"SharkD" <nomail@nomail> wrote in message 
news:web.477b2ad4a3477974ea6fcf450@news.povray.org...
> How do I achieve oblique projection using POV-Ray? I've tried messing 
> around
> with the up and right vectors, but have achieved mixed results. Compare 
> the
> following two blocks of code:
>
> camera
> {
> location -z*(CameraDistance)
> look_at 0
> direction z*(CameraDistance)
> up y*5/2
> right x*5/2
> rotate <asind(tand(30)),45,0>
> }
>
> camera
> {
> location -z*(CameraDistance)
> look_at 0
> direction z*(CameraDistance)
> up vnormalize(y-z)*5/2
> right x*5/2
> rotate <asind(tand(30)),45,0>
> }
>
> The latter results in no difference. Am I on the right track by messing 
> with the
> up and right vectors?
>
> -Mike
>

Hi Mike,

No, I don't think you're quite on the right track. Glancing at Wikipedia, it 
seems to me as though oblique projection is just orthographic projection but 
with the screen not being at right angles to the line between the camera and 
the look_at point.

If that's what you're after, then I would have thought you'd want to start 
off by using the POV-Ray orthographic camera (see Orthographic Projection in 
the help file) rather than the default perspective camera and then adjusting 
the sizes of the up and right vectors.

Regards,
Chris B.

Post a reply to this message