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Random Co-Ordinates

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In a thread that many of you may or not seen, I am having problems producing random co-ordinates for use within a vertex buffer. I tried srand and FLOAT(rand() % x + a) but the result of this is simply an integer, and nothing shows up in the program. I need to get a random float number, or can someone else suggest a way and means to store the co-ordinates used by vertex buffers.

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