PS:
I tried some other plain C volume rendering examples. Most of them complained
about not being able to find GL_EXT_texture3D, an OpenGL extension, and would
refuse to run, if I forced them, crashes are experienced.
I downloaded OpenGL Extensions Viewer from http://www.realtech-vr.com/glview/,
and I could see that for my card and drivers (NVIDIA GeForce MX 440) , this
extension appears as GL_EXT_texture3D (GL_VERSION 1.5) under 1.2 Core
features,
but is not reported in the report, and the following is also given in
the report
GL_EXT_texture3D not in list but has the entry point glTexImage3DEXT
In relation to this, I have found the following discussion about my NVIDIA:
http://www.gamedev.net/community/forums/topic.asp?topic_id=332346\
Where it says that 3D Textures are not hardware supported.
So I guess this is the reason why these other volume rendering C
examples do not
want to run. But then, it makes it even more surprising how is it possible to
run the OpenSG volume renderer examples. Even stranger - after a suggestion on
the forum above (that it will be possible to run in software mode - slow), I
found a software emulation key in the OpenGL Extensions Viewer and I
tried it -
the other C volume rendering examples would still not run, OpenSG volume
rendering examples would run slow - if I turned off software emulation again,
OpenSG volume rendering examples would again run smooth!!
Well, after knowing this, I am very pleasantly surprised that OpenSG volume
renderer examples can run at all on my machine :) But how come? Is this
hardware problem possibly a reason for not being able to run VR Juggler and
OpenSG volme rendering together ?
Cheers
smilen
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