Corners are inserted in the output mesh even if they are no data values

[salvioli]

I tried to transform a DEM from HiRise data which is distributed as GTiff format. The input DEM is available here.
This file includes several no-data value points which include the four corners of the raster DEM and dem2tin seems to add to the output obj the four corners even if these are no-data values.

The following is the output of the program after processing the DEM:

[fester]

Insertion of vertices in place of nodata pixels at corners is a part of meshing alorithm and can't be fixed withou making significant changes to it. There's no easy way to solve this, simplest way may be just rotating the raster.

[salvioli]

Sorry for bothering more on this topic, wouldn't we be able to simply post-process the mesh removing all vertices which correspond to no-data values on the raster?