Experimenting with tri-dimensional interpolation methods for sparse data:

This one is not fit for the job it seems, especially since the input data will often be only 6x6x6.
I'm probably gonna need a more linear than cubic interpolator here.

That's Apache Commons Math TricubicInterpolator, comparing 64x64x64 reference output with interpolated input from 2x2x2 to 16x16x16 sizes.

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