PDA

View Full Version : Black areas in transparency - see image!

earwax69
06-11-2010, 08:31 AM
http://img813.imageshack.us/img813/3374/testbocaux.jpg


Ok, I did this little test here for a project. The glass texture is NOT double sided as the glass have already 2 sides. If I enable double sides, it get very ugly, not realistic at all. Is there a way to fix the blacks without enabling Double sides??

My rays recursions is at 20. No difference while going higher.

thanks
VirtualFM
06-11-2010, 01:57 PM
What's your backdrop colour?!

Wait! Let me guess... Black?! :-)

Change your backdrop for a colour that suits you, or make it a gradient, or better yet, use a background image, or HDR.

Explanation: It seems that what you are getting are reflections/refractions of your backdrop because you are using a ground plane too small, that finishes right out of camera view, so we can see the edges of that plane and then the background, which must be black.
earwax69
06-12-2010, 02:09 AM
No, the background is not black, its a gradient backdrop for the radiosity. I noticed that the blacks are also holes in my alpha channel... when I export the sequence to after effects, the blacks are transparent area.
walfridson
06-13-2010, 11:43 AM
ray recursion?
earwax69
06-13-2010, 01:48 PM
I found the problem... RayTrace Occlusion was on! with RT occlusion off, all is clean!!

sorry for the trouble, thanks for the replies!
VirtualFM
06-16-2010, 04:27 PM
Thanks for updating the solution. Curious, I usually use RT Occlusion... but probably never had a scene with glass when using it! Lucky me!
earwax69
06-19-2010, 04:30 AM
I dont even really know what RT occlusion do actually.
CGTalk Moderation
06-19-2010, 04:30 AM
This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.