screen space offset or custom line anchor (for Projected3DLabel)

[anne-gropler]

The position of a Projected3DLabel is given in 3D world space (using World unit) while the font size and direction are given in screen space (using Pixel unit).

A position offset (or a custom line anchor, that also allows x-offset) could help to position such a label more precisely in the screen space. Currently, an application would have to use a dynamic Position2DLabel and update its position manually (i.e., the application calculates position in world space to screen space) with every camera change.