displaying transparent clouds..

[Lisa Sobierajski Avila]

Hello K.R.,

You can use a vtkVolumeTextureMapper2D, which should be significantly 
faster than the ray caster. Also, you can use a vtkLODProp3D to combine a 
couple of texture mappers (one with a reduced resolution volume) and a ray 
caster so that you use a fast technique during interaction and fill in with 
the more accurate technique during idle time. You can try out VolView 
(http://www.kitware.com/volview.htm) to see an example of this being done 
in an application.

Lisa


At 05:48 PM 4/13/00 -0400, K.R.Subramanian wrote:
>
>I would like to be able to display a density volume (single component 
>scalars) with varying opacity.
>Rather than doing ray casting - which is quite slow - is there a a cheaper 
>way to do this
>(on an SGI without 3D texture mapping capability)?  For instance, we have 
>a spherical density field
>whose opacity is maximum at its center and decreases with radius. We would 
>like to visualize
>this as a transparent field. We tried building multiple iso-surfaces, but 
>the concentric rings look
>very much like 2D (with almost no shading). Teh application is to show an 
>object within this field
>and compute an integral of its intersection with teh field.
>
>     -- krs
>--
>K.R.Subramanian                           Phone: (704) 547-4872
>Department of Computer Science            FAX:   (704) 547-3516
>UNC Charlotte, 228A Kennedy
>9201 Univ. City Blvd.                     Email: krs at cs.uncc.edu
>Charlotte, NC 28223-0001                  WWW: 
><http://www.cs.uncc.edu/~krs>http://www.cs.uncc.edu/~krs
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