From 66c5cb1daebd39db7a09a1ac5d89f1b1496cc2f4 Mon Sep 17 00:00:00 2001
From: Irastris <irastris15@gmail.com>
Date: Sun, 17 May 2026 22:09:04 -0400
Subject: [PATCH] Fix interpolation for Shadow Beast & Twilight Vermin hair
 (#1575)

* Fix interpolation for Shadow Beast hair

* Fix interpolation for Twilight Vermin hair
---
 src/d/actor/d_a_e_s1.cpp | 7 +++++++
 src/d/actor/d_a_e_yg.cpp | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/d/actor/d_a_e_s1.cpp b/src/d/actor/d_a_e_s1.cpp
index a5a05fce20..31973fc317 100644
--- a/src/d/actor/d_a_e_s1.cpp
+++ b/src/d/actor/d_a_e_s1.cpp
@@ -117,6 +117,13 @@ static void daE_S1_interp_callback(bool isSimFrame, void* pUserWork) {
             dst[i] = p0 + (p1 - p0) * alpha;
         }
     }
+    GXColor line_color;
+    line_color.r = JREG_S(0) + 5;
+    line_color.g = JREG_S(1) + 10;
+    line_color.b = JREG_S(2) + 10;
+    line_color.a = 0xFF;
+
+    i_this->mLineMat.update(16, line_color, &i_this->tevStr);
 }
 #endif
 
diff --git a/src/d/actor/d_a_e_yg.cpp b/src/d/actor/d_a_e_yg.cpp
index 44a8aee249..7fa35bdf08 100644
--- a/src/d/actor/d_a_e_yg.cpp
+++ b/src/d/actor/d_a_e_yg.cpp
@@ -139,6 +139,7 @@ static BOOL pl_check(e_yg_class* i_this, f32 i_dist) {
 #if TARGET_PC
 static void daE_YG_interp_callback(bool isSimFrame, void* pUserWork) {
     e_yg_class* i_this = (e_yg_class*)pUserWork;
+    fopAc_ac_c* actor = (fopAc_ac_c*)&i_this->actor;
     if (!i_this->mTentacleInterpPrevValid || !i_this->mTentacleInterpCurrValid) {
         return;
     }
@@ -152,6 +153,13 @@ static void daE_YG_interp_callback(bool isSimFrame, void* pUserWork) {
             dst[i] = p0 + (p1 - p0) * alpha;
         }
     }
+    GXColor color;
+    color.r = JREG_S(0) + 20;
+    color.g = JREG_S(1) + 20;
+    color.b = JREG_S(2) + 20;
+    color.a = 0xFF;
+
+    i_this->mLineMat.update(10, color, &actor->tevStr);
 }
 #endif