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SetViewVector parameter?

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The function takes 3 3D points, called location, target, and up. My guess would be that "location" would be the location of the virtual camera and "target" would be where it is aimed. But I can't then figure out what the purpose of "up" is, nor how to set it's parameters. Seems like location and target would tell all the info needed. Where have I misunderstood?

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