In Rhino 5, I used to be able to report a larger bounding box for my custom object so that any curves etc. drawn outside the object’s geometry bounding box in the
MyCustomObject::Draw(CRhinoDisplayPipeline&) functions are still visible when the object itself moves out of the viewport frustum. This seems no longer to be the case.
Now in Rhino6, when I move the object out of the frustum, all other things that are drawn are no longer visible, because the
Draw function of the object is no longer called. For example: I mirror the section curves of a hull in the XZ-center plane to show them on both sides, even though the hull only has a surface on one side because it is symmetric. As soon as the half-hull is no longer visible in the viewport, the mirrored curves also disappear (even though their position is most definitely still inside the viewport frustum), most likely because the drawing routines think the object is no longer visible and cull it from the scene. As said, in Rhino 5, I reported the mirred bounding box in the custom object
BoundinBox() functions and this solved the problem. This does not work anymore.