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Fast bicubic interpolation algorithm?

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Fast bicubic interpolation algorithm?
« on: July 30, 2006, 15:17:20 »
I am sorry if this is slightly off topic, but it is related to a LWJGL game project I am doing... :)

I have eight points forming the corners of a cube.

Each point is associated with a color, and I need to find the interpolated color of any point within this cube.

I tried a simple bilinear filtering approach, but that gives too "square" results. A bicubic filtering approach would be perfect though, and there might be other good algorithms out there as well..?

Do you know of a fast algorithm to solve this?

Thanks :)