Exporting Delaunay triangulated volume to txt


I have generated a 3D volume from a point cloud using the Delaunay 3D filter. I want to export the generated volume as a txt file. I can save the figure as txt file but it only lists the identification number for the points along with their xyz coordinates. Is there any way to generate a txt file that identifies how the points connect to form the tetrahedral elements that form the solid volume?

Not supported by the .csv writer.

However, you can save as an ASCII .vtu file that can be read easily.

I do have one more question about the way this file is structured. I just want to know how the portion for elemental connectivity is written. I know the tetrahedral should have only 4 vertices but six numbers form each line under this category.