If one is looking down a camera at a conical frustum (by that I mean a cone with the top sliced off with the cut parallel to base) such that the side of the frustrum has a certain angle with respect to the z-axis, what is the angle between a normal vector to this surface and the line going through the camera?
2026-04-12 01:40:46.1775958046
Angle between a normal vector and angle of observation
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