Toolbag - Possible to get or render depth buffer for custom post effect?

Hey all!

I am working on a cel shader and wanted to add Sobel edge detection. For this, I need access to depth information. Is it possible to access the depth texture used by something like the DoF post effect? If not, is it possible to use a fragment shader to render all objects in the scene to a depth buffer? I'm having difficulty trying to understand how some of this information is passed around between shaders.

Thanks for any assistance!

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