Hi Marcus, > > I use a TextureGrabForeground to do some multipass > > rendering. I need to access the texture coordinates > > of the valid rect of the texture, depending on extensions > > like GL_ARB_texture_non_power_of_two supported by the > > target machine. Methods like getTexCoords are not exposed > > by the interface... So how do I access the texture > > cords? (Note that the coordinates might change during > > runtime depending on the current size of the viewport > > (resizing, etc)) > > It is possible to get the pixel-size of the viewport (see > getPixelWidth()/getPixelHeight() in osg::Viewport) so you should be able > to use that to compute your actual texcoords. > > Does this help?
Yes, I guess that's what I thought I had to do. But I must know how tex coords are calculated inside TextureGrabForeground, so I guess I'll have to take a look at the code. > mvh > /Marcus > > P.S. Note that if you are using NPOT then I believe the texture > coordinates are normalized (0,0 - 1,1). This is not the case with > TEXTURE_RECTANGLE, which is an older extension and uses unnormalized > coordinates. I don't know which applies in your case. On most machines the coords 1,1 are just working fine, but I encountered this damn intel chip which does not support this kind of extension. And I don't want to know wwhat happens on chips/drivers supporting only TEXTURE_RECTANGLE... Anyway, I think it would be useful to expose this texture coordinates in the TextureGrabForeground class interface. Regards, Toni ------------------------------------------------------- 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 _______________________________________________ Opensg-users mailing list Opensg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/opensg-users
