[osg-users] Understanding node/traversal masks
Hi guys, I have a scene setup problem that I am sure is easy to solve with OSG if someone could help me properly understand the use of node masks. Consider this scene: Root /\ / \ __/ \__ /\ DecorateGroupRenderGroup \ | \ /\ \ ___/ \ \/\ \___ PAT Subgraph with more objects /\ / \ GeodeA GeodeB I have a group of objects that I want to render, all children of the RenderGroup. Some of these objects I want to decorate by drawing the same geometry with a different stateset that enables cartoon outlines when I pick it. Now I want to add a subgraph to this decoration, but I only want to allow some of the nodes within the subgraph to be affected by the stateset in DecorateGroup. For example, if I attach PositionAttitudeTransform PAT to DecorateGroup, I only want GeodeA to be decorated. I think one way would be to protect attributes that are overridden by the stateset in DecorateGroup, but I don't want to have to do that for all objects that might be picked. I expect this can be done with node masks, but I am not sure how to set up a node mask so that GeodeB is drawn only once when RenderGroup is traversed and not drawn when DecorateGroup is traversed. I would be really grateful if someone could explain this to me. Thanks! Morne Pistorius ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Understanding node/traversal masks
Morn Pistorius wrote: Hi guys, I have a scene setup problem that I am sure is easy to solve with OSG if someone could help me properly understand the use of node masks. Consider this scene: Root /\ / \ __/ \__ /\ DecorateGroupRenderGroup \ | \ /\ \ ___/ \ \/\ \___ PAT Subgraph with more objects /\ / \ GeodeA GeodeB I have a group of objects that I want to render, all children of the RenderGroup. Some of these objects I want to decorate by drawing the same geometry with a different stateset that enables cartoon outlines when I pick it. Now I want to add a subgraph to this decoration, but I only want to allow some of the nodes within the subgraph to be affected by the stateset in DecorateGroup. For example, if I attach PositionAttitudeTransform PAT to DecorateGroup, I only want GeodeA to be decorated. I think one way would be to protect attributes that are overridden by the stateset in DecorateGroup, but I don't want to have to do that for all objects that might be picked. I expect this can be done with node masks, but I am not sure how to set up a node mask so that GeodeB is drawn only once when RenderGroup is traversed and not drawn when DecorateGroup is traversed. I would be really grateful if someone could explain this to me. The term node mask NodeMask referred to in the method osg:Node::setNodeMask and the member varibale osg::Node::-nodeMask can be a little misleading. It may help you to think of it as a set of flag bits to which a traversal mask is applied. If doing a bit wise AND of these flag bits and the current traversal mask results in a non zero value the node will be processed (traversed) otherwise it will be ignored along with all its children. Roger ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
