On 0, "Eric G. Miller" <egm2@jps.net> wrote: > On Sun, Sep 22, 2002 at 04:11:44PM +0930, Tom Cook wrote: > > Hi all, > > > > This may be a mesa bug or it may be a manifestation of my ignorance of > > opengl. If the latter then I apologise for OT posting. > > > > I am playing with clipping planes in an effort to do some fancy stuff > > in 3D graphics. My problem is that mesa appears to only let me define > > a client clipping plane once. That is, the first call of: > > > > glClipPlane( GL_CLIP_PLANE0, vector ); > > > > correctly defines a clipping plane. But all subsequent calls to it > > have no effect on the clipping planes. > > > > This seems something of a major restriction to me, since mesa only has > > 6 client defined clipping planes to play with, and these are soon > > exhausted. > > > > So have I misunderstood something, or is this a mesa bug? I wanted to > > ask before I filed a bug. > > In grunting around some code that does clipping planes, seems you > need to call glEnable/glDisable after glClipPlane. At least, > that's what the code I looked at does. Calls glEnable if the > plane was turned on, and glDisable if it was off. It queries > glIsEnabled(GL_CLIP_PLANE0 + (num)) prior to calling glClipPlane(). > I guess glClipPlane() possibly toggles the state (or just turns it > off). I'm no OpenGL guru ... Thanks for the tip! Turned out I had an extra level of glEnable/Disable( GL_CLIP_PLANE0 ) around my code. Thanks Tom -- Tom Cook Information Technology Services, The University of Adelaide "Other people's priorities are endlessly odd." - Kingsley Amis Get my GPG public key: https://pinky.its.adelaide.edu.au/~tkcook/tom.cook-at-adelaide.edu.au
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