[VBA] How to get the point projected to a bsplinesurface?

Question

I have a bsplinesurface and a point3d below bsplinesurface. I want to get the point projected to the bsplinesurface with vba. I tried some way. 
 1, projectedpoint=bsplinesurface.ProjectPointOnPerpendicular(point3d, Matrix3dIdentity) 
 I get a error after running it. 
 2, point3d()=bsplinesurface.GetIntersectionPoints(lineelement, Matrix3dIdentity) 
 I get a many points, but it is not a point that I want. 
 3, point3d() = bsplinecurve.IntersectSurface(Parameters, SurfaceParameters, BsplineSurface) 
 I get a error after running it. I guess that I made a mistake. I don't know what I have to give as Parameters and SurfaceParameters... 
 
 Can someone tell me the good way?

Tuan Le · Accepted Answer

There's an example in the VBA help file titled Compute the Projection of a Point onto a B-spline Surface and it doesn't use the ProjectPointOnPerpendicular method. See if that helps

[VBA] How to get the point projected to a bsplinesurface?

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