docs: @Override
  	public void setEquirectangularShape( int width , int height ) {
  		super.setEquirectangularShape(width, height);
  		declareVectors(width, height);
  
  		// precompute vectors for each pixel
  		for (int y = 0; y < height; y++) {
  			for (int x = 0; x < width; x++) {
  				tools.equiToNormFV(x,y,vectors[y*width+x]);
  			}
  		}
  	}