundH(), 25.0f, pNormal->GetNP());
@@ -438,7 +438,7 @@ bool daBomb_c::checkExplodeBg() {
 /* 800DA320-800DA3A0       .text water_tention__8daBomb_cFv */
 void daBomb_c::water_tention() {
     if(chk_water_in()) {
-        if(field_0x558 != C_BG_MIN_HEIGHT && field_0x55C != C_BG_MIN_HEIGHT) {
+        if(field_0x558 != -G_CM3D_F_INF && field_0x55C != -G_CM3D_F_INF) {
             f32 temp = field_0x558 - field_0x55C;
             current.pos.y += temp < 0.0f ? 0.8f * temp : 0.2f * temp;
         }
@@ -533,7 +533,7 @@ void daBomb_c::bgCrrPos_water() {
         r5 = true;
         field_0x562 = 1;
     } else {
-        field_0x558 = C_BG_MIN_HEIGHT;
+        field_0x558 = -G_CM3D_F_INF;
         field_0x562 = 0;
     }
     field_0x560 = r5 && !mbWaterIn;
@@ -559,7 +559,7 @@ bool daBomb_c::chk_water_sink() {
 
 /* 800DA768-800DA794       .text chk_lava_hit__8daBomb_cFv */
 bool daBomb_c::chk_lava_hit() {
-    if(field_0x554 == C_BG_MIN_HEIGHT) {
+    if(field_0x554 == -G_CM3D_F_INF) {
         return false;
     }
 
@@ -568,7 +568,7 @@ bool daBomb_c::chk_lava_hit() {
 
 /* 800DA794-800DA7CC       .text chk_dead_zone__8daBomb_cFv */
 bool daBomb_c::chk_dead_zone() {
-    return mAcch.GetGroundH() == C_BG_MIN_HEIGHT && field_0x558 == C_BG_MIN_HEIGHT && field_0x554 == C_BG_MIN_HEIGHT;
+    return mAcch.GetGroundH() == -G_CM3D_F_INF && field_0x558 == -G_CM3D_F_INF && field_0x554 == -G_CM3D_F_INF;
 }
 
 /* 800DA7CC-800DA8C8       .text bound__8daBomb_cFf */
@@ -629,7 +629,7 @@ void daBomb_c::set_real_shadow_flag() {
 /* 800DA9DC-800DAA60       .text setRoomInfo__8daBomb_cFv */
 void daBomb_c::setRoomInfo() {
     s32 roomNo;
-    if(mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+    if(mAcch.GetGroundH() != -G_CM3D_F_INF) {
         roomNo = dComIfG_Bgsp()->GetRoomId(mAcch.m_gnd);
         tevStr.mEnvrIdxOverride = dComIfG_Bgsp()->GetPolyColor(mAcch.m_gnd);
     }
@@ -1398,9 +1398,9 @@ void daBomb_c::create_init() {
     mAcch.m_roof_crr_height = 50.0f;
     mAcch.OnLineCheck();
 
-    field_0x554 = C_BG_MIN_HEIGHT;
-    field_0x558 = C_BG_MIN_HEIGHT;
-    field_0x55C = C_BG_MIN_HEIGHT;
+    field_0x554 = -G_CM3D_F_INF;
+    field_0x558 = -G_CM3D_F_INF;
+    field_0x55C = -G_CM3D_F_INF;
     field_0x560 = 0;
     mbWaterIn = 0;
     field_0x562 = 0;
diff --git a/src/d/actor/d_a_esa.cpp b/src/d/actor/d_a_esa.cpp
index dda1fdeeb..d592ac232 100644
--- a/src/d/actor/d_a_esa.cpp
+++ b/src/d/actor/d_a_esa.cpp
@@ -52,7 +52,7 @@ void bg_check(esa_class* i_this) {
     cXyz sp54 = i_this->current.pos;
     sp54.y += 100.0f;
     f32 waterHeight = dBgS_GetWaterHeight(sp54);
-    if(waterHeight != C_BG_MIN_HEIGHT && i_this->mGroundHeight <= waterHeight) {
+    if(waterHeight != -G_CM3D_F_INF && i_this->mGroundHeight <= waterHeight) {
         i_this->mGroundHeight = waterHeight;
         state = 2;
     }
diff --git a/src/d/actor/d_a_fganon.cpp b/src/d/actor/d_a_fganon.cpp
index 0468d3c23..199953781 100644
--- a/src/d/actor/d_a_fganon.cpp
+++ b/src/d/actor/d_a_fganon.cpp
@@ -808,7 +808,7 @@ void down(fganon_class* i_this) {
     sp2C.y += 300.0f;
     gndChk.SetPos(&sp2C);
     f32 height = dComIfG_Bgsp()->GroundCross(&gndChk);
-    if (height != C_BG_MIN_HEIGHT && i_this->current.pos.y <= height) {
+    if (height != -G_CM3D_F_INF && i_this->current.pos.y <= height) {
         bVar3 = TRUE;
     }
     if ((i_this->m3A4[0] == 0) || bVar3) {
diff --git a/src/d/actor/d_a_ib.cpp b/src/d/actor/d_a_ib.cpp
index ed6a547fa..a2778dbcd 100644
--- a/src/d/actor/d_a_ib.cpp
+++ b/src/d/actor/d_a_ib.cpp
@@ -207,7 +207,7 @@ void daIball_c::checkGeo() {
     lavaChk.SetPos(&pos);
     f32 lavaY = dComIfG_Bgsp()->GroundCross(&lavaChk);
     f32 groundH = mAcch.GetGroundH();
-    if (lavaY != C_BG_MIN_HEIGHT) {
+    if (lavaY != -G_CM3D_F_INF) {
         f32 lava_depth = lavaY - groundH;
         if ((lava_depth < 20.0f && lavaY > current.pos.y) || (lava_depth >= 20.0f && lavaY > current.pos.y + 20.0f)) {
             fopAcM_seStartCurrent(this, JA_SE_OBJ_FALL_MAGMA_S, 0);
@@ -239,7 +239,7 @@ void daIball_c::mode_wait() {
     }
     
     f32 seaHeight = mAcch.GetSeaHeight();
-    if (seaHeight > current.pos.y && seaHeight != C_BG_MIN_HEIGHT) {
+    if (seaHeight > current.pos.y && seaHeight != -G_CM3D_F_INF) {
         mode_water_init();
         current.pos.y = seaHeight;
     }
@@ -255,10 +255,10 @@ void daIball_c::mode_water_init() {
 /* 800F3FE8-800F4054       .text mode_water__9daIball_cFv */
 void daIball_c::mode_water() {
     f32 seaHeight = mAcch.GetSeaHeight();
-    if (seaHeight == C_BG_MIN_HEIGHT || seaHeight < current.pos.y) {
+    if (seaHeight == -G_CM3D_F_INF || seaHeight < current.pos.y) {
         mode_wait_init();
     }
-    if (seaHeight != C_BG_MIN_HEIGHT) {
+    if (seaHeight != -G_CM3D_F_INF) {
         current.pos.y = seaHeight;
     }
 }
diff --git a/src/d/actor/d_a_item.cpp b/src/d/actor/d_a_item.cpp
index 5d284dbd5..70defcad5 100644
--- a/src/d/actor/d_a_item.cpp
+++ b/src/d/actor/d_a_item.cpp
@@ -1299,7 +1299,7 @@ void daItem_c::mode_wait() {
     temp.set(old.pos.x, old.pos.y, old.pos.z);
     lavaChk.SetPos(&temp);
     f32 lavaY = dComIfG_Bgsp()->GroundCross(&lavaChk);
-    if (lavaY != C_BG_MIN_HEIGHT && lavaY > current.pos.y) {
+    if (lavaY != -G_CM3D_F_INF && lavaY > current.pos.y) {
         fopAcM_delete(this);
     }
 }
diff --git a/src/d/actor/d_a_kita.cpp b/src/d/actor/d_a_kita.cpp
index 0ab82b541..14ec2771c 100644
--- a/src/d/actor/d_a_kita.cpp
+++ b/src/d/actor/d_a_kita.cpp
@@ -118,7 +118,7 @@ void kita_move(kita_class* i_this) {
                 lgc_pos.x = lgc_x; lgc_pos.y = lgc_y; lgc_pos.z = lgc_z;
                 liquid_ground_check.SetPos(&lgc_pos);
                 float liquid_gnd_cross = dComIfG_Bgsp()->GroundCross(&liquid_ground_check);
-                if(liquid_gnd_cross != C_BG_MIN_HEIGHT && liquid_gnd_cross > i_this->field_35C){
+                if(liquid_gnd_cross != -G_CM3D_F_INF && liquid_gnd_cross > i_this->field_35C){
                     i_this->field_35C = liquid_gnd_cross + 40.0f + REG0_F(17);
                     i_this->field_360 = 1;
                 }
diff --git a/src/d/actor/d_a_ks.cpp b/src/d/actor/d_a_ks.cpp
index c925977f4..7ad475d8d 100644
--- a/src/d/actor/d_a_ks.cpp
+++ b/src/d/actor/d_a_ks.cpp
@@ -130,7 +130,7 @@ void naraku_check(ks_class* i_this) {
     cXyz local_24;
     cXyz local_18;
 
