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/test2.mp4

The first 3 moves are correct, when I move x or z. As soon as I move 
both, all hell breaks loose.

The kid in my movie is carrying a flashlight.  It has an offset of 
<-0.4,-0.3,0.7> from the origin and points down the Z.
The red ball is Lookat.
I have the angle between Lookat-Camera shown by the cyan ball.

It seems to me that if I move my flashlight to its offset, rotate it by 
the Lookat-Camera angle, then add the Camera vector, it SHOULD BE LOCKED 
TO THE CAMERA.

argh.

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