generate 4 vertices to represent a retangle on z, and be pendicular to the XY plane.
left-bottom -> right-bottom -> right-top -> left-top
half of size on X axe
half of size on Y axe
z
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generate 4 vertices to represent a retangle on z, and be pendicular to the XY plane.
left-bottom -> right-bottom -> right-top -> left-top
Returns