Render Layer Display Issue

Become a member of the CGSociety

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

THREAD CLOSED
 
Thread Tools Search this Thread Display Modes
Old 10 October 2011   #1
Render Layer Display Issue

I'm figuring out how to set up render layers in Houdini and need some help. For example, I want to hide my main geometry but have it's occlusion show up on the ground. Similarly, if I wanted to render not the ground plane but the reflection from it onto my main piece of geometry. How in the heck do you do this in Houdini? Such a basic task but I don't know where to look.

The only parameters I found is display, check on or off in render and the display tags. I need help soon. Thanks.
 
Old 10 October 2011   #2
What I was looking for is Phantom. It's in the geometry parameter list under Render.
 
Old 10 October 2011   #3
Originally Posted by jsells20: What I was looking for is Phantom. It's in the geometry parameter list under Render.

Also check out Objects Tab of Mantra ROP, where you can overwrite some of render parameters of rendered objects without touching them (including phantomity ).
 
Old 10 October 2011   #4
Shadow Blur

Sweet, thanks! Very handy.

While I'm on the subject of layers, how would I blur shadows using an area light other than increasing the size? I read something about a shadow shader, but how to create it was vague. Anyone know?

Last edited by jsells20 : 10 October 2011 at 01:02 AM.
 
Old 11 November 2011   #5
Render layers example file

Here is a simple file that comps three simple (and ugly) objects using diffuse, reflect and shadow passes in Mantra. These passes are set up in the render output nodes and you will find one render output per object in the scene. The other objects are set up as mattes in the output node. By rendering all the passes in one go like this instead of using takes and different render outputs per layer, you save on render time and still retain control.

In the comp network you can see how the passes are pulled out of the .pic files using channel copy nodes then recomped using adds and multiply nodes. The shadow is interesting. You render out a shadow pass and diffuse with no-shadow pass then multiply them together. The result is then added to the scene. By altering the Foreground weight of the multiply, you can determine the strength of the shadow. A weight of 0 means the shadow is used completely.

Check out the file and if you have any questions about how it works then let me know.

http://www.sidefx.com/images/storie...nder_layers.zip

Robert
 
Old 11 November 2011   #6
Thanks Robert, I will check that out.

Last edited by jsells20 : 12 December 2011 at 08:39 PM.
 
Old 12 December 2011   #7
Masking Volumes

I have another question regarding masks. I want to know the most efficient way to mask a volume. I could do it by adding a pyro shader to the autodop sop for instance, but the render times are crazy.

I tried a constant shader and tweaked Volume Filter and Volume Filter Width in the sop parameters but the render looks choppy and not fluid like. The constant shader must be only for surface type objects.

Any thoughts?
 
Old 12 December 2011   #8
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
CGSociety
Society of Digital Artists
www.cgsociety.org

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

All times are GMT. The time now is 03:39 AM.


Powered by vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.