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Added small metal detection hack for new PBR shader

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This commit is contained in:
Robert Beckebans 2024-11-29 17:44:20 +01:00
parent f3fd486c60
commit 78bebe99ee
1 changed files with 11 additions and 1 deletions
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12
neo/shaders/BRDF.inc.hlsl
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@ -124,7 +124,8 @@ float EstimateLegacyRoughness( float3 specMapSRGB )
void PBRFromSpecmap( float3 specMap, out float3 F0, out float roughness )
{
// desaturate specular
float specLum = max( specMap.r, max( specMap.g, specMap.b ) );
//float specLum = max( specMap.r, max( specMap.g, specMap.b ) );
float specLum = dot( LUMINANCE_SRGB.rgb, specMap );
// fresnel base
F0 = _float3( 0.04 );
@ -146,6 +147,15 @@ void PBRFromSpecmap( float3 specMap, out float3 F0, out float roughness )
// specular power to roughness
roughness = sqrt( 2.0 / ( specPow + 2.0 ) );
#if 1
// RB: try to distinct between dielectrics and metal materials
float glossiness = saturate( 1.0 - roughness );
float metallic = step( 0.7, glossiness );
float3 glossColor = Linear3( specMap.rgb );
F0 = lerp( F0, glossColor, metallic );
#endif
// RB: do another sqrt because PBR shader squares it
roughness = sqrt( roughness );
}