[vtkusers] problems with rendering using ray casting

[peterm]

Hi

It seems that the opacity transfer function specification is commented out
in your code for some reason.
I don't know what the default behavior should be, but did you try using some
proper values within the range of the volume intensities? What I mean is
that if using the values in your code that are commented out, and the max
value in the volume is lets say 1, than getting a blank screen is the
expected behavior.

Assuming a 0 255 range for the volume, what happens if you use:

opacity_transfer_function->AddPoint(0, 1.0);
opacity_transfer_function->AddPoint(255, 1.0);

Peter


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