The "nearly" OpenGL coordinate system is quite tricky when it comes
to absolute positionning.
The attached compo will do the job you're looking for
It looks a bit heavy for such a common task, but to that's the best
way i've found.
Another thing you can do is use the 3D Transformation macro patch to
translate everything by Witdth / 2 and Height / 2 to put the
referential origin at the lower-left corner for example
Then put your Sprite and Billboard patches inside 3D Transformation
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