-    if (i_this->mAcch.GetGroundH() != C_BG_MIN_HEIGHT && dComIfG_Bgsp()->ChkPolySafe(i_this->mAcch.m_gnd) && dComIfG_Bgsp()->GetGroundCode(i_this->mAcch.m_gnd) == 4) {
+    if (i_this->mAcch.GetGroundH() != -G_CM3D_F_INF && dComIfG_Bgsp()->ChkPolySafe(i_this->mAcch.m_gnd) && dComIfG_Bgsp()->GetGroundCode(i_this->mAcch.m_gnd) == 4) {
         i_this->m2D3++;
 
         if (i_this->current.pos.y < -500.0f || i_this->m2D3 > 0x32) {
diff --git a/src/d/actor/d_a_kt.cpp b/src/d/actor/d_a_kt.cpp
index 3bdf6c013..7f12d8655 100644
--- a/src/d/actor/d_a_kt.cpp
+++ b/src/d/actor/d_a_kt.cpp
@@ -101,7 +101,7 @@ void kotori_move(kt_class* i_this) {
 
             gndChk.SetPos(&i_this->mTargetPosHome);
             i_this->mTargetPosHome.y = dComIfG_Bgsp()->GroundCross(&gndChk);
-            if (i_this->mTargetPosHome.y == C_BG_MIN_HEIGHT)
+            if (i_this->mTargetPosHome.y == -G_CM3D_F_INF)
                 i_this->mTargetPosHome = player->current.pos;
             i_this->mTargetPos = i_this->mTargetPosHome;
             i_this->mSpeedLerp = 0.0f;
diff --git a/src/d/actor/d_a_leaflift.cpp b/src/d/actor/d_a_leaflift.cpp
index d7b431936..d9d30b368 100644
--- a/src/d/actor/d_a_leaflift.cpp
+++ b/src/d/actor/d_a_leaflift.cpp
@@ -113,7 +113,7 @@ void daLlift_c::CreateInit() {
     cXyz waterCheckPos = current.pos;
     waterCheckPos.y += 200.0f;
     mWaterY = dBgS_ObjGndChk_Wtr_Func(waterCheckPos);
-    if (mWaterY != C_BG_MIN_HEIGHT) {
+    if (mWaterY != -G_CM3D_F_INF) {
         cXyz particlePos = current.pos;
         particlePos.y = mWaterY + 1.0f; 
         mEmitter3 = dComIfGp_particle_set(dPa_name::ID_SCENE_82AA, &particlePos, &current.angle);
diff --git a/src/d/actor/d_a_nh.cpp b/src/d/actor/d_a_nh.cpp
index 8c2b37edd..f758dc1b0 100644
--- a/src/d/actor/d_a_nh.cpp
+++ b/src/d/actor/d_a_nh.cpp
@@ -274,7 +274,7 @@ void daNh_c::BGCheck() {
     dBgS_ObjGndChk_All gndChk;
     gndChk.SetPos(&current.pos);
     f32 groundY = dComIfG_Bgsp()->GroundCross(&gndChk);
-    if (groundY != C_BG_MIN_HEIGHT) {
+    if (groundY != -G_CM3D_F_INF) {
         mGroundY = groundY;
         tevStr.mRoomNo = current.roomNo = dComIfG_Bgsp()->GetRoomId(gndChk);
         tevStr.mEnvrIdxOverride = dComIfG_Bgsp()->GetPolyColor(gndChk);
diff --git a/src/d/actor/d_a_npc_kamome.cpp b/src/d/actor/d_a_npc_kamome.cpp
index a3ae1b533..a72e1a2d0 100644
--- a/src/d/actor/d_a_npc_kamome.cpp
+++ b/src/d/actor/d_a_npc_kamome.cpp
@@ -1286,7 +1286,7 @@ BOOL daNpc_kam_c::execute() {
         
         if (!isNoBgCheck()) {
             mAcch.CrrPos(*dComIfG_Bgsp());
-            if (mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+            if (mAcch.GetGroundH() != -G_CM3D_F_INF) {
                 s8 roomNo = dComIfG_Bgsp()->GetRoomId(mAcch.m_gnd);
                 fopAcM_SetRoomNo(this, roomNo);
                 tevStr.mRoomNo = roomNo;
diff --git a/src/d/actor/d_a_npc_os.cpp b/src/d/actor/d_a_npc_os.cpp
index 1bc5aeb42..72177f3ea 100644
--- a/src/d/actor/d_a_npc_os.cpp
+++ b/src/d/actor/d_a_npc_os.cpp
@@ -2131,7 +2131,7 @@ BOOL daNpc_Os_c::execute() {
             mAcch.CrrPos(*dComIfG_Bgsp());
             
             field_0x784 |= 0x10;
-            if(mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+            if(mAcch.GetGroundH() != -G_CM3D_F_INF) {
                 tevStr.mRoomNo = dComIfG_Bgsp()->GetRoomId(mAcch.m_gnd);
                 tevStr.mEnvrIdxOverride = dComIfG_Bgsp()->GetPolyColor(mAcch.m_gnd);
 
@@ -2208,7 +2208,7 @@ BOOL daNpc_Os_c::execute() {
             }
         }
 
-        if(mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+        if(mAcch.GetGroundH() != -G_CM3D_F_INF) {
             cM3dGPla* plane = dComIfG_Bgsp()->GetTriPla(mAcch.m_gnd.GetBgIndex(), mAcch.m_gnd.GetPolyIndex());
             if(plane) {
                 field_0x7F0 = *plane->GetNP();
@@ -2228,7 +2228,7 @@ BOOL daNpc_Os_c::execute() {
 
         field_0x7A8 = mAcch.ChkGroundHit();
         if(!fopAcM_checkCarryNow(this)) {
-            if(mAcch.GetGroundH() == C_BG_MIN_HEIGHT || dComIfG_Bgsp()->GetGroundCode(mAcch.m_gnd) == 4) {
+            if(mAcch.GetGroundH() == -G_CM3D_F_INF || dComIfG_Bgsp()->GetGroundCode(mAcch.m_gnd) == 4) {
                 if(m4E8 < 30) {
                     m4E8 += 1;
                 }
@@ -2270,7 +2270,7 @@ BOOL daNpc_Os_c::execute() {
         mAcch.CrrPos(*dComIfG_Bgsp());
 
         field_0x784 |= 0x10;
-        if(mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+        if(mAcch.GetGroundH() != -G_CM3D_F_INF) {
             tevStr.mRoomNo = dComIfG_Bgsp()->GetRoomId(mAcch.m_gnd);
             tevStr.mEnvrIdxOverride = dComIfG_Bgsp()->GetPolyColor(mAcch.m_gnd);
         }
diff --git a/src/d/actor/d_a_npc_people.cpp b/src/d/actor/d_a_npc_people.cpp
index e2cbeea50..14e3b0ba0 100644
--- a/src/d/actor/d_a_npc_people.cpp
+++ b/src/d/actor/d_a_npc_people.cpp
@@ -4547,7 +4547,7 @@ cPhs_State daNpcPeople_c::createInit() {
 
     if(mNpcType != 0xB) {
         mObjAcch.CrrPos(*dComIfG_Bgsp());
-        if(C_BG_MIN_HEIGHT != mObjAcch.GetGroundH()) {
+        if(-G_CM3D_F_INF != mObjAcch.GetGroundH()) {
             current.pos.y = home.pos.y = mObjAcch.GetGroundH();
         }
     }
diff --git a/src/d/actor/d_a_npc_roten.cpp b/src/d/actor/d_a_npc_roten.cpp
index 3fab4b7fd..45404ef81 100644
--- a/src/d/actor/d_a_npc_roten.cpp
+++ b/src/d/actor/d_a_npc_roten.cpp
@@ -1760,7 +1760,7 @@ cPhs_State daNpcRoten_c::createInit() {
     fopAcM_setCullSizeBox(this, -200.0f, 0.0f, -200.0f, 200.0f, 300.0f, 200.0f);
 
