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psxrecomp/docs/PROJECTION_SCALE.md

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Optional projection-distance scaling

[video] fov_scale accepts finite values greater than zero and at most 8; 1.0 is faithful. A valid PSX_GTE_FOV_SCALE overrides the config value; invalid environment values are ignored. The whole string must be numeric apart from surrounding whitespace. Scaling is quantized to 0.001, with a minimum quantized denominator of 1. Values above one reduce effective H. This scales projection distance, not the field-of-view angle. Guest H storage is unchanged; RTPS/RTPT and their optional precision shadows use effective H.

The setting is loaded by a runtime-only parser extension. It does not change the shared recompiler parser, emitted BIOS/game C or emitter fingerprints. Consuming it requires updating the framework pin and rebuilding the runtime; neither game nor BIOS regeneration is required. Bundled OpenBIOS is supported.