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Numerically stable(ish) method of getting Y-intercept of mouse position?

I'm trying to unproject the mouse position to get the position on the X-Z plane of a ray cast from the mouse. The camera is fully controllable by the user. Right now, the algorithm I'm using is... ...

asked Dec 1 '12 at 7:52

Fraser
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Numerically stable(ish) method of getting Y-intercept of mouse position?

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