calculateLight method

void calculateLight(List<Light> lights, Vector3 position, Vector3 normal, Color color,)

Implementation

void calculateLight(List<Light> lights,Vector3 position,Vector3 normal,Color color){
  for(int l = 0; l < lights.length; l ++ ) {
    Light light = lights[l];
    Color lightColor = light.color ?? Color();

    if(light is DirectionalLight){
      Vector3 lightPosition = _vector3.setFromMatrixPosition( light.matrixWorld ).normalize();

      num amount = normal.dot( lightPosition );
      if ( amount <= 0 ) continue;
      amount *= light.intensity;
      color.red += lightColor.red * amount;
      color.green += lightColor.green * amount;
      color.blue += lightColor.blue * amount;
    }
    else if (light is PointLight){
      Vector3 lightPosition = _vector3.setFromMatrixPosition( light.matrixWorld );

      num amount = normal.dot( _vector3.sub2( lightPosition, position ).normalize() );
      if ( amount <= 0 ) continue;
      amount *= light.distance == 0 ? 1 : 1 - math.min( position.distanceTo( lightPosition ) / light.distance!, 1 );
      if ( amount == 0 ) continue;
      amount *= light.intensity;
      color.red += lightColor.red * amount;
      color.green += lightColor.green * amount;
      color.blue += lightColor.blue * amount;
    }
  }
}