clamp factor entriely for getXXXLight calcs, and take metalness into account for reducing direct light diffusion imact (while this seems to make it match the tooling, I can't say I've seen this exact approach used, so might want to re-review the methodology)

Templates/BaseGame/game/core/rendering/shaders/gl/lighting.glsl

@@ -229,14 +229,14 @@ vec3 evaluateStandardBRDF(Surface surface, SurfaceToLight surfaceToLight)
 
 vec3 getDirectionalLight(Surface surface, SurfaceToLight surfaceToLight, vec3 lightColor, float lightIntensity, float shadow)
 {
-   vec3 factor = lightColor * max(surfaceToLight.NdotL, 0.0f) * shadow * lightIntensity;
+   vec3 factor = lightColor * max(surfaceToLight.NdotL * shadow * lightIntensity*(1.0-surface.metalness), 0.0f);
    return evaluateStandardBRDF(surface,surfaceToLight) * factor;
 }
 
 vec3 getPunctualLight(Surface surface, SurfaceToLight surfaceToLight, vec3 lightColor, float lightIntensity, float radius, float shadow)
 {
    float attenuation = getDistanceAtt(surfaceToLight.Lu, radius);
-   vec3 factor = lightColor * max(surfaceToLight.NdotL, 0.0f) * shadow * lightIntensity * attenuation;
+   vec3 factor = lightColor * max(surfaceToLight.NdotL * shadow * lightIntensity * attenuation*(1.0-surface.metalness), 0.0f);
    return evaluateStandardBRDF(surface,surfaceToLight) * factor;
 }
 

Templates/BaseGame/game/core/rendering/shaders/lighting.hlsl

@@ -230,14 +230,14 @@ float3 evaluateStandardBRDF(Surface surface, SurfaceToLight surfaceToLight)
 
 float3 getDirectionalLight(Surface surface, SurfaceToLight surfaceToLight, float3 lightColor, float lightIntensity, float shadow)
 {
-   float3 factor = lightColor * max(surfaceToLight.NdotL, 0.0f) * shadow * lightIntensity;
+   float3 factor = lightColor * max(surfaceToLight.NdotL* shadow * lightIntensity*(1.0-surface.metalness), 0.0f) ;
    return evaluateStandardBRDF(surface,surfaceToLight) * factor;
 }
 
 float3 getPunctualLight(Surface surface, SurfaceToLight surfaceToLight, float3 lightColor, float lightIntensity, float radius, float shadow)
 {
    float attenuation = getDistanceAtt(surfaceToLight.Lu, radius);
-   float3 factor = lightColor * max(surfaceToLight.NdotL, 0.0f) * shadow * lightIntensity * attenuation;
+   float3 factor = lightColor * max(surfaceToLight.NdotL* shadow * lightIntensity * attenuation*(1.0-surface.metalness), 0.0f) ;
    return evaluateStandardBRDF(surface,surfaceToLight) * factor;
 }