[vtkusers] Raycasting Isosurface-Function - strange behaviour

[Stefan Bruckner]

Hi.

I noticed a strange behaviour of the Isosurface function for ray
casting. When using trilinear interpolation the surface is extracted
differently.

I have attached two images of a feet dataset to show this.

The first image shows the rendering with nearest neighbour
interpolation. The rendering looks just as one would expected.

The other one shows trilinear interpolation - in this image you can see
"inside" the volume, as if the scalars inside were lower than the
threshold.

Apart from the interpolation type, these images were rendered using
exactly the same parameters.

Can anyone please explain me why this happens?

--
Thank you,
Stefan Bruckner
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