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Fix completely black WMO areas caused by zero vertex colors

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The issue was that vertex colors (MOCV) were being multiplied directly into
the texture color BEFORE lighting calculation. When MOCV data contained
black (0,0,0) values, this zeroed out the texture color, making all
subsequent lighting multiplication also zero, resulting in pitch black areas
regardless of ambient light settings.

Fixed by:
1. Removed premature vertex color multiplication from texture sampling
2. Applied vertex colors as ambient occlusion AFTER lighting calculation
3. Clamped vertex colors to minimum 0.5 to prevent complete blackout

Now even areas with black MOCV data will render at 50% brightness minimum,
while properly lit areas remain bright. This preserves the AO effect without
causing invisible geometry.
This commit is contained in:
Kelsi 2026-02-09 18:13:05 -08:00
parent 3f7da35fb8
commit 9ebfc9b21f
1 changed files with 7 additions and 5 deletions
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12
src/rendering/wmo_renderer.cpp
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@ -110,11 +110,8 @@ bool WMORenderer::initialize(pipeline::AssetManager* assets) {
// Alpha test only for cutout materials (lattice, grating, etc.)
if (uAlphaTest && texColor.a < 0.5) discard;
alpha = texColor.a;
// Exterior: multiply vertex color (MOCV baked AO) into texture
// Interior: keep texture clean — vertex color is used as light below
if (!uIsInterior) {
texColor.rgb *= VertexColor.rgb;
}
// Don't multiply texture by vertex color here - it zeros out black MOCV areas
// Vertex colors will be applied as AO modulation after lighting
} else {
// MOCV vertex color alpha is a lighting blend factor, not transparency
texColor = vec4(VertexColor.rgb, 1.0);
@ -177,6 +174,11 @@ bool WMORenderer::initialize(pipeline::AssetManager* assets) {
shadow = mix(1.0, shadow, clamp(uShadowStrength, 0.0, 1.0));
litColor = (ambient + (diffuse + specular) * shadow) * texColor.rgb;
// Apply vertex color as ambient occlusion (AO) with minimum to prevent blackout
// MOCV values of (0,0,0) are clamped to 0.5 to keep areas visible
vec3 ao = max(VertexColor.rgb, vec3(0.5));
litColor *= ao;
}
// Fog