render layer pass alpha issue

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

Thread Tools Display Modes
  03 March 2006
render layer pass alpha issue

I apologize for the somewhat nonsensical title, but I am totally baffled. So I had a project I had bulit in Maya 6, had set up a few render layers, and then I installed Maya 7. First issue. Nothing appears in the master layer. So I figure, oh well, and I set up my render layers. Well now I am getting massively frustrated by these layers. I set up separate layers for diffuse and specular because the documentation said it prefers that, but now suddenly I have a materal that was supposed to be transparent, and it always was in Maya 6, but now suddenly in Maya 7, the diffuse pass makes it look solid, but when you flip to the alpha, the transparency is there, but it doesn't account for any of the geometry behind it. A magical alpha hole, if you will.

Am I completely psychotic? Am I just totally missing something???

Thank you in advance for any ideas.
Attached Images
File Type: jpg Bah.jpg (27.3 KB, 20 views)
File Type: jpg BahAlpha.jpg (22.7 KB, 16 views)
"Those who dream by day are cognizant of many things that escape those who dream only at night."
-Edgar Allen Poe
  03 March 2006
I don't have 7 and I haven't used its render layers, but I know from compositing that layering different light passes for a transparent object can be very tedious and sometimes impossible. Especially when you can see the back of the object through the front. I would say just set it up however you want to composite them, not how maya "prefers." With the transparent object, begin with a full color pass and just get the transparency right. Then start breaking out the layers if you really need the control during post processing.

Also check the render layers documentation for anything about layering transparent objects.
  03 March 2006
Thank you kindly for your response. You are correct about transparency renders... it is quite.... painful.... and try as I might, the documentation had said very little. Hence my desperate post.

Oddly enough, last night in my frustration I did a lot of tedious troubleshooting. I ended up importing the whole old scene into a new scene, redid the render layers, and voila it worked. I think it did not love the fact that the geometry wasn't in the master layer. I still don't get why the geometry refused to be in the master layer after I upgraded to 7.0, but I am not going to argue with it. It is now fine.

As for the layers... I did try to still set them up how I wanted, ticking off "diffuse" and "specular" in the render layers options, and it just renders one image right over the other. It seems to demand that I have a separate render layer for each pass using their preset passes. Since I am under a deadline crunch (surprise,) I will bow to the Maya gods and just do it.
"Those who dream by day are cognizant of many things that escape those who dream only at night."
-Edgar Allen Poe
  03 March 2006
Thread automatically closed

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.
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
Thread Closed share thread

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Society of Digital Artists

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump

All times are GMT. The time now is 05:04 AM.

Powered by vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.