Hi Cesium Team!
I am currently working with the PointAppearences on Point Clouds.
For visualization puroses, my goal is to colorize the points in the shader according to their height with the ground as a reference.
I can't use the 'position' attribute directly, because in its coordinate system there is no 'up-axis' (i.e., I can't just map the y-value on the green colour. It all seems rotated).
Can you give me a hint how to get the up-vector, according to the earth's center?
Or do I have to store the height for every point in the point cloud data, and then retrieve it as an attribute?