Have mentioned edge artefacting and this related problem has also been annoying since pix4d released.
Most buildings have roof that extend a portion beyond its walls and pix4d handles these surfaces terribly in DSM generation and orthomosaic. It seems the software tries to directly triangulate the roof with the terrain below and it results in an extremely jagged edge that is very visible in the end product.
There is a labor intensive workaround to manually draw surfaces or edit in orthomosaic editor but this problem really should have been adressed by now.
It cant be that hard to instruct the software to prioritize the higher surface and edge detection should be possible to further improve these results.
Product development seems to have grinded to nothing except a few minor bug fixes.
The maintenance fee seems to add no value for the costumer.