Hi Nick, On 6 December 2016 at 05:38, Trajce Nikolov NICK <[email protected]> wrote: > Hi Robert, Community, > > This might sounds stupid so I am apologize upfront. I spent some time > reading the code of TerrainTile and I am seeing it as a Group (right?). When > using NodeVisitors I am seeing the TerrainTiles as part of the scene. When I > want to use it as ordinary Group it is not. > > For example, I have this scene: > PagedLOD->Group->TerrainTile->MatrixTransform->Geode > > MatrixTransform is reporting 0 numParents and Geode->getParentalNodePaths is > up to the MatrixTransform > > I am confused. I am after replacing the TerrainTile with my own Group/Node
The TerrainTile "has a" TerrainTechnique, and it's the concrete TerrainTechnique (such as GeometryTechnique) to take the elevant and image layers assigned to the TerrailTile and create a local subgraph capable of rendering that data. It's entirely up to the TerrainTechnique how it creates and manages it's own local subgraph graph, and typically won't directly assign it to the main scene graph, rather it it's self contained within the TerrainTechnique, this means the parent can be null for the topmost node in the local subgraph. This subgraph is still traversed because TerrainTile calls TerrainTechnique on each traversal, and the TerrainTechnique implementation can decide how best to do the traversal of it's local subgraph. The fact that the local subraphs are traversed means that the NodeVisitor's that are doing the traversal will collect the full NodePath from the root of the scene graph down through the TerrainTile to the local subgraph, so if you want the parental chain then a visitor will provide this for you. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
