Thanks Robert ! Very well explained ! Cheers! Nick
On Tue, Dec 6, 2016 at 10:17 AM, Robert Osfield <robert.osfi...@gmail.com> wrote: > Hi Nick, > > On 6 December 2016 at 05:38, Trajce Nikolov NICK > <trajce.nikolov.n...@gmail.com> 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 > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- trajce nikolov nick
_______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org