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3D textures and filtering

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I am using a 3D texture, and I want to do linear filtering along the s and t coordinates, but I just want to use nearest neighbor across the r coordinate.

Basically my 3D texture is a set of like 40 jpegs, and I want to be able to arbitrarily select a certain picture with the r coordinate. However, right now it is blending
two close pictures together when I do linear filtering. If I do nearest its fine, but then it looks choppy.

Thank you!

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