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Quick Billboarding Question

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Hi there all, on they have a small billboarind tutorial. I don''t understand what they mean when you are supposed to multiply by the size A = PT + ((-Right - Up) * Size) B = PT + ((Right - Up) * Size) C = PT + ((Right + Up) * Size) D = PT + ((-Right + Up) * Size) is that cross or dot product or simply multipling each componet by the size?

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