CGTalk - Alpha background...

PascalR

05-08-2003, 07:40 AM

Hi all!
Just a little question (which could seems stupid):
Does anyone know how to render a background with no alpha channel with maya renderer? (I mean not using a poly or nurbs plane locked to the cam, but the maya cam background feature (image plane)
Sorry if anyone already answered this in another thread, but I didn't find it:shrug:
Thanks a lot for your help :beer:

Oh!if anyone knows the trick for Prman's backplane, I have the same problem :D

Pascal R.

rollmops

05-08-2003, 03:40 PM

You can replace your image plane by a poly and project the image with a 3d persp-projector linked to the camera.
You can use a simple lambert (without diffuse), connect your proj to the incandescance then set the matte opacity to 0.

:shrug:
More simple: just a use background on a plane.!

PascalR

05-08-2003, 07:08 PM

Thanks for your reply rollmops :shrug:
But that means that an image plane will only appear at render time if is alpha channel is white... I feel sad...
Just wanted to know if there was a way to make it possible with the default image plane, but if not I will have to use an object...
Maybe my question was not very clear...maybe that comes from my bad english...
;)
Thanks

Pascal

rollmops

05-09-2003, 08:22 AM

Yes you have unfortunately to add an object in your scene but it won't change anything in the look of the rendering.
Note: this plane must be cast-shadow OFF.
If you have a moving camera you may want to parent the plane to the camera.

PascalR

05-09-2003, 12:41 PM

OK! Thanks rollmop:D

Pascal.

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