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How to set opacity of a mesh with post process


I'm making a toon shader but i have problems with the outlines PP material.

Without masking the skybox there are lines in it so I don't want that and when it's masked the objects with the sky as background aren't outlined anymore.

So I placed a sphere (with inverted normals) and now the outlines are good evrywhere and the skybox is clean but the problem is i need to set the opacity or at least hide this sphere where the PP mask is (in green on the second image).

alt text

Can someone help me please ?


Product Version: UE 4.19
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asked Sep 16 '18 at 01:04 PM in Rendering

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Simple Boy Dev
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