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Use more accurate light formula for transparency

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RaveYard 2023-09-22 14:40:35 +02:00 committed by Christoph Oelckers
parent 99daa8f743
commit 5987b537c5
1 changed files with 10 additions and 3 deletions
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13
wadsrc/static/shaders/lightmap/frag_raytrace.glsl
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@ -512,9 +512,16 @@ vec4 alphaBlend(vec4 a, vec4 b)
return vec4((a.xyz * a.w + b.xyz * b.w * (1.0 - a.w)) / na, max(0.001, na));
}
vec4 BeerLambertSimple(vec4 medium, vec4 ray_color) // based on Beer-Lambert law
{
float z = medium.w;
ray_color.rgb *= exp(-medium.rgb * vec3(z));
return ray_color;
}
vec4 blend(vec4 a, vec4 b)
{
return alphaBlend(a, b);
return BeerLambertSimple(vec4(1.0 - a.rgb, a.w), b);
}
int TraceFirstHitTriangleT(vec3 origin, float tmin, vec3 dir, float tmax, out float t)
@ -550,7 +557,7 @@ int TraceFirstHitTriangleT(vec3 origin, float tmin, vec3 dir, float tmax, out fl
break;
}
rayColor = blend(color, rayColor) * (1.0 - color.w);
rayColor = blend(color, rayColor);
#else
break;
#endif
@ -616,7 +623,7 @@ bool TracePoint(vec3 origin, vec3 target, float tmin, vec3 dir, float tmax)
break;
}
rayColor = blend(color, rayColor) * (1.0 - color.w);
rayColor = blend(color, rayColor);
#else
rayColor.w = 0; // I suspect some rays are escaping out of bounds
break;