instead of inserting and removing the draggers would a better solution be to 
use the dragger node masks to select which is visible? Then I could have 
dragger 1 at root, dragger N a child of dragger N-1, and then the model a child 
of dragger N.
Would you recommended this solution?

A followon question: if a nodes mask is cleared so it is not rendered, can it 
still be intersected? (I hope not)

Julia

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