PBR, fixed the way metallic material base color was handled for indirect lighting.

Also calibrated roughness so that it matches Substance painter renderer.

jme3-core/src/main/resources/Common/MatDefs/Light/PBRLighting.frag

@@ -1,5 +1,5 @@
 #import "Common/ShaderLib/Parallax.glsllib"
-#import "Common/ShaderLib/PBR.glsllib"
+#import "ShaderLib/PBR.glsllib"
 #import "Common/ShaderLib/Lighting.glsllib"
 
 varying vec2 texCoord;
@@ -111,14 +111,14 @@ void main(){
         vec4 albedo = Color;
     #endif
     #ifdef ROUGHNESSMAP
-        float Roughness = texture2D(m_RoughnessMap, newTexCoord).r * max(m_Roughness,1e-8);
+        float Roughness = texture2D(m_RoughnessMap, newTexCoord).r * max(m_Roughness, 1e-8);
     #else
-        float Roughness =  max(m_Roughness,1e-8);
+        float Roughness =  max(m_Roughness, 1e-8);
     #endif
     #ifdef METALLICMAP   
         float Metallic = texture2D(m_MetallicMap, newTexCoord).r;
     #else
-        float Metallic =  max(m_Metallic,0.00);
+        float Metallic =  max(m_Metallic, 0.0);
     #endif
  
     float alpha = Color.a * albedo.a;
@@ -214,7 +214,7 @@ void main(){
 
     vec3 indirectDiffuse = vec3(0.0);
     vec3 indirectSpecular = vec3(0.0);    
-    indirectDiffuse = textureCube(g_IrradianceMap, rv.xyz).rgb * albedo.rgb;
+    indirectDiffuse = textureCube(g_IrradianceMap, rv.xyz).rgb * diffuseColor.rgb;
 
     indirectSpecular = ApproximateSpecularIBLPolynomial(g_PrefEnvMap, specularColor.rgb, Roughness, ndotv, rv.xyz);
     indirectSpecular *= vec3(horiz);
@@ -234,4 +234,5 @@ void main(){
            
     gl_FragColor.a = alpha;
     
+   
 }

jme3-core/src/main/resources/Common/ShaderLib/PBR.glsllib

@@ -134,7 +134,7 @@ vec3 EnvDFGPolynomial( vec3 specularColor, float roughness, float ndotv ){
 
 vec3 ApproximateSpecularIBL(samplerCube envMap,sampler2D integrateBRDF, vec3 SpecularColor , float Roughness, float ndotv, vec3 refVec){
     //TODO magic values should be replaced by defines.
-    float Lod = log2(Roughness) * 1.2 + 6.0 - 1.0;
+    float Lod = log2(Roughness) * 1.5 + 6.0 - 1.0;
     vec3 PrefilteredColor =  textureCubeLod(envMap, refVec.xyz,Lod).rgb;
     vec2 EnvBRDF = texture2D(integrateBRDF,vec2(Roughness, ndotv)).rg;
     return PrefilteredColor * ( SpecularColor * EnvBRDF.x+ EnvBRDF.y );    
@@ -142,7 +142,7 @@ vec3 ApproximateSpecularIBL(samplerCube envMap,sampler2D integrateBRDF, vec3 Spe
 
 vec3 ApproximateSpecularIBLPolynomial(samplerCube envMap, vec3 SpecularColor , float Roughness, float ndotv, vec3 refVec){
     //TODO magic values should be replaced by defines.
-    float Lod = log2(Roughness) * 1.2 + 6.0 - 1.0;
+    float Lod = log2(Roughness) * 1.5 + 6.0 - 1.0;
     vec3 PrefilteredColor =  textureCubeLod(envMap, refVec.xyz,Lod).rgb;    
     return PrefilteredColor * EnvDFGPolynomial(SpecularColor, Roughness, ndotv);
 }