Thanks very much, cleaning up html did the job. If its still of intereset, i use windows 7. Haven't seen my HTML mistake, so thanks again, curator

Get the "container[s]" of the entities, get their "transformation[s]", then transform the vertex's point to match. Then you'll have the point in the model coordinate system, not the point in the container's coordinates system... This will give you the path through the nesting: http://www.sketchup.com/intl/en/developer/docs/ourdoc/model#active_path See these methods to get the 'accumulated' transformations of each container: http://www.sketchup.com/intl/en/developer/docs/ourdoc/transformation

Hi, thanks for the Tip. I looked their and synced the position with the position, the target with the focal point and view up with view up. That seems to work pretty good in the first attempt, but I am not allowed to zoom in or out, since then both view are not the same anymore (basically the vtk window does not "rescale". vtk has the zoom or setdistance function, but I expected them to be given indirectly be the distance between position and focal point. what information have i missed?

@curator said: How can I add, sets say, an option like "change radius" or "change position". How do I add such an option only to "sphere", and not to "cube" or whatever. IF you use a group: UI.add_context_menu_handler {|menu| sel = Sketchup.active_model.selection if (not sel.empty?) && sel.single_object? && sel.first.is_a?(Sketchup;;Group) && sel.first.entities.parent.name == "Curator_Sphere" menu.add_item("Change Radius") { # do code here, or call a method like; Curator;;SphereWorx;;set_radius(sel.first) } end } IF you use a component instead: UI.add_context_menu_handler {|menu| sel = Sketchup.active_model.selection if (not sel.empty?) && sel.single_object? && sel.first.is_a?(Sketchup;;ComponentInstance) && sel.first.definition.name == "Curator_Sphere" menu.add_item("Change Radius") { # do code here, or call a method like; Curator;;SphereWorx;;set_radius(sel.first) } end }