RE: Passing in Point3D with late binding

[quote user="Mark Smith"]My understanding is that Point3D is 3 doubles in sequence[/quote]

More correctly, a User Defined Type (UDT).  You'll find it in VBA help.

[quote user="Mark Smith"]I'm not sure if .Move is expecting the actuall values, or a reference to them[/quote]

UDTs are always passed by ByRef, which is VBA's default.  If you attempt to pass a UDT ByVal, you get the error message you see.

[quote user="Mark Smith"]Any suggestions [/quote]

Rather than

Dim mPt(0 To 2) As Double

You could define your own UDT (but I don't know if that will fool VBA)...

Public Type myPoint3d
 X As Double
 Y As Double
 Z As Double
End Type