Convert from TIN Surface Triangle to close polylines

[soonhui]

Is there anyway to convert from TIN Surface Triangles to close polylines? One Triangle should be converted to one closed polyline. 

Note that this is the complete opposite of what we usually want to do, namely convert polylines into a TIN surface.

[rl_jackson]

XML, maybe

[soonhui]

@rl_jackson , can you be more specific?

[Pointdump]

Hi,
1. Extract TIN Lines from Surface.
2. PEDIT to Convert to Closed Polylines.
3. MAPPOLYLINETOPOLYGON.
4. EXPLODE or MAPEXPORT to Closed Polylines.
Dave

[Pointdump · Accepted solution]

@soonhui,
I did this just now and it works:
1. Extract triangles from surface. You'll get 3D Faces.
2. Use Command REGION.
3. EXPLODE.
4. CONVERT3DPOLYS.
5. Select All and change Closed to Yes in Properties.
Dave