dick balaska <dic### [at] buckosoftcom> wrote:
> On 12/15/2017 07:50 AM, Bald Eagle wrote:
> > dick balaska <dic### [at] buckosoftcom> wrote:
> >> On 05/29/2017 03:42 PM, dick balaska wrote:
> >>
> >>   > Help, Math wizards, you're my only hope.
> >>
> >> I have started again to try to tackle this problem.
> >>
> >> Scott's solution gave me a vector, which is not what I need. :(  I need
> >> an angle.
> >>
>
> http://www.buckosoft.com/tteoac/video/testRenders/test3.mp4
>
> Eureka!
>
> The solution is to rotate it with the Cartesian result and then
> translate it with scott's vcross-ish solution.  i.e.
> ...

See this post for an alternative solution:

From: Tor Olav Kristensen
Subject: Reorienting a flashlight along with the camera
Date: 17 Dec 2017 15:00:00
http://news.povray.org/povray.text.scene-files/thread/%3Cweb.5a36860f8dfaa90bb572bd120%40news.povray.org%3E/

It's interesting that no trigonometric functions are needed for this.

--
Tor Olav
http://subcube.com

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