message: fix fog, uncommented shader macro
diff: -// #ifdef dUseFog
  +#ifdef dUseFog
  float depth = length(vViewPosition);
  // float depth = gl_FragCoord.z / gl_FragCoord.w;
  float fogFactor = smoothstep(uFogNear, uFogFar, depth);
  gl_FragColor.rgb = mix(gl_FragColor.rgb, uFogColor, fogFactor);
  -// #endif
  \ No newline at end of file
  +#endif
  \ No newline at end of file
  