     mObjAcch.CrrPos(*dComIfG_Bgsp());
-    if(C_BG_MIN_HEIGHT != mObjAcch.GetGroundH()) {
+    if(-G_CM3D_F_INF != mObjAcch.GetGroundH()) {
         current.pos.y = home.pos.y = mObjAcch.GetGroundH();
     }
 
diff --git a/src/d/actor/d_a_obj_barrel.cpp b/src/d/actor/d_a_obj_barrel.cpp
index dd46e8072..783c9df2b 100644
--- a/src/d/actor/d_a_obj_barrel.cpp
+++ b/src/d/actor/d_a_obj_barrel.cpp
@@ -727,7 +727,7 @@ bool daObjBarrel::Act_c::_draw() {
         float gndH = mAcch.GetGroundH();
         cM3dGPla* gndPlane = dComIfG_Bgsp()->GetTriPla(mAcch.m_gnd);
         cXyz *norm = gndPlane->GetNP();
-        if (gndPlane && gndH != C_BG_MIN_HEIGHT) {
+        if (gndPlane && gndH != -G_CM3D_F_INF) {
             dComIfGd_setSimpleShadow(&current.pos, gndH, attr().m02, norm);        
         }
     }
diff --git a/src/d/actor/d_a_obj_movebox.cpp b/src/d/actor/d_a_obj_movebox.cpp
index 11ba8f9ea..de96ffe47 100644
--- a/src/d/actor/d_a_obj_movebox.cpp
+++ b/src/d/actor/d_a_obj_movebox.cpp
@@ -114,7 +114,7 @@ namespace daObjMovebox {
     
     /* 000001F0-000003A4       .text gnd_pos__Q212daObjMovebox5Bgc_cFPCQ212daObjMovebox5Act_cPCQ212daObjMovebox8BgcSrc_cif */
     void Bgc_c::gnd_pos(const Act_c* movebox, const BgcSrc_c* bgcSrc, int bgcSrcCount, f32 param_4) {
-        f32 maxGroundY = C_BG_MIN_HEIGHT;
+        f32 maxGroundY = -G_CM3D_F_INF;
         
         mDoMtx_stack_c::transS(movebox->current.pos);
         mDoMtx_stack_c::YrotM(movebox->home.angle.y);
@@ -1870,7 +1870,7 @@ namespace daObjMovebox {
             int temp = mBgc.mMaxGroundIdx;
             f32 groundH = mBgc.mGroundY[temp];
             cM3dGPla* triPla = dComIfG_Bgsp()->GetTriPla(Bgc_c::M_gnd_work[temp]);
-            if (triPla && groundH != C_BG_MIN_HEIGHT) {
+            if (triPla && groundH != -G_CM3D_F_INF) {
                 dComIfGd_setSimpleShadow(&current.pos, groundH, i_attr()->m10, triPla->GetNP(), shape_angle.y, 1.0f, NULL);
             }
         }
diff --git a/src/d/actor/d_a_player_climb.inc b/src/d/actor/d_a_player_climb.inc
index bc302e7d3..b4e99e186 100644
--- a/src/d/actor/d_a_player_climb.inc
+++ b/src/d/actor/d_a_player_climb.inc
@@ -190,7 +190,7 @@ void daPy_lk_c::checkBgClimbMove() {
         local_5c.set(current.pos.x + (25.0f * dVar7), local_68.y + 30.0f, current.pos.z + (25.0f * dVar6));
         mGndChk.SetPos(&local_5c);
         dVar3 = dComIfG_Bgsp()->GroundCross(&mGndChk);
-        if (C_BG_MIN_HEIGHT != dVar3 && cBgW_CheckBGround(dComIfG_Bgsp()->GetTriPla(mGndChk)->GetNP()->y) &&
+        if (-G_CM3D_F_INF != dVar3 && cBgW_CheckBGround(dComIfG_Bgsp()->GetTriPla(mGndChk)->GetNP()->y) &&
             dVar3 >= local_68.y - 30.0f)
         {
             dVar4 = 3.0f;
diff --git a/src/d/actor/d_a_player_hammer.inc b/src/d/actor/d_a_player_hammer.inc
index 5241f420a..0b2ff775f 100644
--- a/src/d/actor/d_a_player_hammer.inc
+++ b/src/d/actor/d_a_player_hammer.inc
@@ -51,7 +51,7 @@ void daPy_lk_c::setHammerQuake(cBgS_PolyInfo* param_1, const cXyz* param_2, int
             local_2c.set(mSwordTopPos.x, mSwordTopPos.y + 100.0f, mSwordTopPos.z);
             mGndChk.SetPos(&local_2c);
             dVar9 = dComIfG_Bgsp()->GroundCross(&mGndChk);
-            if (C_BG_MIN_HEIGHT != dVar9) {
+            if (-G_CM3D_F_INF != dVar9) {
                 iVar6 = dComIfG_Bgsp()->GetMtrlSndId(mGndChk);
             } else {
                 iVar6 = mMtrlSndId;
@@ -334,7 +334,7 @@ BOOL daPy_lk_c::procHammerFrontSwing() {
                 int r26;
                 r26 = -1;
                 f32 f30 = 300.0f;
-                f32 f31 = C_BG_MIN_HEIGHT;
+                f32 f31 = -G_CM3D_F_INF;
                 for (r27 = 0; r27 < mSwBlur.field_0x014; r27++) {
                     sp08.set(mSwBlur.field_0x034[r27].x, f30 + mSwBlur.field_0x034[r27].y, mSwBlur.field_0x034[r27].z);
                     mGndChk.SetPos(&sp08);
diff --git a/src/d/actor/d_a_player_hang.inc b/src/d/actor/d_a_player_hang.inc
index 03bb0a907..d3abf490b 100644
--- a/src/d/actor/d_a_player_hang.inc
+++ b/src/d/actor/d_a_player_hang.inc
@@ -114,7 +114,7 @@ int daPy_lk_c::changeHangEndProc(int param_0) {
 
