> What is the purpose of OSG to specify them separately as follows: > > osg::Transform::RELATIVE_RF.
In short, if you don't know whether you want RELATIVE or ABSOLUTE, then you probably want RELATIVE. RELATIVE is for the typical case where you have a Camera node that specifies the view, and other transforms (below the Camera in the scene graph hierarchy) that place objects in the world coordinate system. This is the "view" and "model" transforms from which the OpenGL "ModelView" matrix gets its name. In this case, the model transform nodes need to specify RELATIVE so that OSG will concatenate them with the view matrix from the Camera node. You might also want to use RELATIVE to create some type of "robot arm" scene graph in which transformations occur relative to each other. This is all fairly basic 3D graphics so I'll recommend you purchase a standard 3D text such as "Real Time Rendering" or "3D Graphics Principles and Practice"; see the recommended reading in the Quick Start Guide. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
