Returns FALSE unless intersection is a single point If returned parameter is < 0 or > 1, then the line segment between line.m_point[0] and line.m_point[1] does not intersect the plane 
C#
public bool ON_Intersect(
ref IOnLine line, 
ref IOnPlane plane, 
double% 
t);
Visual Basic
Public Function ON_Intersect(
ByRef line As IOnLine,ByRef plane As IOnPlane,
t As double%) 
As bool
| Parameters | Description | 
| double% t | [out]parameter on line | 
是不是完全相同呢?