let's say I have a tube attached to a wall and to a machine.

I have the endpoints, say

#declare tube_end_1=<0,2,0>;
#declare tube_end_2=<1,1,0>;

now I guess I would need some initial vectors for the tube, say,

#declare tube_vector_1=<0,-1,0>; //straight down
#declare tube_vector_2=<1,0,0>;  //left

Now I guess I would need a "stiffness" constant, and perhaps the 
"stretched out" length of the tube


Has anyone got these calculations/ideas/whatever?

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