HOWTO create 3D TIN
This is a micro-howto about how to create 3D TINs from 3D vector points. The resulting TIN is saved as a DXF file, that can be imported into GRASS or used with CAD programs.
- NOTE: this was only tested on Linux machines!
1 - Export your 3d points as a VTK file;
2 - In Paraview, open the vtk file, click on Apply, then go to Filters-Alphabetical-Delaunay 2D (need to click apply again). click on the name of the just-created mesh and go to file-save data. Save it as a PLY file.
3 - Open the PLY in MEshLab and save as a DXF. If you open the dxf in a text editor, you will see the lovely 3DFACE. :)
If imported it back into GRASS, it will be imported as FACES.