     mGndChk.SetPos(&pos);
     m35DC = dComIfG_Bgsp()->GroundCross(&mGndChk);
-    if (C_BG_MIN_HEIGHT != m35DC) {
+    if (-G_CM3D_F_INF != m35DC) {
         m3588 = dComIfG_Bgsp()->GetAttributeCode(mGndChk);
     } else {
         m3588 = dBgS_Attr_UNK1B_e;
@@ -281,7 +281,7 @@ BOOL daPy_lk_c::procHangFallStart_init(cM3dGPla* param_0) {
     mGndChk.SetPos(&local_34);
     f32 cross = dComIfG_Bgsp()->GroundCross(&mGndChk);
     local_34.y = cross;
-    if (local_34.y != C_BG_MIN_HEIGHT) {
+    if (local_34.y != -G_CM3D_F_INF) {
         if (local_34.y < -30.1f + current.pos.y) {
             return false;
         }
diff --git a/src/d/actor/d_a_player_main.cpp b/src/d/actor/d_a_player_main.cpp
index 8ae11fcc2..90e3fd79b 100644
--- a/src/d/actor/d_a_player_main.cpp
+++ b/src/d/actor/d_a_player_main.cpp
@@ -1553,7 +1553,7 @@ void daPy_lk_c::drawShadow() {
     local_30.y = pMVar3[1][3];
     local_30.z = pMVar3[2][3];
     if (checkGrabWear()) {
-        if ((C_BG_MIN_HEIGHT != mAcch.GetGroundH()) && (dComIfG_Bgsp()->ChkPolySafe(mAcch.m_gnd))) {
+        if ((-G_CM3D_F_INF != mAcch.GetGroundH()) && (dComIfG_Bgsp()->ChkPolySafe(mAcch.m_gnd))) {
             dComIfGd_setSimpleShadow2(&local_30, mAcch.GetGroundH(), 30.0f, mAcch.m_gnd, 0, 1.0f,
                                       &dDlst_shadowControl_c::mSimpleTexObj);
         }
@@ -3540,7 +3540,7 @@ void daPy_lk_c::deleteEquipItem(BOOL param_1) {
 void daPy_lk_c::setFallVoice() {
     if ((!checkNoResetFlg0(daPyFlg0_NO_FALL_VOICE) &&
          ((((!checkNoResetFlg0(daPyFlg0_UNK80) || m35D0 < mAcch.GetGroundH()) || m3580 == 4) ||
-           C_BG_MIN_HEIGHT == mAcch.GetGroundH()))) &&
+           -G_CM3D_F_INF == mAcch.GetGroundH()))) &&
         (m35F0 - current.pos.y > 500.0f))
     {
         if (current.pos.y - mAcch.GetGroundH() >= 100.0f * daPy_HIO_fall_c0::m.field_0x14) {
@@ -4662,7 +4662,7 @@ void daPy_lk_c::setFrontWallType() {
         if (!checkModeFlg(ModeFlg_SWIM) && dVar16 < current.pos.y) {
             return;
         }
-        if (dVar16 == C_BG_MIN_HEIGHT || !cBgW_CheckBGround(dComIfG_Bgsp()->GetTriPla(mGndChk)->GetNP()->y)) {
+        if (dVar16 == -G_CM3D_F_INF || !cBgW_CheckBGround(dComIfG_Bgsp()->GetTriPla(mGndChk)->GetNP()->y)) {
             return;
         }
         cXyz sp3C;
@@ -8710,7 +8710,7 @@ void daPy_lk_c::footBgCheck() {
         } else {
             sp10[i] = 0;
         }
-        if (f1 != C_BG_MIN_HEIGHT && sp5C.y - f1 < 60.2f) {
+        if (f1 != -G_CM3D_F_INF && sp5C.y - f1 < 60.2f) {
             *r26 = f1;
             r25_r26->field_0x000 = 1;
         } else {
@@ -10696,7 +10696,7 @@ BOOL daPy_lk_c::checkLavaFace(cXyz* oldPos, int attributeCode) {
         mLavaGndChk.SetPos(&pos);
         m35D4 = dComIfG_Bgsp()->GroundCross(&mLavaGndChk);
         if (mAcch.GetGroundH() > m35D4) {
-            m35D4 = C_BG_MIN_HEIGHT;
+            m35D4 = -G_CM3D_F_INF;
         }
         if (m35D4 > current.pos.y) {
             attributeCode = dComIfG_Bgsp()->GetAttributeCode(mLavaGndChk);
@@ -10731,7 +10731,7 @@ void daPy_lk_c::checkFallCode() {
     f32 dVar6;
     cXyz local_44;
 
-    if (m3580 == 4 || C_BG_MIN_HEIGHT == mAcch.GetGroundH()) {
+    if (m3580 == 4 || -G_CM3D_F_INF == mAcch.GetGroundH()) {
         bVar4 = m35D0 > mAcch.GetGroundH() ? TRUE : FALSE;
         if (((((!bVar4) && checkModeFlg(ModeFlg_MIDAIR)) &&
               (!checkModeFlg(ModeFlg_HOOKSHOT) && (m35F4 - current.pos.y > 100.0f * daPy_HIO_fall_c0::m.field_0x14))) ||
@@ -10955,7 +10955,7 @@ void daPy_lk_c::setShapeAngleOnGround() {
             mDoMtx_stack_c::multVec(&l_crawl_back_up_offset, &local_50);
             mGndChk.SetPos(&local_44);
             local_44.y = dComIfG_Bgsp()->GroundCross(&mGndChk);
-            if (C_BG_MIN_HEIGHT != local_44.y) {
+            if (-G_CM3D_F_INF != local_44.y) {
                 triPla = dComIfG_Bgsp()->GetTriPla(mGndChk);
             } else {
                 triPla = NULL;
@@ -10967,7 +10967,7 @@ void daPy_lk_c::setShapeAngleOnGround() {
             }
             mGndChk.SetPos(&local_50);
             local_50.y = dComIfG_Bgsp()->GroundCross(&mGndChk);
-            if (C_BG_MIN_HEIGHT != local_50.y) {
+            if (-G_CM3D_F_INF != local_50.y) {
                 triPla = dComIfG_Bgsp()->GetTriPla(mGndChk);
             } else {
                 triPla = NULL;
@@ -11245,7 +11245,7 @@ BOOL daPy_lk_c::execute() {
         !dComIfGp_checkPlayerStatus0(0, daPyStts0_SHIP_RIDE_e) &&
         !checkModeFlg(ModeFlg_ROPE | ModeFlg_CLIMB | ModeFlg_LADDER) &&
         mCurProc != daPyProc_DEMO_TOOL_e &&
-        mAcch.GetGroundH() != C_BG_MIN_HEIGHT &&
+        mAcch.GetGroundH() != -G_CM3D_F_INF &&
         !checkNoResetFlg0((daPy_FLG0)(daPyFlg0_UNK20000000 | daPyFlg0_UNK80000000)) &&
         dComIfG_Bgsp()->ChkPolySafe(mAcch.m_gnd) &&
         dComIfG_Bgsp()->ChkMoveBG(mAcch.m_gnd)
@@ -11403,7 +11403,7 @@ BOOL daPy_lk_c::execute() {
         }
     } else if (mCurProc == daPyProc_DEMO_TOOL_e) {
         current.pos = sp14;
-        if (m3574 != 0 && mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+        if (m3574 != 0 && mAcch.GetGroundH() != -G_CM3D_F_INF) {
             current.pos.y = mAcch.GetGroundH();
         }
     } else if (mCurProc == daPyProc_HOOKSHOT_FLY_e ||
@@ -11423,7 +11423,7 @@ BOOL daPy_lk_c::execute() {
     }
     
     int roomNo;
-    if (mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+    if (mAcch.GetGroundH() != -G_CM3D_F_INF) {
         roomNo = setRoomInfo();
         m357C = m3580;
         m3580 = dComIfG_Bgsp()->GetGroundCode(mAcch.m_gnd);
@@ -12398,7 +12398,7 @@ cPhs_State daPy_lk_c::makeBgWait() {
         m352E--;
     }
     mAcch.CrrPos(*dComIfG_Bgsp());
-    if ((C_BG_MIN_HEIGHT == mAcch.GetGroundH()) ||
+    if ((-G_CM3D_F_INF == mAcch.GetGroundH()) ||
         (((m352E != 0 && (dComIfG_Bgsp()->ChkMoveBG(mAcch.m_gnd))) &&
           (fopAcM_GetName(dComIfG_Bgsp()->GetActorPointer(mAcch.m_gnd.GetBgIndex())) ==
            PROC_TBOX))))
diff --git a/src/d/actor/d_a_player_npc.cpp b/src/d/actor/d_a_player_npc.cpp
index b6d819005..7f87d478d 100644
--- a/src/d/actor/d_a_player_npc.cpp
+++ b/src/d/actor/d_a_player_npc.cpp
@@ -13,7 +13,7 @@
 int daPy_npc_c::check_initialRoom() {
     if (home.roomNo < 0) {
         mAcch.CrrPos(*dComIfG_Bgsp());
-        if (mAcch.GetGroundH() == C_BG_MIN_HEIGHT || dComIfG_Bgsp()->GetGroundCode(mAcch.m_gnd) == 4) {
+        if (mAcch.GetGroundH() == -G_CM3D_F_INF || dComIfG_Bgsp()->GetGroundCode(mAcch.m_gnd) == 4) {
             return 0;
         }
         int roomNo = dComIfG_Bgsp()->GetRoomId(mAcch.m_gnd);
diff --git a/src/d/actor/d_a_player_particle.inc b/src/d/actor/d_a_player_particle.inc
index 614651685..0bc9202ee 100644
--- a/src/d/actor/d_a_player_particle.inc
+++ b/src/d/actor/d_a_player_particle.inc
@@ -37,7 +37,7 @@ void daPy_swimTailEcallBack_c::getMaxWaterY(JGeometry::TVec3<f32>* pos) {
         if (field_0x10 > pos->y) {
             pos->y = field_0x10 + 2.0f;
         }
-    } else if (field_0x10 != C_BG_MIN_HEIGHT) {
+    } else if (field_0x10 != -G_CM3D_F_INF) {
         pos->y = field_0x10 + 2.0f;
     } else {
         pos->y = field_0x0C;
@@ -893,7 +893,7 @@ void daPy_lk_c::setFootMark(cXyz* i_pos) {
     mGndChk.SetPos(&pos);
 
     pos.y = dComIfG_Bgsp()->GroundCross(&mGndChk);
-    if (pos.y != C_BG_MIN_HEIGHT && dComIfG_Bgsp()->GetAttributeCode(mGndChk) == dBgS_Attr_SAND_e) {
+    if (pos.y != -G_CM3D_F_INF && dComIfG_Bgsp()->GetAttributeCode(mGndChk) == dBgS_Attr_SAND_e) {
         fopKyM_create(PROC_WATER_MARK, (shape_angle.y << 16) | 2, &pos, &scale, NULL);
     }
 
