Am 13.02.2017 um 17:46 schrieb Klewlis:
> "Klewlis" <nomail@nomail> wrote:
> 
> Anyone know why this works:
> 
> camera {
>     location <-240, 100, 118>
>     //direction <0, 0,  3.0>
>     //right x*1.33
>     look_at <0, 50, 118>
> //experimental
>     #if (frame_number>5)
>             rotate x*(frame_number*10)
>     #end
> //#end experimental
> }
> 
> But this doesn't:
> 
> camera {
>     location <-240, 100, 118>
>     //direction <0, 0,  3.0>
>     //right x*1.33
>     look_at <0, 50, 118>
> //experimental
>         #while (frame_number<11)
>             rotate x*(frame_number*10)
>         #end
> //#end experimental
> }

Because you can't loop over frames in your .pov file. POV-Ray already
does that loop for you, and re-parses the .pov file all over again for
each frame, with values like frame_number acting as some kind of
parameter. So in your .pov file you can test which frame is currently
being rendered, but you cannot actively loop over multiple frames.

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