Your problem is well known.
In addition it is useful to know the visible positions on a heightfield in
front of the camera.
My personal solution is to create a scene with a orthographic camera above
the heightfield and to put a light instead of the scene camera. I managed
to define an object, which defines the visible area and blocks unwanted
light.

With some finish changes I get a map, which shows all visible parts in white
and others in black.

Then I define an if_then loop at the trace step.

If you want, I can provide you with some example code.


Norbert

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