Get mouse coordinates in 3D view
To switch from pixel mouse position on the screen to 3D coordinates in V3d_View, use the Convert method from V3d_View.
For example:
	Handle(V3d_View) aview;
	aView->Convert(Xp,Yp,X,Y,Z);
where Xp, Yp are the mouse coordinates in pixels and X,Y,Z the real coordinates in 3D space.
For more information, refer to the entry for this class in the reference documentation.