AcGeEntity3d AcGeCurve3d AcGeLinearEnt3d AcGeRay3d
class AcGeRay3d : public AcGeLinearEnt3d;
geray3d.h
Represents a half-bounded line in 3D space. An AcGeRay3 object either has a start point but no endpoint, or has an endpoint but no start point.