i have a post processing material that shows the hidden part of the cube as white.
Is it possible to do this and hide the purple plane ?
So basically i only want to see the cube and the white part, the purple i need it to be hidden.
Hey @SophiaWolfie, how are you? Hope you’re doing great! 
How are you applying the mask cut effect on the cube? Is the Post Process using the scene Depth information or a Custom Stencil Value?
You should be able to tell the renderer to draw the Depth and Stencil of the cutting geometry (in your case, the plane) without rendering it in the Main Pass. Check the Rendering options of the StaticMeshComponent for the plane, look for “Render In Main Pass”, and disable it.
To get the effect working correctly, you might need to:
Make sure the geometry used as a mask only populates the Stencil Buffer (or a Custom Depth instead of the default scene depth).
Use that Custom Depth or Custom Stencil Value in your Post Process Material.
Ensure all “mask” geometries don’t render in the Main Pass.
This video will helps! https://www.youtube.com/watch?v=JH07z9Ap1hk
Hope this helps!
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Hi, im fine, thanks. Hope ur doing great too 
Im a complete noob in these post processing stuff and struggle with it.
I just follow the tuts, and stuff ends up working sometimes.
I should have posted my PostProcessing material.
Here it is:
So answering your question:
How are you applying the mask cut effect on the cube? Is the Post Process using the scene Depth information or a Custom Stencil Value?
Seems to be using both ^
Check the Rendering options of the StaticMeshComponent for the plane, look for “Render In Main Pass”, and disable it.```
I did that, and it hides the actual post processing effect:
Make sure the geometry used as a mask only populates the Stencil Buffer (or a Custom Depth instead of the default scene depth).
I dont understand this part. The Stencil Buffer? Is this really necessary to hide the mesh yet keep the effect? Where exactly and how do i implement this.
Sorry this is complicated 
I got it working:
Its not necessary to change any material on the plane or the character.
Its only necessary to assign the PostProcessing material in the PostProcessingVolume.
And then remove the masking plane mesh from the main pass:
So basically, this is all thats needed:
Original PostProcessing material:
As it was already ^.
Then all we have to do is:
Disable the actual plane that is masking the mesh from rendering in the Main pass:
Character mesh renders as default, and with original material, and everything defaulty.