Quaternion Lookat Fix

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Alex Quach

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Jul 14, 2011, 5:33:09 PM7/14/11
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Attached is the quaternion fix. It addresses issues where the direction happens to be <0, 0, -1>, or the up vector is <0, -1, 0>. If this isn't a problem you are having, then you can probably just wait for the next build :)

Alex
quaternion.em
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