[vtkusers] Should DataSpacing affect volume rendering?

[Weiguang Guan]

Hello,

I recently find that the DataSpacing of volume data has a great impact on 
the quality of volume rendering (both vtkVolumeTextureMapper3D and 
vtkVolumeRayCastMapper). But I think the number of slicing planes (or the 
interval of slicing planes) used (in vtkVolumeTextureMapper3D) should be 
proportional to the dimensions of a volume, and should have NOTHING to do 
with the data spacing.

The attached is tcl script showing the influence of DataSpacing on volume 
rendering. You can scale up/down the original spacing (by 10 or 1/10 for 
example) to see how volume rendering responds. The problem is more than 
rendering quality sometimes.

Weiguang
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Medical1VR.tcl
Type: application/x-tcl
Size: 4093 bytes
Desc: 
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20070319/e964c7e5/attachment.tcl>