Fixed Point ray cast does not render properly 2 components

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Hi,

I have some troubles with FixedPointVolumeRayCastMapper when using 2 components. I have created a simple test in Python.

The dataset is a set of planes convolved with a sinc with 3 lobes along the x axis.

The transparency is set to be 0.0 below 0.1, 1.0 above. Only positive lobes are displayed.

With 1 component, the image is what I expect. With 2 components, the 2nd being the copy of the first, some planes are not rendered completely ??
im1 im2

If I use the SmartVolumeMapper, I get what I expect with the 2 components.
im3

Is there something wrong in the setup/parameters or limitations in fixed point ray cast ?

Thanks
Pierre TURLAIS
tst_plane.py (3.9 KB)