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Hello and thanks for your feature requests.
SDV xform does not have a feature that calculates the UV angle. What you are refering to is the pivot calculating system (which places the rotational pivot where the user wants it). This feature will not be added, as the current rotate features already allows the user to rotate around a custom pivot: All you need to do is press "D" and move the manipulator pivot where you want it (with or without snapping); and the next time you rotate the rotation will be around the pivot. This works with all transform modes: scale, rotate, translate - neither does matter as the rotate features always rotate around the current or last pivot.
However I am considering adding a feature that calculates the angle between two UV's based on the arc tangent, and then add that value to the value input field.
And regarding the texel density feature: Several other people have requested the ability to store TD values - so this is something that will be implemented.
lacio drom
Comments on this feature request:
Martin Dahlin said over 11 years ago: