Karma Shadow Matte
17371 45 7- tomteller
- Member
- 10 posts
- Joined: March 2020
- Offline
I've also been struggling with this. We oftentimes want to render shadows completely separate (separate EXR), with a shadow catcher on relevant geometry to give comp the ability to mix the shadows / adjust them to their liking. Using Geometry properties and background plate I was able to create all of the necessary mattes / holdouts needed to individual objects & render layers - the one hang-up seems to be getting shadows alone on alpha.
- gladstein
- Member
- 16 posts
- Joined: July 2005
- Offline
A noob question: I saw an LPE holdouts;shadow;CDL in the tutorial "Houdini Karma | Render Matte-Phantom-Shadow", and there are similar-looking LPEs in this thread (post of Feb. 2, 2023 6:57 P.M.)
I understand CDL is an LPE, but what about this holdouts;shadow; prefix? I haven't found any documentation mentioning these names, and I'm not sure where to look---is this an aspect of Karma only, or... ?
Thanks in advance for your help.
I understand CDL is an LPE, but what about this holdouts;shadow; prefix? I haven't found any documentation mentioning these names, and I'm not sure where to look---is this an aspect of Karma only, or... ?
Thanks in advance for your help.
- jsmack
- Member
- 7836 posts
- Joined: Sept. 2011
- Online
gladstein
I understand CDL is an LPE, but what about this holdouts;shadow; prefix? I haven't found any documentation mentioning these names, and I'm not sure where to look---is this an aspect of Karma only, or... ?
Yes, something like that. I think it's Karma specific. As interoperable as LPE's were meant to be, every renderer has their own syntax for renderer-specific stuff.
- gladstein
- Member
- 16 posts
- Joined: July 2005
- Offline
Excellent information, thanks so much!
Now, my final question on the subject: is there any documentation on what LPE prefixes Karma supports? unoccluded is mentioned in the Karma Standard Render Vars documentation, and houdouts;shadow; was mentioned in a tutorial, but what about the others? I found a good explanation in the renderman documentation (https://rmanwiki.pixar.com/display/REN22/Using+LPE) but I'm not clear on which ones Karma supports.
Now, my final question on the subject: is there any documentation on what LPE prefixes Karma supports? unoccluded is mentioned in the Karma Standard Render Vars documentation, and houdouts;shadow; was mentioned in a tutorial, but what about the others? I found a good explanation in the renderman documentation (https://rmanwiki.pixar.com/display/REN22/Using+LPE) but I'm not clear on which ones Karma supports.
- timjan
- Member
- 22 posts
- Joined: Oct. 2015
- Offline
- Mirko Jankovic
- Member
- 104 posts
- Joined: Aug. 2015
- Offline
-
- Quick Links