Dim oSurfEval As SurfaceEvaluator
Set oSurfEval = oFace.Evaluator
Dim oParamRange As Box2d
Set oParamRange = oSurfEval.ParamRangeRect
Dim adParamCenter(1) As Double
Dim U As Double, V As Double
U = oParamRange.MinPoint.x
V = oParamRange.MaxPoint.x
adParamCenter(0) = (U + V) / 2
U = oParamRange.MinPoint.x
V = oParamRange.MaxPoint.x
adParamCenter(1) = (U + V) / 2
Dim Origin(2) As Double
Call oSurfEval.GetPointAtParam(adParamCenter, Origin)