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/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.

So, just so I fully understand what you want,
1. You want to have a flashlight that always points at "Lookat"
2. You want it offset by a certain amount from the camera position

3.  ... ? (if any)

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