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Troubleshoot custom post-processes
If a custom post-processing effect doesn't display correctly:
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In your Project Settings, make sure this effect is listed under one of the post process order lists (see Effect Ordering).
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Check that your effect's Shader compiles and that the reference to the Material in your post process Volume isn't null.
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In the Volume that contains your post process, make sure that it has a high enough priority and that your Camera is inside its bounds.
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Check that your shader doesn't contain any clip() instructions, that the blend mode is Off and the output alpha has a value of 1.
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If your effect doesn't work with dynamic resolution, use the
_PostProcessScreenSize
constant to make it fit the size of the screen. You only need to do this when you also need normal or velocity and color.