merge nodes in autocad 3D

[jordimoreno]

Hi,

 

I am using autocad to do the mesh of finite element model in 3D.

I would like to know if exist some kind of commad/LISP/VBA to merge end of 3DPOLY/SPLINES/ARCS when they are close.

 

The problem arrives when I try to do "EDGESURF" order: I have to select 4 3DPOLY/SPLINES/ARCS , and they have to be connected. In many cases the end of one line and the start of the other seem connected but it is not. I've to do a big zoom and then find which of the four corners is not connected. I think the people trying to do HATCH in 2D find this problem often,too.

 

You can find attached an example showing the problem: The 4 lines determining the EDGESURF are connected in the left figure, but in the right figure at the upper right corner is not connected.

 

So, my request is a type of LISP/VB process where:

- You,select the region affected

- Then you write a tolerance or fuzz distance.

And obtain as result that all the "end or start of 3d linear entities" within a distance between them smaller as the tolerance will merge/superpose in only one.

 

This command/LISP/VB would be very useful, too, to merge 3Dsolids representing membranes or planar surfaces in real planar surfaces with only one click.

 

I think that this would be very helpful and all the Finite Element Modellers in the world will be happy to have.

 

Thanks in adavance.

 

Jordi Moreno Lapiedra

081103_Merge.dwg