Autodesk ObjectARX

[#1]

Hi,

I am assuming that you have enough information on how those points are inter connected.

If so, then you could first create a subDMesh and then convert it to a surface.

To create a SubDMesh from a set of points, you can use the AcDbSubDMesh::setSubDMesh method.

It expects the vertices and face information in a certain format which is explained in this Devblog post :

http://adndevblog.typepad.com/autocad/2012/04/working-with-vertices-edges-and-faces-of-a-subdmesh.ht...

After you have created the subDMesh, use the AcDbSubDMesh::convertToSurface method.

[#2]

no,it just e a set  of sactter points ,using the points to reconstruct the surface of  3D entity .

thank you

[#3]

Here's some code (in .NET) to create a triangulated surface from a set of points in case that helps - http://through-the-interface.typepad.com/through_the_interface/2009/07/triangulating-an-autocad-sub-....

Although it sounds like you may actually want a 'shape extraction' algorithm to detect planes etc. from a  set of points with random scatter. I don't have an algorithm for that at hand.