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Different material at front and back of a plane?

Posted: Mon Nov 14, 2016 4:52 pm
by Elele
Hello,

is it possible to apply a different material at front and back of a plane?

Thanks,
Elele.

Re: Different material at front and back of a plane?

Posted: Mon Nov 14, 2016 9:54 pm
by face_off
Hi Elele - Octane will only render one side of a one sided plane. To render both sides it needs to be a two-sided plane.

Paul

Re: Different material at front and back of a plane?

Posted: Mon Nov 14, 2016 10:31 pm
by Elele
Hi Paul,

What does that mean exactly? Do I need two actual pieces of geometry with opposite normals? Or is there a way to define a single plane as a two-sided plane?

I want to render a cup, where you would both see the inside aswell as the outside. But I would rather not model actual thickness on the cup since it is so thin. Do I duplicate the geometry and flip the normals of one?

Thanks.

Re: Different material at front and back of a plane?

Posted: Mon Nov 14, 2016 10:53 pm
by face_off
The sides of a cup (or any object) have a (non-zero) thickness - so this needs to be modeled as two sides, not one.

Paul

Re: Different material at front and back of a plane?

Posted: Wed Mar 01, 2017 10:49 pm
by Hydra
Is it possible to tell Octane that a plane has two sides?

I have several models with planes facing random directions (yeah... a texture that's facing towards a camera in one place, and away in another). Its also a serious issue with models which textures that emit.