I see. Sorry I missed that. I certainly didn't mean to complain that something was out of spec. Just hoping that this feature worked - ahh had more than a range of min=1 and max=1. Yes that's fully compliant, I'll shut up.
In my case I need glPointSize because I want to draw dots on a plane so that their size doesn't vary with distance from the camera. It may sound silly to want to do this, but the application is used in a neuroscience context, and we want to eliminate depth cues due to perspective (without using an orthographic view). Polygons, if I go that route, will be smaller on the horizon than they are when they're close to the camera. Textures have the same problem, I think. Points are perfect for this however. They're rectangular glPointSize() x glPointSize() things regardless of where in the scene they're drawn. If there's another way to accomplish this I'd love to hear it - the ATI drivers have their own issues. Problem with point size of 1 is that it doesn't yield enough contrast when the subject is not looking directly at the plane. Larger point sizes are a simple way to raise the mean contrast without introducing depth cues. Thanks for your insight, however. Sorry for the bother. dan Jerome Glisse wrote: > On 6/21/06, Daniel Sperka <[EMAIL PROTECTED]> wrote: > >> Hi again - thanks for the responses. >> >> I tested again using mesademo 'point'. On my nVidia-based dev machine >> the demo works as expected, for both aliased and anti-aliased points. On >> my target machines (Ubuntu breezy, with xorg 6.8.2 and Mesa 6.3.2), >> glPointSize still has no effect, aliased or not. >> >> Can anyone confirm the mesa release required for the glPointSize fixes >> that went in? >> > > There is nothings to fix here, as Ian said you must query what is the > maximun > pointsize (look in opengl spec) you can set; it happens that on > r200/r100 this > maximun value is 1.0 and that no greatter value are acceptable. > > This behavior is fully compliant with opengl specification, your > program should > not rely on arbitrary pointsize or at least have a fallback way to do > this which > means that it's easier to use somethings else like polygon than glpoint. > > best, > Jerome Glisse > Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