@@ -1042,7 +1042,7 @@ void daPy_lk_c::setFootEffect() {
             mGndChk.SetPos(&pos);
 
             f32 groundY = dComIfG_Bgsp()->GroundCross(&mGndChk);
-            if (groundY != C_BG_MIN_HEIGHT) {
+            if (groundY != -G_CM3D_F_INF) {
                 pos.y = groundY;
             }
 
@@ -1133,7 +1133,7 @@ void daPy_lk_c::setWaterDrop() {
         return;
     }
 
-    if (dKyr_player_overhead_bg_chk() && dStage_stagInfo_GetSTType(dComIfGp_getStageStagInfo()) != dStageType_MISC_e && mCurProc != daPyProc_DEMO_LAST_COMBO_e && mAcch.m_roof_y == C_BG_MAX_HEIGHT) {
+    if (dKyr_player_overhead_bg_chk() && dStage_stagInfo_GetSTType(dComIfGp_getStageStagInfo()) != dStageType_MISC_e && mCurProc != daPyProc_DEMO_LAST_COMBO_e && mAcch.m_roof_y == G_CM3D_F_INF) {
         if (m3460[0].getEmitter() == NULL) {
             m3460[0].makeEmitter(dPa_name::ID_COMMON_0432, mpCLModel->getAnmMtx(0x0E), &current.pos, NULL);
         }
diff --git a/src/d/actor/d_a_player_swim.inc b/src/d/actor/d_a_player_swim.inc
index ea4d0e7ba..693bc7554 100644
--- a/src/d/actor/d_a_player_swim.inc
+++ b/src/d/actor/d_a_player_swim.inc
@@ -214,7 +214,7 @@ BOOL daPy_lk_c::checkSwimFallCheck() {
 BOOL daPy_lk_c::changeSwimOutProc() {
     cM3dGPla* pcVar1;
     
-    if (mAcch.GetGroundH() != C_BG_MIN_HEIGHT && dComIfG_Bgsp()->ChkPolySafe(mAcch.m_gnd)) {
+    if (mAcch.GetGroundH() != -G_CM3D_F_INF && dComIfG_Bgsp()->ChkPolySafe(mAcch.m_gnd)) {
         pcVar1 = dComIfG_Bgsp()->GetTriPla(mAcch.m_gnd);   
     }
     else {
diff --git a/src/d/actor/d_a_player_whide.inc b/src/d/actor/d_a_player_whide.inc
index 16762518a..73ef344ca 100644
--- a/src/d/actor/d_a_player_whide.inc
+++ b/src/d/actor/d_a_player_whide.inc
@@ -99,7 +99,7 @@ cM3dGPla* daPy_lk_c::getWHideModePolygon(cXyz* param_0, cXyz* param_1, cXyz* par
     local_3c.z = param_2->z + cM_ssin(uVar3) * daPy_HIO_wall_c0::m.field_0x50;
     mGndChk.SetPos(&local_3c);
     float f31 = bgs->GroundCross(&mGndChk);
-    if (C_BG_MIN_HEIGHT != f31 && (!cBgW_CheckBGround(bgs->GetTriPla(mGndChk)->GetNP()->y))) {
+    if (-G_CM3D_F_INF != f31 && (!cBgW_CheckBGround(bgs->GetTriPla(mGndChk)->GetNP()->y))) {
         return NULL;
     }
 
@@ -383,7 +383,7 @@ BOOL daPy_lk_c::procWHideWait() {
         mAcchCir[2].SetWallH(125.0f);
     }
 
-    if (mStickDistance > 0.05f && C_BG_MIN_HEIGHT != mAcch.GetGroundH() &&
+    if (mStickDistance > 0.05f && -G_CM3D_F_INF != mAcch.GetGroundH() &&
         cBgW_CheckBGround(dComIfG_Bgsp()->GetTriPla(mAcch.m_gnd)->GetNP()->y))
     {
         int direction = getDirectionFromCurrentAngle();
@@ -451,7 +451,7 @@ BOOL daPy_lk_c::procWHideMove() {
     f32 fVar2;
     if (checkWHideModeChange(&acStack_24) != 0) {
         fVar2 = 0.0f;
-    } else if (mStickDistance > 0.05f && C_BG_MIN_HEIGHT != mAcch.GetGroundH() &&
+    } else if (mStickDistance > 0.05f && -G_CM3D_F_INF != mAcch.GetGroundH() &&
                cBgW_CheckBGround(dComIfG_Bgsp()->GetTriPla(mAcch.m_gnd)->GetNP()->y))
     {
         int direction = getDirectionFromCurrentAngle();
@@ -491,7 +491,7 @@ BOOL daPy_lk_c::procWHideMove() {
     if (std::fabsf(mVelocity) <= 0.001f) {
         return procWHideWait_init();
     }
-    if (mAcch.GetGroundH() == C_BG_MIN_HEIGHT || !cBgW_CheckBGround(dComIfG_Bgsp()->GetTriPla(mAcch.m_gnd)->GetNP()->y) ||
+    if (mAcch.GetGroundH() == -G_CM3D_F_INF || !cBgW_CheckBGround(dComIfG_Bgsp()->GetTriPla(mAcch.m_gnd)->GetNP()->y) ||
         !checkWHideBackWall(&cStack_30))
     {
         mVelocity = 0.0f;
diff --git a/src/d/actor/d_a_shand.cpp b/src/d/actor/d_a_shand.cpp
index b02a93a00..c703ebaa6 100644
--- a/src/d/actor/d_a_shand.cpp
+++ b/src/d/actor/d_a_shand.cpp
@@ -260,12 +260,12 @@ void hand_move(shand_class* i_this) {
                     chk_pos_y += 200.0f;
                     local_100.GetPointP()->set(chk_pos_x, chk_pos_y, chk_pos_z);
                     float spl_ground_y = dComIfG_Bgsp()->GroundCross(&local_100) + 10.0f;
-                    if(spl_ground_y != C_BG_MIN_HEIGHT){
+                    if(spl_ground_y != -G_CM3D_F_INF){
                         i_this->ground_y = spl_ground_y;
                     }
                 }
                 else {
-                    i_this->ground_y = C_BG_MIN_HEIGHT;
+                    i_this->ground_y = -G_CM3D_F_INF;
                 }
                 i_this->mState = 2;
 
diff --git a/src/d/actor/d_a_ship.cpp b/src/d/actor/d_a_ship.cpp
index fc52ed1f1..6ade5838f 100644
--- a/src/d/actor/d_a_ship.cpp
+++ b/src/d/actor/d_a_ship.cpp
@@ -770,7 +770,7 @@ void daShip_c::getMaxWaterY(cXyz* shipPos) {
         }
     }
     else {
-        if (m03F8 != C_BG_MIN_HEIGHT) {
+        if (m03F8 != -G_CM3D_F_INF) {
             shipPos->y = m03F8;
         }
         else {
@@ -831,7 +831,7 @@ f32 daShip_c::getWaterY() {
         m03F8 = mAcch.m_wtr.GetHeight();
     }
     else {
-        m03F8 = C_BG_MIN_HEIGHT;
+        m03F8 = -G_CM3D_F_INF;
     }
     if (daSea_ChkArea(current.pos.x, current.pos.z)) {
         waterY = daSea_calcWave(current.pos.x, current.pos.z);
@@ -3024,7 +3024,7 @@ void daShip_c::setEffectData(float param_1, short param_2) {
 /* 000085D8-00008688       .text setRoomInfo__8daShip_cFv */
 void daShip_c::setRoomInfo() {
     int roomId;
-    if (mAcch.GetGroundH() != C_BG_MIN_HEIGHT) {
+    if (mAcch.GetGroundH() != -G_CM3D_F_INF) {
         roomId = dComIfG_Bgsp()->GetRoomId(mAcch.m_gnd);
         tevStr.mEnvrIdxOverride = dComIfG_Bgsp()->GetPolyColor(mAcch.m_gnd);
         m03C4 = dComIfG_Bgsp()->GetGroundCode(mAcch.m_gnd);
@@ -3820,7 +3820,7 @@ BOOL daShip_c::execute() {
                     else {
                         cXyz sp108;
                         int sp18;
-                        if (mAcch.GetGroundH() != C_BG_MIN_HEIGHT && dPath_GetPolyRoomPathVec(mAcch.m_gnd, &sp108, &sp18)) {
+                        if (mAcch.GetGroundH() != -G_CM3D_F_INF && dPath_GetPolyRoomPathVec(mAcch.m_gnd, &sp108, &sp18)) {
                             sp108.normalizeZP();
                             sp108 *= sp18 >> 1;
                             cLib_addCalcPosXZ(&m1044, sp108, 0.5f, 5.0f, 1.0f);
diff --git a/src/d/d_bg_s.cpp b/src/d/d_bg_s.cpp
index b396e9268..1eca3ff9a 100644
--- a/src/d/d_bg_s.cpp
+++ b/src/d/d_bg_s.cpp
@@ -354,7 +354,7 @@ void dBgS::WallCorrect(dBgS_Acch* acch) {
 
