> One thing I noticed is that with interpolate 1 there is a distinct shift down
> and to the left.  Is there a bias in the internal interpolate function?  This is
> something that I have noticed before with interpolate.

Yeah - it's to do with where you consider the authoritative pixel value to be -
in the center of the voxel, or in the lower corner.

I remember writing code to correct for exactly that in my DF3 proximity code. I
need to look at it again, as it might have changed during the 3.7 beta cycle
(there was a post about interpolation a few months back I recall).

Cheers,
Edouard.

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