Hi Richard, Here's what I would do to start:
0) Read the QuickStartGuide if you haven't already. 1) Make two Geodes, one with a Cylinder as the Drawable, and the other with a Cone, (these are convenience classes which the osg provides) and add each Geode as the child of a MatrixTransform or PositionAttitudeTransform node. 2) Derive a class(es) from NodeCallback, overriding the operator()(Node*, NodeVisitor*) method with the behavior you want for each component of your arrow (setting the orientation or scaling or whatever you want) based on the interface device data. Matrix::rotate(Vec3 from, Vec3 to) will create a rotation matrix which rotates your objects from some starting orientation - the original axis of your arrow - to another orientation - the desired axis of your arrow. 3) Attach the callback(s) to the appropriate transform node(s) using Node->addUpdateCallback(derivedCallbackClass) 4) Add your root node as the scene data of an osgViewer::Viewer, and either do a frame() loop or viewer.run(). The QuickStartGuide will have everything you need to know about that. Hopefully that'll get you started... Cheers, Tom ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=31994#31994 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