 /* 800A13E0-800A14FC       .text RoofChk__4dBgSFP12dBgS_RoofChk */
 f32 dBgS::RoofChk(dBgS_RoofChk* chk) {
-    chk->SetNowY(C_BG_MAX_HEIGHT);
+    chk->SetNowY(G_CM3D_F_INF);
     chk->ClearPi();
     cBgS_ChkElm* elm;
     for (s32 bg_index = 0; bg_index < (s32)ARRAY_SIZE(m_chk_element); bg_index++) {
@@ -606,7 +606,7 @@ void dBgS_CrrPos::CrrPos(dBgS& i_bgs) {
         mGndChk.SetPos(&pos);
         f32 f31 = pm_pos->y;
         mGroundH = i_bgs.GroundCross(&mGndChk);
-        if (mGroundH != C_BG_MIN_HEIGHT && mGroundH > f31) {
+        if (mGroundH != -G_CM3D_F_INF && mGroundH > f31) {
             pm_pos->y = mGroundH;
             if (field_0x58) {
                 field_0x58->y = 0.0f;
diff --git a/src/d/d_bg_s_acch.cpp b/src/d/d_bg_s_acch.cpp
index 65102d746..c28f50a04 100644
--- a/src/d/d_bg_s_acch.cpp
+++ b/src/d/d_bg_s_acch.cpp
@@ -56,7 +56,7 @@ dBgS_Acch::dBgS_Acch() {
     pm_pos = NULL;
     pm_old_pos = NULL;
     pm_speed = NULL;
-    m_ground_h = C_BG_MIN_HEIGHT;
+    m_ground_h = -G_CM3D_F_INF;
     m_ground_up_h = 0.0f;
     m_ground_check_offset = 60.0f;
     m_ground_up_h_diff = 0.0f;
@@ -73,7 +73,7 @@ dBgS_Acch::dBgS_Acch() {
     pm_shape_angle = NULL;
     m_my_ac = NULL;
     pm_out_poly_info = NULL;
-    m_sea_height = C_BG_MIN_HEIGHT;
+    m_sea_height = -G_CM3D_F_INF;
 }
 
 static void dummy1() {
@@ -108,7 +108,7 @@ void dBgS_Acch::Set(cXyz* pos, cXyz* old_pos, fopAc_ac_c* actor, int tbl_size, d
 
 /* 800A2E80-800A2EE8       .text GroundCheckInit__9dBgS_AcchFR4dBgS */
 void dBgS_Acch::GroundCheckInit(dBgS&) {
-    m_ground_h = C_BG_MIN_HEIGHT;
+    m_ground_h = -G_CM3D_F_INF;
     if (m_flags & GRND_NONE) {
         return;
     }
@@ -131,7 +131,7 @@ void dBgS_Acch::GroundCheck(dBgS& i_bgs) {
     m_gnd.m_pos = pos;
 
     m_ground_h = i_bgs.GroundCross(&m_gnd);
-    if (m_ground_h != C_BG_MIN_HEIGHT) {
+    if (m_ground_h != -G_CM3D_F_INF) {
         field_0xb8 = m_ground_h + m_ground_up_h;
         if (field_0xb8 > field_0xb4) {
             pm_pos->y = field_0xb8;
@@ -155,8 +155,8 @@ void dBgS_Acch::GroundCheck(dBgS& i_bgs) {
 
 /* 800A305C-800A313C       .text GroundRoofProc__9dBgS_AcchFR4dBgS */
 f32 dBgS_Acch::GroundRoofProc(dBgS& i_bgs) {
-    f32 y = C_BG_MIN_HEIGHT;
-    if (m_ground_h != C_BG_MIN_HEIGHT) {
+    f32 y = -G_CM3D_F_INF;
+    if (m_ground_h != -G_CM3D_F_INF) {
         // y = m_roof_height;
         // fakematch to fix load order
         if (field_0xb8 < (y = m_roof_height) && y < pm_pos->y) {
@@ -257,14 +257,14 @@ void dBgS_Acch::CrrPos(dBgS& i_bgs) {
         LineCheck(i_bgs);
     }
 
-    m_roof_height = C_BG_MAX_HEIGHT;
+    m_roof_height = G_CM3D_F_INF;
     if (!(m_flags & ROOF_NONE)) {
         m_roof.SetExtChk(*(cBgS_Chk*)this);
         ClrRoofHit();
         cXyz roofPos = *pm_pos;
         m_roof.SetPos(roofPos);
         m_roof_y = i_bgs.RoofChk(&m_roof);
-        if (m_roof_y != C_BG_MAX_HEIGHT && pm_pos->y + m_roof_crr_height > m_roof_y) {
+        if (m_roof_y != G_CM3D_F_INF && pm_pos->y + m_roof_crr_height > m_roof_y) {
             m_roof_height = m_roof_y - m_roof_crr_height;
             SetRoofHit();
         }
@@ -281,10 +281,10 @@ void dBgS_Acch::CrrPos(dBgS& i_bgs) {
     if (!(m_flags & WATER_NONE)) {
         ClrWaterHit();
         ClrWaterIn();
-        m_wtr.SetHeight(C_BG_MIN_HEIGHT);
+        m_wtr.SetHeight(-G_CM3D_F_INF);
 
         int room_no = i_bgs.GetRoomId(m_gnd);
-        if (m_ground_h != C_BG_MIN_HEIGHT && 0 <= room_no && room_no < 64) {
+        if (m_ground_h != -G_CM3D_F_INF && 0 <= room_no && room_no < 64) {
             JUT_ASSERT(693, 0 <= room_no && room_no < 64);
 
             dBgW* bgw = dComIfGp_roomControl_getBgW(room_no);
@@ -312,7 +312,7 @@ void dBgS_Acch::CrrPos(dBgS& i_bgs) {
 
     if (ChkSeaCheckOn()) {
         m_flags &= ~SEA_IN;
-        m_sea_height = C_BG_MIN_HEIGHT;
+        m_sea_height = -G_CM3D_F_INF;
 
         if (daSea_ChkArea(pm_pos->x, pm_pos->z)) {
             m_sea_height = daSea_calcWave(pm_pos->x, pm_pos->z);
diff --git a/src/d/d_bg_s_func.cpp b/src/d/d_bg_s_func.cpp
index 2bbafb2c8..4c3078ba9 100644
--- a/src/d/d_bg_s_func.cpp
+++ b/src/d/d_bg_s_func.cpp
@@ -34,7 +34,7 @@ bool dBgS_SplGrpChk_In_ObjGnd(cXyz& r30, dBgS_SplGrpChk* r31, f32 f31) {
     gndChk.SetPos(&sp1c);
     f32 height = dComIfG_Bgsp()->GroundCross(&gndChk);
     r31->SetHeight(height);
-    if (height == C_BG_MIN_HEIGHT) {
+    if (height == -G_CM3D_F_INF) {
         return FALSE;
     }
     
