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Question by ssylvan · Mar 28, 2014 at 03:16 AM · graphicsdepth-buffer

Get depth texture from RT without the extra pass?

I need to read the scene depth from the shader in an fx pass that happens towards the end of the frame (after any modifications to the depth buffer will occur).

I know I can get a depth texture by using depthTextureMode on the Camera, however this causes an entire extra pass over the whole scene.

Is there a way to just get the depth from the current render target at a given safe point? E.g. I could copy the depth from the RT right before I need it.

I can't find a way to copy just the depth from the RenderTexture (since it's a RenderBuffer, not a Texture).

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avatar image raja.kod.bala · Apr 01, 2014 at 11:42 PM 0
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I've noticed this too. It's strange that even in DX11, there's an entire depth-pre pass to generate this, ins$$anonymous$$d of using w/e is there after Render(). I've posted a related question here. I'm pretty much clueless at this point :'(

avatar image Lokiman · Nov 25, 2015 at 02:20 AM 0
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This is indeed a strange behaviour and I really don't understand why can't you get that depth texture - it doesn't make any sense to me :(

Does anybody know what is the reason behind that?

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