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bump problem with small object and high focal length


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Hi, 

Im fighting with a strange bump error what appears very often to me.

I have a small object and a simple shader with some bump. If I have a very close camera it renders correct. But I want to render it with a zoomed in camera or by changing the screen window size directly in the camera. Rendering with the camera farther away from the object gives strange errors in my renders. 

I made example scene that shows that behavior. 

If anybody has an idea how to fix that would be very great. Thank you. 

Jon

bump_problem.jpg

Bump_Problem.hip

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