@@ -79,7 +79,7 @@ u32 dBgS_GetGndMtrlSndId_Func(cXyz r21, f32 f1) {
     r21.y += f1;
     dBgS_ObjGndChk gndChk;
     gndChk.SetPos(&r21);
-    if (dComIfG_Bgsp()->GroundCross(&gndChk) == C_BG_MIN_HEIGHT) {
+    if (dComIfG_Bgsp()->GroundCross(&gndChk) == -G_CM3D_F_INF) {
         return 0;
     }
     return dComIfG_Bgsp()->GetMtrlSndId(gndChk);
diff --git a/src/d/d_bg_s_spl_grp_chk.cpp b/src/d/d_bg_s_spl_grp_chk.cpp
index 59e703795..b86142927 100644
--- a/src/d/d_bg_s_spl_grp_chk.cpp
+++ b/src/d/d_bg_s_spl_grp_chk.cpp
@@ -14,7 +14,7 @@ dBgS_SplGrpChk::dBgS_SplGrpChk() {
     m_ground.x = 0.0f;
     m_ground.y = 0.0f;
     m_ground.z = 0.0f;
-    m_roof = C_BG_MAX_HEIGHT;
+    m_roof = G_CM3D_F_INF;
     m_height = 0.0f;
 }
 
diff --git a/src/d/d_bg_w_hf.cpp b/src/d/d_bg_w_hf.cpp
index 70b8c7bfc..4029a493f 100644
--- a/src/d/d_bg_w_hf.cpp
+++ b/src/d/d_bg_w_hf.cpp
@@ -153,8 +153,8 @@ void dBgWHf::MakeBlckBndHf(int blck_id, f32* r28, f32* r29) {
         r31 = pm_bgd->m_t_num - 1;
     }
     
-    *r28 = C_BG_MAX_HEIGHT;
-    *r29 = C_BG_MIN_HEIGHT;
+    *r28 = G_CM3D_F_INF;
+    *r29 = -G_CM3D_F_INF;
     
     for (int t = r7; t <= r31; t++) {
 #if VERSION > VERSION_JPN
diff --git a/src/d/d_camera.cpp b/src/d/d_camera.cpp
index 85a5ac242..8e2e3d816 100644
--- a/src/d/d_camera.cpp
+++ b/src/d/d_camera.cpp
@@ -269,9 +269,9 @@ void dCamera_c::initialize(camera_class* camera, fopAc_ac_c* playerActor, u32 ca
     mEventData.mStaffIdx = -1;
     mEventData.field_0x0c = -1;
     mRoomNo = -1;
-    m318 = C_BG_MIN_HEIGHT;
-    mBG.m5C.m58 = C_BG_MIN_HEIGHT;
-    mBG.m00.m58 = C_BG_MIN_HEIGHT;
+    m318 = -G_CM3D_F_INF;
+    mBG.m5C.m58 = -G_CM3D_F_INF;
+    mBG.m00.m58 = -G_CM3D_F_INF;
     mBG.m00.m04.OffNormalGrp();
     mBG.m00.m04.OnWaterGrp();
     m31D = 0;
@@ -284,7 +284,7 @@ void dCamera_c::initialize(camera_class* camera, fopAc_ac_c* playerActor, u32 ca
     m350 = 0;
     m364 = 0;
     m368 = 0.0f;
-    m354 = C_BG_MIN_HEIGHT;
+    m354 = -G_CM3D_F_INF;
     mRoomMapToolCameraIdx = 0xFF;
     m608 = mCamSetup.mBGChk.WallUpDistance();
 
@@ -1814,7 +1814,7 @@ f32 dCamera_c::groundHeight(cXyz* param_0) {
         wtr_y = gnd_y;
     }
 
-    if (wtr_y == C_BG_MIN_HEIGHT) {
+    if (wtr_y == -G_CM3D_F_INF) {
         gnd_y = param_0->y;
     }
     else {
@@ -2501,13 +2501,13 @@ void dCamera_c::checkGroundInfo() {
         mBG.m5C.m04 = gnd_chk;
     }
 
-    mBG.m5C.m00 = mBG.m5C.m58 != C_BG_MIN_HEIGHT;
+    mBG.m5C.m00 = mBG.m5C.m58 != -G_CM3D_F_INF;
     
     mBG.m00.m04.SetPos(&gnd_chk_pos);
 
     mBG.m00.m58 = dComIfG_Bgsp()->GroundCross(&mBG.m00.m04);
 
-    mBG.m00.m00 = mBG.m00.m58 != C_BG_MIN_HEIGHT;
+    mBG.m00.m00 = mBG.m00.m58 != -G_CM3D_F_INF;
 
     m354 = mBG.m00.m58;
     if (mpPlayerActor->current.pos.y - mBG.m5C.m58 > mCamSetup.mBGChk.FloorMargin()) {
@@ -2588,7 +2588,7 @@ void dCamera_c::checkGroundInfo() {
         m314 = 1;
     }
     else {
-        m318 = C_BG_MIN_HEIGHT;
+        m318 = -G_CM3D_F_INF;
         m314 = 0;
     }
     
@@ -4749,7 +4749,7 @@ bool camera_draw(camera_process_class* i_this) {
     gndchk.SetPos(&i_this->mLookat.mEye);
 
     f32 ground_y = dComIfG_Bgsp()->GroundCross(&gndchk);
-    if (ground_y != C_BG_MIN_HEIGHT) {
+    if (ground_y != -G_CM3D_F_INF) {
         mDoAud_getCameraMapInfo(dComIfG_Bgsp()->GetMtrlSndId(gndchk));
         mDoAud_setCameraGroupInfo(dComIfG_Bgsp()->GetGrpSoundId(gndchk));
 
diff --git a/src/d/d_cc_mass_s.cpp b/src/d/d_cc_mass_s.cpp
index 3b2005bf1..4ae8ac42c 100644
--- a/src/d/d_cc_mass_s.cpp
+++ b/src/d/d_cc_mass_s.cpp
@@ -20,10 +20,10 @@ void dCcMassS_Mng::Ct() {
     mFlag = 0;
     mResultCam = 0;
     mCamTopPos.x = 0.0f;
-    mCamTopPos.y = C_BG_MIN_HEIGHT;
+    mCamTopPos.y = -G_CM3D_F_INF;
     mCamTopPos.z = 0.0f;
     mCamBottomPos.x = 0.0f;
-    mCamBottomPos.y = C_BG_MIN_HEIGHT;
+    mCamBottomPos.y = -G_CM3D_F_INF;
     mCamBottomPos.z = 0.0f;
     Clear();
 }
@@ -71,13 +71,13 @@ void dCcMassS_Mng::Prepare() {
         mDivideArea.CalcDivideInfo(&mDivideInfo, mCpsAttr.GetWorkAab(), 0);
     }
     mCamTopPos.x = 0.0f;
-    mCamTopPos.y = C_BG_MIN_HEIGHT;
+    mCamTopPos.y = -G_CM3D_F_INF;
     mCamTopPos.z = 0.0f;
-    mCamTopDist = C_BG_MAX_HEIGHT;
+    mCamTopDist = G_CM3D_F_INF;
     mCamBottomPos.x = 0.0f;
-    mCamBottomPos.y = C_BG_MIN_HEIGHT;
+    mCamBottomPos.y = -G_CM3D_F_INF;
     mCamBottomPos.z = 0.0f;
-    mCamBottomDist = C_BG_MAX_HEIGHT;
+    mCamBottomDist = G_CM3D_F_INF;
 }
 
 /* 800ACCB8-800AD17C       .text Chk__12dCcMassS_MngFP4cXyzPP10fopAc_ac_cP15dCcMassS_HitInf */
diff --git a/src/d/d_com_inf_game.cpp b/src/d/d_com_inf_game.cpp
index 737dda2af..6a748aa18 100644
--- a/src/d/d_com_inf_game.cpp
+++ b/src/d/d_com_inf_game.cpp
@@ -562,7 +562,7 @@ s8 dComIfGp_getReverb(int param_0) {
 /* 800534C4-800535B8       .text dComIfGd_setSimpleShadow2__FP4cXyzffR13cBgS_PolyInfosfP9_GXTexObj */
 int dComIfGd_setSimpleShadow2(cXyz* i_pos, f32 groundY, f32 param_2, cBgS_PolyInfo& i_floorPoly,
                               s16 i_angle, f32 param_5, GXTexObj* i_tex) {
-    if (i_floorPoly.ChkSetInfo() && C_BG_MIN_HEIGHT != groundY) {
+    if (i_floorPoly.ChkSetInfo() && -G_CM3D_F_INF != groundY) {
         cM3dGPla* plane_p =
             dComIfG_Bgsp()->GetTriPla(i_floorPoly);
 
