Question by haruspexile · Mar 30, 2013 at 03:32 PM · camera shader depth-buffer image effect

Desaturating based on camera depth in an image effect?

I'm trying to desaturate objects based on their distance from the camera, but I'm having serious trouble getting depth information into my post-processing shader. I've tried using a texture parameter on the shader (_DepthTex) that I assign to every frame from the image effect script:

RenderTexture depth = RenderTexture.GetTemporary (source.width, source.height, 24, RenderTextureFormat.Depth);

desaturateMaterial.SetTexture("_DepthTex", depth);

Which seems to just return white, and I've tried using the Unity depth macros (_CameraDepthTexture, UNITY_OUTPUT_DEPTH), which only seem to return black.

Thanks for your help!

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whydoidoit · Mar 30, 2013 at 03:43 PM 0

What platform are you running on?

haruspexile · Mar 30, 2013 at 03:46 PM 0

PC/Mac/Linux

whydoidoit · Mar 30, 2013 at 04:13 PM 0

How are you rendering the camera into the depth texture?

haruspexile · Mar 30, 2013 at 04:16 PM 0

I've tried just blitting it (Graphics.Blit(source, depth)) before passing it into the shader, and I've also tried getting it directly from the Camera using DepthTextureMode.Depth and _CameraDepthTexture.