If your center = [0.5;0.5], then
((UV-[0.5;0.5])*Scale)+[0.5;0.5]
Another words, you just move Center Point to [0;0], scale it and return it to its initial position.
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If your center = [0.5;0.5], then
((UV-[0.5;0.5])*Scale)+[0.5;0.5]
Another words, you just move Center Point to [0;0], scale it and return it to its initial position.