Re: Lookup tables for unstructured meshes

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Chikai Ohazama (chikai@talula)
Tue, 18 May 1999 10:24:17 -0700 (PDT)

If I'm guessing correctly, you're defining the the unstructured mesh with
a bunch of tetras with explicit colors for each vertex. voLookupTable
adjusts the lookup for textures, therefore it will not affect the colors
that you have assigned to each vertex. One thing that I would possibly
recommend, is to map your colors into a texture and assign texture
coordinates to each vertex and keep the color white. Then the changes
with voLookupTable should affect your volume. The only thing that I'm not
sure of is how the interpolation will work out (it'll be dependent in how
you setup the texture). I would also recommend using a luminance texture
and using a RGBA lookup, rather than a RGBA volume.

________________________________________________________________________
Chikai J. Ohazama, Ph.D. SGI
Member of Technical Staff 2011 N. Shoreline Blvd. ms 525
Advanced Graphics Division Mountain View, CA 94043.1389
                                     Telephone: (650) 933-6533
                                     FAX: (650) 964-8671

On Tue, 18 May 1999, Manfred Weiler wrote:

>
> I tried to use Volumizer for volumerendering unstructured
> meshes. But when tried to define some transfer function
> for my data I found out that the voLookupTable doesn't
> work for this purpose.
>
> Does Volumizer provide a way to use lookup tables for
> rendering unstructured meshes too or do I have to
> use OpenGL functions?
>
> Does anybody know whether such functionality will be
> included into future Volumizer releases?
>
>
> Manfred.
>

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