Line segment sphere intersection test c++ [duplicate]

This question already has answers here: 开发者_高级运维 Closed 11 years ago.

Possible Duplicate:

Testing for ray-sphere intersection

Hi There,

My maths has gotten a little rudimentary, how would I code a line segment / sphere intersection test? Thanks in advance!

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Point-Line Distance--3-Dimensional. Sphere intersection test results obviously from it.