Karma Shadow Matte

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Is It possible to render shadow matte pass with Karma?
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I tried with Houdini18.5.408, it seems not working.
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Hi. Karma does not yet support shadow matte or have a shadow catcher. As a workaround you could output shadowed and unshadowed AOVs and take the difference to generate a shadow pass in comp.
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dlee
Hi. Karma does not yet support shadow matte or have a shadow catcher. As a workaround you could output shadowed and unshadowed AOVs and take the difference to generate a shadow pass in comp.
Still no solution in 19.5?
What's the holdup?
tamte
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OneBigTree
Still no solution in 19.5?
What's the holdup?
I personally haven't used Karma much, but there is this since 19
https://www.sidefx.com/docs/houdini/nodes/lop/backgroundplate.html [www.sidefx.com]

Does it not provide AOVs you are after?
Tomas Slancik
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It has worked for me before (with some small caveats), if you use the holdout LOP, connect its second output to the second input of the karmarendersettings lop in question and then hook on the "Import render vars from second input" on the Image Output - AOVs tab of the karmarendersettings.
*Edit: "Before" as in: earlier today, on build .387
Edited by protozoan - Oct. 3, 2022 14:56:19
Martin Winkler
money man at Alarmstart Germany
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tamte
OneBigTree
Still no solution in 19.5?
What's the holdup?
I personally haven't used Karma much, but there is this since 19
https://www.sidefx.com/docs/houdini/nodes/lop/backgroundplate.html [www.sidefx.com]

Does it not provide AOVs you are after?
I am not looking for AOVs I need a Matte shader for catching shadows and mask objects in the scene with complex geometry, like the Redshift Matte_Shadow - without having to go through a comp first. As far as I understand the Background plate is meant to catch a camera projection to interact with the scene.
I have also a bunch of problems with controlling render visibility using the standard matte shader for Mantra (which works in a way in solaris) but it is all too much hassle for the quick turnaround I need.

https://www.sidefx.com/forum/topic/86688/ [www.sidefx.com]

Edit:
I tried the Background plate but it seems just as problematic and it doesn't exactly do what I need.
Edited by OneBigTree - Oct. 10, 2022 11:47:30
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protozoan
It has worked for me before (with some small caveats), if you use the holdout LOP, connect its second output to the second input of the karmarendersettings lop in question and then hook on the "Import render vars from second input" on the Image Output - AOVs tab of the karmarendersettings.
*Edit: "Before" as in: earlier today, on build .387

Hi! Thanks for the tip. What do you mean by "Holdout LOP"? I've done a search for Holdout in Lops but I'm not finding anything.

Thanks for any help!
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