Configuring the VG to VG Relationship
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Create a “Vector Group to Vector Group” relationship and select the primary Points to Surface Face relationship auto-vectors as the primary input and then select the secondary Points to Surface Face relationship auto-vectors as the secondary input.
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Open the properties for the VG to VG Relationship and set the proximity parameters as desired. The vectors in the first vector group will be used for reference and the closes (radial) corresponding vector will be found from the corresponding vector group. Also ensure that the Opposing Direction radio button is selected. Same Direction should be used when comparing points on the same surface.