Surface/Mesh from polylines

[novais]

Hello, i have in the example attached, 10 polylines with 2m increment in Z and a surface that i've created some years ago with those polylines. The problem is, for some reason i've completly forgotten how i achieved that result wich consists in a rather simple surface composed by triangles. I'm pretty sure that i've used a mesh to do it, but now, i'm struggling to do it. Even if i loft it with the ruled option, it doesn't create those simple triangles...

Can anybody help me with this?

Thank you all.

Nuno

[leeminardi]

What is your final goal for the file and why do you want triangles?

TINs (Triangulated Irregular Networks) are often used to define terrain in civil and architectural applications. Autodesk's Civil 3D has features for creating TINs from contour lines.  

[Patchy]

Plain Autocad you can use Triangulation

[leeminardi]

@Patchy  I am using plain AutoCAD 2019 and cannot find the ribbon and the triangulate function. What ribbon is that in your screenshot and what is the direct AutoCAD command to bring up the dialog box you show?

Thank you,

Lee

[Patchy]

I saw it here, it shows plain Autocad. I don't have other than 2008.

https://www.youtube.com/watch?v=-yp5LXTi-84

[R_Tweed]

This screen shot shows that promine essentials has been installed.

[Patchy]

How about this one?

https://knowledge.autodesk.com/support/autocad/learn-explore/caas/screencast/Main/Details/6f038979-5...

[R_Tweed]

Create your mesh and then use the meshoptions command which will bring up the mesh tessellation option dialog box.  There is a mesh type pulldown to the right of mesh type.

[leeminardi]

I got the following:

[R_Tweed]

Looks like we overlapped in our responses. Interesting that meshoptions is not on the ribbon. This is a good example that not everything is available through the menus.  It's just good practice to learn the commands and options.

[novais]

Thank you for the tip!

From what see from your picture, it seems that the mesh creates 4 triangles in the same space that in my surface only creates 2 triangles.

Is it possible to tweak the options to do it creating only 2 triangles?

Thanks!

[R_Tweed · Accepted solution]

The file opens in 2013 format and the object is a surface not a surface (loft).  I was able to get a very simliar result setting surftab1 to the 100 and use rulesurf, then convert the resulting mesh into a surface which gives you that distinctive look.  Once you have converted the meshes to surfaces you can then union each row into one surface. The small division that you see is from the isoline setting of 6 in both directions.