How can I convert this Polyface Mesh into a tin?

[Anonymous]

I have a survey file that seems to have been created in 3ds Max (Don't ask me why).  It has what looks like a surface in it, but is actually a 'Polyface Mesh'.

I followed the suggestion here but it says 'Not a valid object type' when I get to CONVTONURBS .

Does anyone have any ideas how I can convert this into a C3d surface?  There is data in the file in the form of text with blocks at the spots, but that doesn't help me much if I can't export them to xml or convert them to C3d points.  I also tried Import Survey Data > Import Points From Drawing but it won't select any of the points I need...

File is attached if anyone can help me out.

[Jeff_M · Accepted solution]

Select the polyfacemesh, EXPLODE, create a surface, under the definition find Drawing objects, add 3dFaces, select the 3d faces created by the explode.

[Anonymous]

Thanks Jeff, I knew it would be simpler than I thought 🙂

[Jeff_M]

You're welcome. I should note that you could also just omit the Explode part and use the mesh itself by selecting the polyface option.

[jgrande26]

I have a DXF with four polyface meshes in it. When I tried to add each mesh to my surface, only the smallest one actually made it into the surface. The other three needed to be exploded and added as 3D faces. I don't know why. But, at least I have a surface I can work with now. Thanks.

[Yzne_]

Now you can use polyface to create the surface instead of 3D faces which will not work with meshfaces now on the 2023 version as I have tested.

Thank you!