Find Extremity of 3d Solid

Hi Forum,


i have a 3D tunnel Solid that i need to find the edge of. i need to run a line in plan along the edges with the view of finding certain distances from the extremity of the shape. i need a line 500 friom tunnel, 3000mm from tunnel, etc.

Whats the best way to create a line along a solid edge and know that line is in fact definitely the outer most line in plan?

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