opengl fix

shaders/lighting/directional/fragment.sc

@@ -89,7 +89,7 @@ void main()
     vec3 V = normalize(uniformCameraPosition.xyz - wpos);
 
     vec3 F0 = vec3(0.04, 0.04, 0.04); 
-    F0 = mix(F0, colour, metallic);
+    F0 = mix(F0, colour.xyz, metallic);
         
     vec3 L = lightDir;
     vec3 H = normalize(V + L);
@@ -110,5 +110,5 @@ void main()
     // add to outgoing radiance Lo
     float NdotL = max(dot(normal.xyz, L), 0.0);                
 
-    gl_FragColor = vec4(((kD * colour / PI + specular) * lightColour * NdotL), colour.w); 
+    gl_FragColor = vec4(((kD * colour.xyz / PI + specular) * lightColour * NdotL), colour.w); 
 }