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View Full Version : Rotated/sheared camera frustum - is it possible?

3drevolutionprod
07-01-2007, 01:45 PM
Hello y’all,

I am after something that may actually not be possible, but I thought I’d ask just in case one of you knows of a way of doing this. What it is I am interested in is a non-symmetric, rotated camera frustum. So not just an off-axis camera frustum (non-symmetric), but actually a rotated/sheared frustum. Crazy idea, yeah, but who knows, it may just be possible. Here’s a drawing of the idea:

http://www.the3drevolution.com/nscf.gif

The frustum is the region of the camera cone that the 3D software uses to render the image. As you can see, a non-symmetric, rotated/sheared one would be something the camera itself needs to be able to do, and so it’s probably a core-program issue I should be taking up with Maxon (or Autodesk folk, for that matter). But maybe, perhaps, it is possible to Xpresso or C.O.F.E.E. it all.

Such a twistable (and ideally, animatable) frustum would created tremendous new possibilities in visualization and give a new tool in terms of doing something real world cameras just can’t do – one of the raisons d’etre of CGI. So… any ideas or is this just too crazy a concept?

Cheers,

Alexander
bobtronic
07-01-2007, 02:38 PM
Use the Film Offset X/Y parameters of the camera object and rotate the camera, it's basically the same what you are describing.

cheers,
Bob
3drevolutionprod
07-01-2007, 02:55 PM
So you think that do it like this will result in the same image, with the same distortions?

http://www.the3drevolution.com/nscf2.gif

That would be a quick, easy solution...

Cheers,

Alexander
bobtronic
07-01-2007, 03:11 PM
So you think that do it like this will result in the same image, with the same distortions?

no, as I said you have first to use the Film Offset X/Y parameter of the camera object to distort the fulcrum and then rotate the camera to bring back you object into view. attached a screenshot and a scenefile of the distorted camera in cinema4d.

cheers,
Bob
3drevolutionprod
07-01-2007, 03:31 PM
Thanks, that's a fantastic solution. :)
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