[vtkusers] vtkFixedPointVolumeRayCastMapper fix from yesterday

[Randall Hand]

Well, I saw the fix you commited, but I still see my "slots" in the data. 
I've attached a screenshot where you can see it on the right side.

On 7/13/05, Lisa Avila <lisa.avila at kitware.com> wrote:
> 
> 
> 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 
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-- 
Randall Hand
http://www.yeraze.com
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