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isosurface collision test

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I've constructed an isosurface using the marching cubes method. I assumed it would be straightforward to do collision testing by trilinear interpolating the point and then checking to see that it is below the isolevel. This didn't quite work...but by trial and error I discovered that if I test the interpolated point against isolevel/2 then it "almost" works...its roughly correct, but still highly inaccurate around complicated regions. Any idea why this might not be working the way I expect?

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