[abenedik]

The MathUtils.RayPlaneIntersection can be used to calculate an intersection point of a ray (can be created from mouse position and camera orientation) and a 3D plane - for example if you have a plane with normal (0,1,0) and a position (0,0,0) then you can use that method to calculate where the mouse hits this plane.

You can also see an example in the Ab3d.PowerToys main samples - check the "Cameras/Mouse 3D ray sample".


I am afraid that it will not help you in your case.