connect points to smooth surface

[zbaizhik]

Hello Everyone! 

I am trying to make an imperfect (surface is not smooth) 3D shell in Autodesk to import it in Parts in ABAQUS. 

First, I imported my points in Autodesk and connected points to the surface. After that, I extracted the solid from the surface to make it in 3D via thickness. But unfortunately, when I imported this file to Abaqus, my parts looked weird. I am attaching the file on how the 3D shell should look in ABAQUS. 

I guess that my problem is when I connect all points to the surface, Autodesk is not reproducing the smooth surface. It connects every point with each other. 

Can you please help me with it? 

Thank you 

[tcorey]

I am unclear what you're going for here, but I advise you to look at the _AeccExportSurfaceToSolid command and see if those results will work for you.

[ChrisRS]

A point file and/or drawing would help.
Is Desk 1.PNG a top view?
This looks like points on a hemisphere. If you are showing points on both the upper and lower surface, C3D will try to connect them. Undercut surfaces are supported.

[zbaizhik]

Yes, you are right. It is a hemisphere. 

How can I connect them to make a smooth surface? 

Thank you

[ChrisRS]

This is difficult without points or drawing information.

It appears that your hemisphere is tilted.

Consider a globe as a model of the earth. Ignore tilt. The equator splits the globe into the northern and southern hemispheres. If the globe is transparent, and you look down from the top, you will see points on both the northern (top) and southern (Bottom) hemispheres.

That is what C3D is doing. When you create a surface from your points, C3D, working from a top view, creates TIN lines choosing points closest to each other. The distance between the projected points in the XY plane determines "closest." Z does not matter.

A TIN line can be created between points in the upper hemisphere and the lower hemisphere.

That is what you are seeing.

If you can figure out how to select just northern hemisphere points, including those on the equator, C3D can model the upper surface.

You can then select just southern hemisphere points, including those on the equator, and have C3D model the lower.

These surfaces need to be on different sites and cannot be joined.

If you are working with an actual hemisphere, you are probably better off with core AutoCAD 3D objects.

I hope this helps.

Good luck!