Hello, I have a peculiar question concerning implementing 3d graphics primitives inside one another. Suppose I have a detector composed of a simple block of aluminum with a hole drilled in the middle. I would suspect we would use TBRIK of material Al and TTUBE of material VACUUM. How does root know which material takes precedence in a volume shared by two materials such as the TTUBE inside the TBRIK? Also, suppose those two primitives shared a common origin. Is it possible to have both primitives referenced by the same TNode, or is it necessary to have a TNode duplicated? I'm guessing that in such an instance, one would want to combine all objects "attached" sharing a node to be represented by a class of type TShape. But then the question becomes, which virtual functions of TShape are necessary to overload in order to get a correct TShape behavior? And finally, as the geometry becomes complicated I need to highlight certain primitives preferably without redrawing the entire detector geometry. Specifically, I need to mark straws in a drift chamber in order to aid debugging my tracking code. William J. Deninger deninger@uiuc.edu
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