Elance Exams Answers PDF file

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If a coordinate system (CS1) is transformed to another coordinate system (CS2) using a matrix M, is it possible to go from CS2 to CS1 and how?

No, once a coordinate system is transformed, it cannot be reversed.
Yes, apply inverse of M.
Yes, call glReversCS() with CS2 and M as parameters.
Yes, apply M again.
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