On 17 September 2016 at 18:39, Sebastian Messerschmidt <sebastian.messerschm...@gmx.de> wrote: > Hi Ravi, > > Thanks Robert! > > So do you know why using osg_Vertex works *without* using > setUseVertexAttributeAliasing() on so many machines? I am compiling OSG with > GL2 (no GL3 flags) on all machines. Is it just "undocumented behavior"? > > That is probably simply by chance, since the vertex attribute is usually the > first one in the stream. The compiler will map the first attribute there. So > basically this works most of the time.
This sounds plausible. > Next question: if I use setUseVertexAttributeAliasing, then many of my > textured polygons (e.g. Sphere) have what appears to be a flat color on > them. The actual color used seems to be related to one point on the texture. > > I see similar behavior if I run the "osgvertexattributes cow.osg" example > (see attachment). Is Vertex Attribute Aliasing something that's only > intended for GL3? > > The cow model might not have texture coordinates but generated texture > coordinates. I can't test the example right now, but maybe this is the > reason. Usually when you go with vertex attribute aliasing you need to use > an appropriate shader for the data. The cow.osgt uses tex gen to generate the texture coordinates. Robert. _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
