Different textures with same geometry

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From: Manfred Weiler (Manfred.Weiler@informatik.uni-stuttgart.de)
Date: 09/12/2000 09:03:21

Hi Volumizers,

I have experienced some strange effects in OpenGL Volumizer.
I was trying to render two appearances using the same geometry.
It works fine if the different appearances share the same
texture format. Now I try the same with different formats:
a Lum/Alpha and a RGBA-Texture constructed from the same data set.
When switching between these two textures I recognize a slight offset
and one border of the Volume seems to have sensless values as if the
texture coordinates where not properly set.

I tried the V3F vertex format with texgen and the T3F_V3F format
both with the same effect. Also skipping appearance and geometry
optimization doesn't have any effects. I am quite sure that
polygonization and drawing of the polygons are done with the
right brickset.

I'm using OpenGL Volumizer 1.2 on Octane MXE.

Can anyone think of a reason for the described effect?
Has anyone succeeded in a similar task?

Thanks in advance

        Manfred. 

-- 
======================================================================
Manfred Weiler              Manfred.Weiler@informatik.uni-stuttgart.de
Visualisierung und Interaktive Systeme          Telefon: 0711/7816-208
Universitaet Stuttgart, IfI                         FAX: 0711/7816-340

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