This is a [Mixin Interface] returned by some properties of the manip Interface. It provides methods to get intersections with a manipulator plane.
Mixin Interface: (manip.msXYPlane)
Interface: manipPlane Properties:
<MixinInterface:manipPlane>.normal : point3 by value : Read Returns the normal of a plane.
<MixinInterface:manipPlane>.point : point3 by value : Read Return the point that the plane passes through.
<MixinInterface:manipPlane>.planeConstant : float : Read Return the value of the plane constant. This is the value of "D" in the equation that defines the plane:
Ax + By +Cz + D = 0
Methods:
<boolean><MixinInterface:manipPlane>.intersect <ray by value>ray <&point3>intersectionPoint
intersectionPoint is In and Out parameter Intersects the given ray with the plane. Returns true on success. The intersection point is set in the "intersectionPoint" value passes by reference, which must be initialized to a Point3 value in advance.
<Interface><MixinInterface:manipPlane>.mostOrthogonal <ray by value>viewDir <Interface>plane Returns the plane that is most orthogonal to the given ray. This means the plane that is most "square" to the view direction.