DEM resolution

Hello people,

I’m trying WebODM (beautiful) with a set of 42 pics (1280 x 720) and I’m obtening a dsm.tif file of 330 x 285 px. The issue comes when I try to mask the dsm with a polygon shape on QGIS, with the result you can see on teh picture. Then when I try to 3d that clipped mask those zigzag edges produce an awful 3d result.
Any advice on this?
Thanks a lot in advance.


Screenshot from 2020-10-14 13-43-31

I would like to add that I’m able to visualice the dem on the viewer at pretty good resolution and I can even make larger screenshot of the dem but I’m unable to download it properly.