anchor.diff:      matPerlin.ForceUniform(uTime, timeMs / 1000.0);
       programTexture.Draw(torus, [perspective, matTexture]);
       programPerlin.Draw(torus, [perspective, matPerlin]);
  -  progStars.Draw(mdStars, [matStars, perspective]);
  +    progStars.Draw(mdStars, [matStars, perspective]);
   
       HTML.window.animationFrame.then(animate);
       fps.UpdateFrameCount(_lastTimeMs);
  
positive.code:     ..SetUniform(uColor, new VM.Vector3.zero());
  
    final Material matPerlin = new Material("perlin")
      ..SetUniform(uModelMatrix,
          new VM.Matrix4.identity()..setTranslationRaw(50.0, 0.0, 0.0));
  
  
negative.code: import "dart:async";
  
  String textureFile = "../gradient.jpg";
  
  void main() {
    StatsFps fps =
  