Am 02.10.2018 um 09:40 schrieb Kenneth:

> HOWEVER... I've been experimenting with the cam_z equation itself-- and found
> that no matter what I do to it, it has no effect on the arrow position, or on
> anything else in the scene(!). I even commented-out the equation, and
> substituted some wildly-different integer values just for kicks... again with no
> effect. I EVENTUALLY realized that cam_z is actually used only once, in cam_dir.
> And cam_dir isn't used at all!
> 
> I have no excuse for not seeing this until now. :-(
> 
> So, cam_z and cam_dir can be erased from the code, to make it a bit simpler to
> examine.

Or, maybe that's actually the problem?

A macro that tries to probe where a particular pixel's ray hits the
scene must know - and process - /something/ about the camera opening angle.

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