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Include/Exclude Objects in Clipping Material

Posted: Mon Feb 07, 2022 9:50 am
by Ilius
Is it possible? i tried to achive that, but the Clipping Material doesnt give a lot of options to play around and documentation is also not up to speed.

Re: Include/Exclude Objects in Clipping Material

Posted: Tue Feb 08, 2022 8:20 am
by bepeg4d
Hi,
is it not possible for you to use the C4D Object Manager for this?
If you parent some closed objects to the main clipped object, they are directly included in the clipping:
A3ED32CA-2588-45E5-81A0-6A709DF089EB.jpeg
ciao,
Beppe

Re: Include/Exclude Objects in Clipping Material

Posted: Tue Feb 08, 2022 8:30 am
by Ilius
Sorry, i must have not been clear enough.

By Including and Excluding Geometry, what meant was to include/exclude Geometry that is to be clipped. Not Geometry that will clip.

Because right now, if i want to clip my scatter to have a clean grassline on the edge of a walkway, it just clips through everything and i would have a black hole looking into abyss.

Re: Include/Exclude Objects in Clipping Material

Posted: Tue Feb 08, 2022 5:15 pm
by jayroth2020
Materials with a priority higher than the clip material priority will be exempt from the clipping operation. Clipping uses the same priority as Nested Dielectrics. You can fine tune artifacts by using the Clip material Custom Ray Epsilon value.

To use your example, if you assign the sidewalk a higher priority than the Clipping material, it will be untouched by the operation.

Re: Include/Exclude Objects in Clipping Material

Posted: Wed Feb 09, 2022 2:49 pm
by Ilius
That kinda works, my floor is now excluded in clipping but my grass shows up now as kind of a ghost?
screenshot and scene attached

Re: Include/Exclude Objects in Clipping Material

Posted: Wed Feb 09, 2022 6:06 pm
by jayroth2020
What version are you using?

Re: Include/Exclude Objects in Clipping Material

Posted: Wed Feb 09, 2022 6:16 pm
by jayroth2020
You are not using Octane Object tags in your scene. Add one to the Hof.1 object, and in the tag's Visibility tab, disable Shadow Visibility. This will remove the shadows from being cast from the clipped objects.
Clipped_Shadows.png

Re: Include/Exclude Objects in Clipping Material

Posted: Thu Feb 10, 2022 7:12 am
by Ilius
Thanks, thats pretty counter-intuitive but it works now, cool thing, thank you

Re: Include/Exclude Objects in Clipping Material

Posted: Tue Feb 22, 2022 3:24 pm
by Ilius
I've noticed a new problem which i dont know a way around - the clipping material prohibits shadows from falling on objects that are "inside" the clipping objects. (See screenshots and scene attched)

is there a way to fix this?

Re: Include/Exclude Objects in Clipping Material

Posted: Tue Feb 22, 2022 4:12 pm
by SSmolak
I don't think that Clipping Material is good choice to make such things. Anyway it should not block shadows that coming from not clipped material...