AutoCAD 2010/2011/2012

AutoCAD 2010/2011/2012

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Active Member
yigit2124
Posts: 6
Registered: ‎12-15-2012
Message 1 of 7 (866 Views)

How to split a solid object into a group of 3d polygon meshes

866 Views, 6 Replies
12-17-2012 12:57 AM

Hi everybody, I drew a solid model of a structure in Autocad 2010. By using that model, I want to make a FEM analysis in Sap2000. The problem is that Sap2000 takes only polygon meshes (not solids) in 3d. The question is that how can i make a group of polygon meshes of the solid model that represents the structure.

 

(Since i am not an expert of Autocad, i will be glad if the solution is explained in a simple language.)

*Expert Elite*
Alfred.NESWADBA
Posts: 8,983
Registered: ‎06-29-2007
Message 2 of 7 (840 Views)

Re: How to split a solid object into a group of 3d polygon meshes

12-17-2012 03:55 AM in reply to: yigit2124

Hi,

 

try command _CONVTOSURFACE (>>>details<<<) does that help?

 

- alfred -

 

 

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Alfred NESWADBA
Ingenieur Studio HOLLAUS ... www.hollaus.at
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Active Member
yigit2124
Posts: 6
Registered: ‎12-15-2012
Message 3 of 7 (822 Views)

Re: How to split a solid object into a group of 3d polygon meshes

12-17-2012 04:56 AM in reply to: Alfred.NESWADBA

Hi,

Unfortunately, when i use that command, it is said, on the command screen, "object can not be converted". Actually, what i want is to split a 3d solid model into 3d polygon meshes which are components of the 3d solid model.

 

By the way, I want to note that 3d polygon meshes still have volume!

*Expert Elite*
Alfred.NESWADBA
Posts: 8,983
Registered: ‎06-29-2007
Message 4 of 7 (815 Views)

Re: How to split a solid object into a group of 3d polygon meshes

12-17-2012 05:19 AM in reply to: yigit2124

Hi,

 

>> it is said, on the command screen, "object can not be converted"

If that is the answer from the system, then your object is no 3D-SOLID. Can you upload a drawing with at least one of your obejcts that can't be converted?

 

>> I want to note that 3d polygon meshes still have volume!

Sorry, not in AutoCAD, a mesh is like a surface.

 

- alfred -

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Alfred NESWADBA
Ingenieur Studio HOLLAUS ... www.hollaus.at
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Active Member
yigit2124
Posts: 6
Registered: ‎12-15-2012
Message 5 of 7 (807 Views)

Re: How to split a solid object into a group of 3d polygon meshes

12-17-2012 06:34 AM in reply to: Alfred.NESWADBA

Hi again,

I attached two files. The file named "3d_polygon_mesh.dwg" includes a model composed of 3d polygon meshes which i want to make from a 3d solid object.

The other file named "my_model.dwg" includes my structure(3d solid).

 

By using the model in the 2nd file, how can i form 3d polygon meshes that represent my structure?

*Expert Elite*
Alfred.NESWADBA
Posts: 8,983
Registered: ‎06-29-2007
Message 6 of 7 (798 Views)

Re: How to split a solid object into a group of 3d polygon meshes

12-17-2012 07:51 AM in reply to: yigit2124

Hi,

 

Your 3DSOLID can be converted to a surface using the command _CONVTOSURFACE (that creates a surface), then with command _MESHOPTIONS you can convert it to a mesh (see attached DWG)

But without manual construction or development of a tool (imho) you can not create laminates like you showed in your drawing and you can't create box-like structures like you showed.

 

I'm no user of FEM-products and so my knowledge is close to zero, but I'm wondering that there is software doing FEM but not doing it's own meshing (as the meshing always has to be optimized by the product because of calculation-times)? Just wondering ... :smileywink:

 

Sorry to be not more helpful, - alfred -

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Alfred NESWADBA
Ingenieur Studio HOLLAUS ... www.hollaus.at
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Active Member
yigit2124
Posts: 6
Registered: ‎12-15-2012
Message 7 of 7 (794 Views)

Re: How to split a solid object into a group of 3d polygon meshes

12-17-2012 08:18 AM in reply to: Alfred.NESWADBA

Actually, Fem softwares are doing their own meshes. The reason why i am doing that in Autocad is that the drawing phase of the model in Autocad is easier compared to them.

 

Thx for all your effort !

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