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This looks usefull unsergio!

Still a lot of things to forget when in production (but we might use the take manager for that)
At least it looks like a decent shadow pass.
Thanks for the post.

TheOracle wrote:It could be that i'm missing something.

maybe...

check here:
viewtopic.php?f=51&t=44267

here u are....i think thats what u need.
set ur path for the multipass....

Good morning!
I was working on a scene and got a bit confused. How to hide my objects but in the same time keep shadows from those objects in the render?

The idea is - my fish is falling on the floor. I need to compose it with a video piece so, I need a shadow from a light.

I placed a octanelight on top of the scene and floor under the fish and I got the shadow. But when I turn off the floor the shadow disappear (no doubts

I tried to put a object tag on the floor and uncheck "camera visible" , and kept "shadows visible" box checked but unfortunately it didn't work out.

is there any way to keep the shadow from the object on the hidden surface?
At this point the only way how I made it work - I used green color on all surfaces except the fish itself and key the sequence in after effects. Is there better and simplier ways to do it?
Please share if you know
Thanks!

This has already been answered here.

(Merging with previous post)

Hey guys,

I'm gonna need some help on passes/shadow passes, unfortunately the tips provided in the posts above don't work on my project.

I've a fairly simple scene with a landscape and some clouds created in houdini and imported as an VDB, rendering the VDB Volume with Octane. Is it possible to extract the shadow on the landscape as a single pass? I tried the setup NVN provided but it doesn't seem to work with VDBs. Placing a mesh inside the scene works...

Can someone help me with the right setup? It would be much appreciated.

Current setup:

Floor: Layer ID 1, Bake ID 1
Cloud/VDB Container: Layer ID 2, Bake ID 1
Rendersettings: Render Layer enable / Layer ID 1, Invert checked, Black Shadows checked

Thanks in advance.

KeeWe wrote:Hey guys,

I'm gonna need some help on passes/shadow passes, unfortunately the tips provided in the posts above don't work on my project.

I've a fairly simple scene with a landscape and some clouds created in houdini and imported as an VDB, rendering the VDB Volume with Octane. Is it possible to extract the shadow on the landscape as a single pass? I tried the setup NVN provided but it doesn't seem to work with VDBs. Placing a mesh inside the scene works...

Can someone help me with the right setup? It would be much appreciated.

Current setup:

Floor: Layer ID 1, Bake ID 1
Cloud/VDB Container: Layer ID 2, Bake ID 1
Rendersettings: Render Layer enable / Layer ID 1, Invert checked, Black Shadows checked

Thanks in advance.

It may not yet working with volume objects. These are not supported also in info passes. Can't you confirm that by testing any other objects and compare results?

It works with putting a cube in the scene and set it up just as the VDB. So probably you are right. :/
Is there a way to get the Volume AND the Shadow in one pass. So basicaly just without the landscape. Using a matte instead of the actual Texture doesn't seem to work. But i think i had some settings yesterday where i saw the volume and the shadow on the alöpha channel. I just can't seem to recreate this...

Edit: ok, i probably got the workaround: turn of the render passes, assign a matte material to the landscape, enable Alpha and render the Volumes with the shadows in one Pass. In Comp i I have to mask the Volumes by hand to manipulate the shadows which is time consuming but in this setup doable.

Aokatar, is there a way to get the shadows only from a volume in the near future?

Edit: Camera visibilty works just fine on the cube. I can hide the mesh but still get the shadow in this setup. VDBs are not affected by general visibility nor camera visbility.

KeeWe wrote:It works with putting a cube in the scene and set it up just as the VDB. So probably you are right. :/
Is there a way to get the Volume AND the Shadow in one pass. So basicaly just without the landscape. Using a matte instead of the actual Texture doesn't seem to work. But i think i had some settings yesterday where i saw the volume and the shadow on the alöpha channel. I just can't seem to recreate this...

Edit: ok, i probably got the workaround: turn of the render passes, assign a matte material to the landscape, enable Alpha and render the Volumes with the shadows in one Pass. In Comp i I have to mask the Volumes by hand to manipulate the shadows which is time consuming but in this setup doable.

Aokatar, is there a way to get the shadows only from a volume in the near future?

Edit: Camera visibilty works just fine on the cube. I can hide the mesh but still get the shadow in this setup. VDBs are not affected by general visibility nor camera visbility.

Sorry but lot of words doesn't make any sense on my old brain. Maybe i'm tired. Please describe the problems with scenes and images.
Volume is core function, not a thing which can be changed by plugin devs. I think it will be fixed. But visibility is not implemented in plugin side. Maybe for next versions.