I have several point clouds, which originated its .LAS files, and were produced in Cesium Ion. I want to do simple visualizations based on the height of points. For example a simple threshold slider, with points above threshold appearing orange, and point below appearing green. I use:
conditions = [
[\${POSITION[2]} > ${threshold}, ‘color(“orange”)’],
[‘true’, ‘color(“green”)’]
];
Some points remain Gray. That is, apparently they do not appear to have POSITION, yet the points have a clear x,y,z location in gray. How do I access the height values?
Some data sets, when zooming in closer to cause a different LOD point tiles to load, causes the apparent color of a point cloud object to change colors. Is the ${POSITION[2]} which is used to color the points would seem to be relative to the tile offset? How best to reference the height of points in a point cloud from Cesium JS?
Oh the Joy!! → Height is sqrt(POSITION_ABSOLUTE[0]^2 + POSITION_ABSOLUTE[1]^2 + POSITION_ABSOLUTE[2]^2). → Distance from the center of the earth.