Issues with Transparency when Using Render to Texture Max 2013

tweekedgirl

Hey everyone, I'm wondering if anyone can help me out with this little issue?
I've created some trees and now I'm trying to use render to texture with projection mapping to create an image of the tree to be put on a plane, so that I can have the trees in the background of a scene without using a ridiculous amount of polys.

Trouble is when I'm coming to render it out, the transparency isn't working. I have no clue why as it worked fine when I was using it to create the leaves. I've attached a picture of what the tree looks like in the viewport (as you can see the leaves have transparency) and also what the render looks like.




Thank you to anyone who can help as this is a major pain in the backside right now!

marks

Yeah, it's broken in max's RTT afaik - unfixable. You could always render out an opacity mask as a separate RTT bake.

tweekedgirl

Really.
The issue with that is when I render out an Alpha map I get the same issue, it just renders out flat planes. Some awful Photoshop job might be in order here...

marks

Hmmmm if you didn't have overlapping alpha cards you'd be ok to render out an alphamask as a diffuse bake, but that's gonna give you artifacts here ... you could try aligning an ortho camera with the plane and rendering out using the viewport renderer (would be fine unless you need normalmaps most likely). It's a bit of a hacky solution though, but render quality should be ok.

tweekedgirl

Fixed it! Seemed the problem was that I was using the MR renderer. Switched to scanline and all is well

Eric Chadwick

Some more ideas here
http://wiki.polycount.net/NormalMap#Baking_Transparency
http://wiki.polycount.net/CategoryEnvironmentFoliage