A few minor changes

data/shaders/IBL.frag

@@ -142,6 +142,9 @@ void main(void)
     int x = int(gl_FragCoord.x), y = int(gl_FragCoord.y);
     vec3 FragPos = getXcYcZc(x, y, lineardepth);
 
+    // Fallback
+    vec3 fallback = .25 * SpecularIBL(normal, eyedir, specval);
+
     // Better implementation: :::::::::::::::::::::::::::::::::::
 
     float View_Depth            = makeLinear(1000.0, 0.001, lineardepth);
@@ -161,8 +164,7 @@ void main(void)
     vec3 hitPos                 = View_Pos.xyz;
     float dDepth;
     float minRayStep            = 100.0f;
-    // Fallback
-    vec3 fallback = .25 * SpecularIBL(normal, eyedir, specval);
+    
     vec3 outColor = RayCast(reflected * max(minRayStep, -View_Pos.z), hitPos, dDepth, dtex, fallback, 0.001);
     vec3 outColor2 = RayCast(reflected2 * max(minRayStep, -View_Pos.z), hitPos, dDepth, dtex, fallback, 0.001);
     outColor = mix(outColor, outColor2, 1.0 - specval);

data/shaders/combine_diffuse_color.frag

@@ -28,7 +28,7 @@ void main()
     vec3 SpecularComponent = texture(specular_map, tc).xyz;
 
     vec3 diffuse_color_for_mix = diffuseMatColor.xyz * 4.0;
-    vec3 metallicMatColor = mix(vec3(0.2), diffuse_color_for_mix, metallicMapValue);
+    vec3 metallicMatColor = mix(vec3(0.5), diffuse_color_for_mix, metallicMapValue);
     vec3 tmp = DiffuseComponent * mix(diffuseMatColor.xyz, vec3(0.0), metallicMapValue) + (metallicMatColor * SpecularComponent);
 
     vec3 emitCol = diffuseMatColor.xyz + (diffuseMatColor.xyz * diffuseMatColor.xyz * emitMapValue * emitMapValue * 10.0);

data/shaders/sp_solid.frag

@@ -39,7 +39,7 @@ void main(void)
 
     o_normal_color.xy = 0.5 * EncodeNormal(normalize(normal)) + 0.5;
     o_normal_color.zw = layer_2.xy;
-    //o_normal_color.z = 0;
+    o_normal_color.z = 0.5;
 #else
     o_diffuse_color = vec4(final_color, 1.0);
 #endif