Draw on top of a viewer3D object

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Reza
Reza 2024-2-14
回答： Reza 2024-2-16
In an app created with app designer, a panel is the parent of a viewer3D object, and the object displays a mesh. I want the user to be able to "draw" a polygon on the object with mouse click and select a set of vertices.
The problem is that appearently I cannot "draw" anything on top of the viewer3D object; so I can't show the user the lines they draw. Any axes I create will be masked by the viewer3D, even when I set the appropriate ui stacking. What should I do?

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Reza
Reza 2024-2-16
I tried a coulpe of ideas to draw on top of the viewer3d object but none work. The only way I can think of is to get an image screenshot of the viewer3d (as discussed in this thread)
frame = getframe(viewer.Parent);
then set the visibility of the viewer3d off, use the captured image instead, and so on.
But this doesn't seem like a convinent method. I would appreciate any suggestions.

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