Hi Allan, On 23 April 2015 at 02:44, allan xia <[email protected]> wrote: > I am sorry I did not describe the solution clearly. > Now I need to do some extra operations in the models,so I must use shaders > .And different models have little different operations,but mostly same > operations, So I use the same shaders and send a flag variable to the > shaders to judge which model the vertexs belong to. then I could solve the > different operations. and now I use the nodevisitor to judge which model the > vertex belongs to ,but I occur error. > Actually the problem I need to solve is: > how the judge which model the vertex belongs to in the vertex shaders and > fragment shaders?
What do you mean by models in this context? What have the vertex position have to do with the "models"? Normally with scene graph usage a "model" would represent something like a car, a house, or a whole town etc, and would be loaded/created as a subgraph that gets added to the overall scene. With each of these subgraphs you can attach a StateSet to the topmost of node of the subgrah, and have thes StateSet provide a specific Uniform value that can control shaders. Whether this is at all appropriate in your case I cannot say as I can't work out what you might mean. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
