[Fyron]

Originally posted by Member 4148:

quote:

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Originally posted by Imperator Fyron:
y position is not height.

can be - it depends on coordinate system used
there is no particular reason why the center of the sphere has to be the 0 point - he wanted the answer from the bottom of the sphere after all
likewise there is no particular reason why z has to be up, y back, and x right - reducing to circle makes y up using cartesian so it works as height

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No, it doesn't have to be, but it does certainly help if you either stick to a standard coordinate system or define the one you are working in.