Hi Tim and Robert, I just want to give you a feedback. I AM VERY, VERY LUCKY !!!! You took me on the right path.
Thanks for your great support. - Werner - Am Mittwoch, 24. November 2010, 17:13:09 schrieb Robert Osfield: > Hi Werner, > > On Wed, Nov 24, 2010 at 3:02 PM, Werner Modenbach > > <[email protected]> wrote: > > I was told using indexes is leaving fast path rendering. Isn't that the > > case? I would be very, very lucky!!! > > Use vertex/colour/normal/etc index arrays in osg::Geometry will force > the OSG to dispatch data to OpenGL using OpenGL slow paths, as OpenGL > does not support independent index arrays for vertex data. So avoid > using osg::Geometry::setVertexIndices(..), setNormalIndex(..), > setColorIndices(..). These *Indices() methods are deprecated and only > currently kept around for backwards compatibility. > > However, using DrawElementUShort primitive sets (a wrapper around > glDrawElements) to pass in indexed primitive data is directly > supported by OpenGL and is the generally the best way to pass > primitive data as you can share vertex data, reducing the amount of > vertex data you need and enables efficient use of the vertex cache > down on the GPU. > > For you case you should look at trying to minimize both the number of > vertices you have by sharing as much as possible, and reducing the > amount of data per vertex. As Tim suggested you don't need to pass > normal, binormal and tangent vectors as you can compute the third > vector very easily and quickly down on the GPU. You may even be able > to compute the surface orientation data down on the GPU if you start > using deferred rendering techniques. > > Robert. > > Robert. > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- TEXION Software Solutions TEXION GmbH - Rotter Bruch 26a - D 52068 Aachen - HRB 14999 Aachen Fon: +49 241 475757-0, Fax: +49 241 475757-29, web: http://www.texion.eu Geschäftsführer/Managing Director: Werner Modenbach _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
