• Ref. Geometry >> Create >> Coordinate >> Pick Origin & X, Y Direction command creates a reference coordinate from a selected( picked ) point on a shell and two selected points.

Step   

Execute Ref. Geometry >> Create >> Coordinate >> Pick Origin & X, Y Direction command as follows:

1. Select Ref. Geometry >> Create >> Coordinate >> Pick Origin & X, Y Direction from the menu or click the corresponding icon from the Reference toolbar.

2. Select( Pick ) a point on shell to be the origin.( See Selecting point )

3. Select a point on shell to specify the X direction and another one Y direction.

During picking points,  User can select point entity on RMB menu as below fig.

 

Point : Any point on polygon face

Vertex : Scanned point

Ref.Point : User made Ref.Point 

Point On Surface : any point on NURBS surface

Point On Curve : any point on NURBS Curve

• Point on Surface option cannot be applied to surfaces without mesh or if rendering never been executed once. Because picking point algorithm uses rendering information. So Point on Surface option can be applied to TRUE COLOR display mode with rendering information only.