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https://bugs.freedesktop.org/show_bug.cgi?id=8009
------- Additional Comments From [EMAIL PROTECTED] 2006-08-29 07:58 -------
Could you have a quick look at this "ring shadow" URL, please?
cel://Follow/Saturn/2006-08-29T14:27:49.95173?x=+oB8o9BGDW1WDA&y=AeXMilHfBEkC&z=ODP9RkQgVMea/////////w&ow=0.730223&ox=-0.551377&oy=-0.322312&oz=0.242638&select=Saturn&fov=29.107899&ts=1.000000<d=0&rf=317335&lm=0
I have just tried this URL with celestia 1.4.1 on my Matrox G400 / XOrg 6.8.2,
both with and without the GL_ARB_vertex_program. (Both GL_ARB_vertex program and
GL_NV_vertex_program are software-enabled via driconf on the G400, and I have
disabled GL_NV_vertex_program here in all cases.)
Happily for celestia, I get equivalent (if dark) pictures of Saturn, with
Saturn's shadow falling across its rings, regardless of the
GL_ARB_vertex_program setting. Note also that celestia is using multi-texture
rendering in both cases: it seems that the OpenGL rendering path needs something
more than GL_ARB_vertex_program before it can be used.
However, with my Radeon 9250 / XOrg 7.1, disabling both GL_ARB_vertex_program
and GL_NV_vertex_program means that Saturn's shadow across its rings disappears!
I had originally thought that the shadow wasn't being rendered at all, until I
saw this URL:
cel://Follow/Saturn/2006-08-29T09:35:30.41946?x=+0NycYGJxGNWDA&y=m2Y3cow4O1oC&z=kQLl9SiJ7Lma/////////w&ow=-0.442510&ox=-0.299259&oy=-0.843421&oz=0.057180&select=Saturn&fov=20.361984&ts=1.000000<d=0&rf=22423&lm=0
You'll need ambient light for that one, I think. Basically, Saturn's shadow
looks upside down on my Radeon. I had this even better experience when flying
over Saturn, and seeing Saturn's shadow cross the rings from the completely
wrong direction, almost as if the shadow was coming from an invisible twin
planet. But I forgot to save that URL...
Neither of these URLs triggers bug #8060 later.
So in summary, disable GL_ARB_vertex_program via the celestia.cfg file, and I
think you'll see Saturn's shadow across its rings disappear, although it works
OK on a Matrox G400.
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