3D mouse position using a "virtual" plane

[ShimShamSam]

The current mouse picking tutorial only deals with picking objects from the scene. Often, when getting the 3D mouse position, you only want to get the point at which the mouse ray intersects a ground plane. I could manually create a ground plane and use intersectsWith, but it seems inefficient to create a mesh for the sole purpose of detecting the mouse position. Other 3D engines I have worked with allow creating a plane without actually attaching it to the scene. The calculation would still work because all of the transform data is there. Is there a way to do this? My current solution is to create a "ground" plane and set isVisible to false, but this seems hacky especially since there seems to be a limit to the size of ground.

[GameMonetize]

This is the right way to do that. The plane will available for picking but ignored by the scene