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11.6.3 Global self-intersection of pipe surfaces
In this section we will consider how to find the maximum possible
radius of a pipe surface such that it will not self-intersect in a
global manner. Global self-intersection can be categorized
into three types [256].
End circle to end circle: Two end circles of the pipe
surface touch each other.
Body to body: Two different body portions of the pipe
surface touch each other.
End circle to body: One of the end circles touches the body.