remember to fix normals to [-1, 1]

res/shaders/simple.frag

@@ -45,7 +45,7 @@ float dither(vec2 uv) {
 void main()
 {
     // only sample normals for normal mapped geometry
-    vec3 normal = bool(normalMapped) ? vec3(texture(normalSampler, textureCoordinates)) : normal_in;
+    vec3 normal = bool(normalMapped) ? 2*vec3(texture(normalSampler, textureCoordinates))-1 : normal_in;
 
     vec3 N = normalize(normal);
     vec3 V = normalize(cameraPosition - worldPosition);