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Write to depth buffer from custom pixel shader?


I want to render a plane but I want to write to the depth buffer using depth values stored inside a texture I send to the material. I know I can't do it using material blueprint (If i'm not mistaken), except for pixel depth offset which is not appropriate for my needs. I found a way to edit sources files to have a custom shading model, but I still can't write to the depth buffer.

My questions are : - Is it possible to write a custom vertex/pixel shader and use it ? I know there is FGlobalShader, but i don't want a post-process shader, and FVertexFactory use a vertex shader from what I know. And I didn't find an example for a material shader. - Is it possible to write to the depth buffer from a pixel shader or one of the source shader ?

Product Version: UE 4.12
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asked Jul 22 '16 at 06:35 PM in Rendering

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It is possible to write custom shader from scratch, yet extremely impractical. However, there is a Custom Depth buffer. Maybe you could use it to achive what you need.

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answered Jul 23 '16 at 03:50 PM

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avatar image keiko_ Jul 25 '16 at 04:51 PM

Using the Custom Depth buffer is heavier because I just want to write to depth buffer but I'll give it a try. I didn't think about it because of the post-process pass I want to avoid.

Is the Custom Depth buffer usable in stereo for each eye ?

Thx for your answer!

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