[vtkusers] vtkFixedPointVolumeRayCastMapper fix from yesterday

[Lisa Avila]

Oh yeah, plenty of ideas. Sounds like I didn't handle that case very well! 
:-) I'll try to get the fix in tomorrow. (Hmm, after midnight - later today 
I guess)

The problem probably wasn't there before - I added extra code to make sure 
I absolutely never ever step outside the volume (the old code was letting 
some round-off errors in the conversion to fixed-point cause the last step 
to potentially be out of the volume) but I guess I was a bit too 
aggressive! Should be a simple fix....

Lisa


At 03:31 PM 7/13/2005, Randall Hand wrote:
>The fix from yesterday afternoon fixed my 45-degree volume rendering 
>error.  But it's introduced a strange new quirk.
>
>When rays are perfectly parallel to an axis aligned plane (eg: the planes 
>of the dataset are parallel to the viewing direction), I get black.  So as 
>the volume rotates, you can see "between" the slices as each coordinate 
>plane comes parallel to the viewing direction.  it never did this before, 
>and i'm pretty sure it's not supposed to be doing it now.  My dataset is a 
>Structured Points dataset.  I thought that "between" the points would 
>simply be interpolated or Nearest Neighbored (depending on the mapper 
>configuration) to fill in between them.
>
>any ideas?
>
>--
>Randall Hand
><http://www.yeraze.com>http://www.yeraze.com
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