@@ -1041,7 +1041,7 @@ u8 dComIfGs_checkGetItemNum(u8 i_itemNo) {
 int dComIfGd_setShadow(u32 id, s8 param_2, J3DModel* pModel, cXyz* pPos, f32 param_5, f32 param_6,
                        f32 y, f32 groundY, cBgS_PolyInfo& pFloorPoly, dKy_tevstr_c* param_10,
                        s16 rotY, f32 param_12, GXTexObj* pTexObj) {
-    if (groundY <= C_BG_MIN_HEIGHT) {
+    if (groundY <= -G_CM3D_F_INF) {
         return 0;
     }
 
diff --git a/src/d/d_grass.cpp b/src/d/d_grass.cpp
index ea321a38f..e70904deb 100644
--- a/src/d/d_grass.cpp
+++ b/src/d/d_grass.cpp
@@ -444,7 +444,7 @@ static f32 checkGroundY(cXyz& pos) {
     chk.SetPos(&pos);
     f32 y = dComIfG_Bgsp()->GroundCross(&chk);
     pos.y -= 50.0f;
-    if (y <= C_BG_MIN_HEIGHT)
+    if (y <= -G_CM3D_F_INF)
         return pos.y;
     else
         return y;
diff --git a/src/d/d_kankyo_rain.cpp b/src/d/d_kankyo_rain.cpp
index 56fb25e20..84f52469a 100644
--- a/src/d/d_kankyo_rain.cpp
+++ b/src/d/d_kankyo_rain.cpp
@@ -726,7 +726,7 @@ bool overhead_bg_chk() {
     pos.y += 50.0f;
     roofChk.SetPos(pos);
 
-    if (dComIfG_Bgsp()->RoofChk(&roofChk) != C_BG_MAX_HEIGHT)
+    if (dComIfG_Bgsp()->RoofChk(&roofChk) != G_CM3D_F_INF)
         ret = true;
     pos.y += 10000.0f;
     gndChk.SetPos(&pos);
@@ -755,7 +755,7 @@ bool forward_overhead_bg_chk(cXyz* pPos, f32 dist) {
     *pPos = pos;
     roofChk.SetPos(pos);
 
-    if (dComIfG_Bgsp()->RoofChk(&roofChk) != C_BG_MAX_HEIGHT)
+    if (dComIfG_Bgsp()->RoofChk(&roofChk) != G_CM3D_F_INF)
         ret = true;
     pos.y += 10000.0f;
     gndChk.SetPos(&pos);
diff --git a/src/d/d_lib.cpp b/src/d/d_lib.cpp
index c34e5c5b6..da322377c 100644
--- a/src/d/d_lib.cpp
+++ b/src/d/d_lib.cpp
@@ -27,7 +27,7 @@ void dLib_setCirclePath(dLib_circle_path_c* path) {
 /* 800570CC-8005716C       .text dLib_getWaterY__FR4cXyzR12dBgS_ObjAcch */
 f32 dLib_getWaterY(cXyz& pos, dBgS_ObjAcch& acch) {
     BOOL waterHit = acch.ChkWaterHit();
-    f32 waterHeight = waterHit ? acch.m_wtr.GetHeight() : C_BG_MIN_HEIGHT;
+    f32 waterHeight = waterHit ? acch.m_wtr.GetHeight() : -G_CM3D_F_INF;
     if (daSea_ChkArea(pos.x, pos.z)) {
         f32 seaHeight = daSea_calcWave(pos.x, pos.z);
         if (!waterHit || seaHeight > waterHeight) {
diff --git a/src/d/d_particle.cpp b/src/d/d_particle.cpp
index 853bbcc06..e48d067a9 100644
--- a/src/d/d_particle.cpp
+++ b/src/d/d_particle.cpp
@@ -766,7 +766,7 @@ JPABaseEmitter* dPa_control_c::setSimpleLand(int code, const cXyz* pos, const cs
         dBgS_ObjGndChk chk;
         cXyz chkPos(pos->x, pos->y + 10.0f, pos->z);
         chk.SetPos(&chkPos);
-        if (dComIfG_Bgsp()->GroundCross(&chk) != C_BG_MIN_HEIGHT) {
+        if (dComIfG_Bgsp()->GroundCross(&chk) != -G_CM3D_F_INF) {
             code = dComIfG_Bgsp()->GetAttributeCode(chk);
         }
     }
diff --git a/src/d/d_wood.cpp b/src/d/d_wood.cpp
index b9e771687..f80b62c92 100644
--- a/src/d/d_wood.cpp
+++ b/src/d/d_wood.cpp
@@ -603,7 +603,7 @@ bool dWood::Unit_c::set_ground() {
     gndChk.SetPos(&pos);
     f32 gndHeight = dComIfG_Bgsp()->GroundCross(&gndChk);
 
-    if (gndHeight > C_BG_MIN_HEIGHT) {
+    if (gndHeight > -G_CM3D_F_INF) {
         mPos.y = gndHeight;
         cM3dGPla *triPla = dComIfG_Bgsp()->GetTriPla(gndChk);
 
diff --git a/src/d/d_wpot_water.cpp b/src/d/d_wpot_water.cpp
index 76a90a998..2384fa713 100644
--- a/src/d/d_wpot_water.cpp
+++ b/src/d/d_wpot_water.cpp
@@ -90,7 +90,7 @@ static cPhs_State dWpotWater_Create(kankyo_class* i_k) {
         );
         lavaChk.SetPos(&pos);
         f32 lavaY = dComIfG_Bgsp()->GroundCross(&lavaChk);
-        if (lavaY != C_BG_MIN_HEIGHT) {
+        if (lavaY != -G_CM3D_F_INF) {
             gndChk.SetPos(&pos);
             f32 groundY = dComIfG_Bgsp()->GroundCross(&gndChk);
             if (lavaChk.ChkSetInfo() && dComIfG_Bgsp()->GetAttributeCode(lavaChk) == dBgS_Attr_LAVA_e && lavaY > groundY) {
@@ -109,7 +109,7 @@ static cPhs_State dWpotWater_Create(kankyo_class* i_k) {
     gndChk.SetPos(&pos);
     f32 groundY = dComIfG_Bgsp()->GroundCross(&gndChk);
     i_this->mPos.y = groundY;
-    if (groundY != C_BG_MIN_HEIGHT) {
+    if (groundY != -G_CM3D_F_INF) {
         cXyz sp18(i_this->mPos.x, i_this->mPos.y, i_this->mPos.z);
         fopAcM_create(PROC_HITOBJ, 0, &sp18, i_this->mParam);
         return i_this->create();
diff --git a/src/f_op/f_op_actor_mng.cpp b/src/f_op/f_op_actor_mng.cpp
index 1aea40fa4..c4ed54183 100644
--- a/src/f_op/f_op_actor_mng.cpp
+++ b/src/f_op/f_op_actor_mng.cpp
@@ -1293,13 +1293,13 @@ BOOL fopAcM_getGroundAngle(fopAc_ac_c* actor, csXyz* p_angle) {
     pos.y = dComIfG_Bgsp()->GroundCross(&gndChk);
     s16 targetAngleX;
     int targetAngleZ;
-    if (pos.y != C_BG_MIN_HEIGHT) {
+    if (pos.y != -G_CM3D_F_INF) {
         f32 origY = pos.y + 50.0f;
         gndChk.GetPointP()->set(pos.x, origY, pos.z + 10.0f);
         f32 origX = gndChk.GetPointP()->x;
         f32 origZ = gndChk.GetPointP()->z;
         f32 groundY = dComIfG_Bgsp()->GroundCross(&gndChk);
-        if (groundY != C_BG_MIN_HEIGHT) {
+        if (groundY != -G_CM3D_F_INF) {
             targetAngleX = -cM_atan2s(groundY - pos.y, origZ - pos.z);
         } else {
             pos.y = pos.y; // ?? fakematch?
@@ -1311,7 +1311,7 @@ BOOL fopAcM_getGroundAngle(fopAc_ac_c* actor, csXyz* p_angle) {
         f32 tempZ = pos.z;
         gndChk.GetPointP()->set(origX, origY, tempZ);
         groundY = dComIfG_Bgsp()->GroundCross(&gndChk);
-        if (groundY != C_BG_MIN_HEIGHT) {
+        if (groundY != -G_CM3D_F_INF) {
             targetAngleZ = cM_atan2s(groundY - pos.y, origX - pos.x);
         } else {
             ret = FALSE;
@@ -1412,7 +1412,7 @@ BOOL fopAcM_getWaterY(const cXyz* pPos, f32* pDstWaterY) {
     static dBgS_WtrChk water_check;
     BOOL ret = FALSE;
 
-    *pDstWaterY = C_BG_MIN_HEIGHT;
+    *pDstWaterY = -G_CM3D_F_INF;
 
     cXyz pos;
     pos.x = pPos->x;