Christian Sam wrote on Wednesday, May 13, 2009 6:44 AM: > according to documentation: "Fast paths use vertex arrays, and > glDrawArrays/glDrawElements."
Which documentation? > - what is the difference between vertex arrays and glDrawArrays, or is it > meant as generic term for glDrawArrays/glDrawElements? Usually "vertex arrays" means using glVertexPointer() instead of a series of glVertexf(). > will the use of something like this drop me into slow path mode? > > > Code: > > osg::TemplateIndexArray |unsigned int, osg::Array::UIntArrayType,4,4| > *colorIndexArray; > colorIndexArray = new osg::TemplateIndexArray |unsigned int, > osg::Array::UIntArrayType,4,4|; > colorIndexArray->push_back(0); // vertex 0 assigned color array element 0 > ... Using index arrays will drop you into slow path mode, as will binding any of your data arrays PER_PRIMITIVE. See osg::Geometry::drawImplementation() for the exact conditions. > if not, i'm looking for a way to assign normals to vertices per indexed > array, like the colorindexarray above. does this work in the same way? > > > Code: > > osg::TemplateIndexArray |unsigned int, osg::Array::UIntArrayType,3,4| > *normalsIndexArray; > normalsIndexArray = new osg::TemplateIndexArray|unsigned int, > osg::Array::UIntArrayType,3,4|; > normalsIndexArray->push_back(0); // vertex 0 assigned normals array element 0 > ... It's most likely faster (because you'll be avoiding the slow path) to copy your vertices and normals so you can bind the normals PER_VERTEX, even though you'll get duplicates in the array. There was a thread on the mailing list about how to do this recently; I suggest you search the archives for it. HTH, -- Bryan Thrall FlightSafety International [email protected] _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
