[osg-users] AutoTransform scale to screen algorithm - reference?
Hi, Is there any reference for the calculations in AutoTransform::accept(), when getAutoScaleToScreen() is true? It seems to do the right thing, but I really need to understand how it works for an application. Thank you! Cheers, Frank -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40483#40483 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] AutoTransform scale to screen algorithm - reference?
Reference as in a research paper? As far as I know, AutoTransform's calculations are just linear algebra and a firm grasp of the OpenGL transformation pipeline. Both OpenGL Programming Guide (red book) and OpenGL Distilled (my book) describe the transform pipeline found in OpenGL =3.0, and both books also list at least one linear algebra text for recommended reading. -Paul On 6/14/2011 1:55 PM, Frank Palazzolo wrote: Hi, Is there any reference for the calculations in AutoTransform::accept(), when getAutoScaleToScreen() is true? It seems to do the right thing, but I really need to understand how it works for an application. Thank you! Cheers, Frank ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] AutoTransform scale to screen algorithm - reference?
As I look at it some more, the good news is that I think I understand the part I needed to know about. :) That said, I'm curious about the stuff going on when you have _autoScaleTransitionWidthRatio set to non-zero (default is 0.25), and then set _minimumScale or _maximumScale away from their default values. It looks like some kind of quadratic interpolation maybe? Thanks, Frank -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40498#40498 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] AutoTransform scale to screen algorithm - reference?
It's the block of code that starts here: http://www.openscenegraph.org/projects/osg/browser/OpenSceneGraph/trunk/src/osg/AutoTransform.cpp#L232 -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40499#40499 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
