Decimation

[Pau]

Hi there, I was just wondering if somebody could tell which are the principles behind the mesh decimation algorithm in photoscan.
Thanks in advance,
Pau

[Wishgranter]

if remember then was mentioned the POISON decmation algorithm..

[Alexey Pasumansky]

Hello Pau,

During decimation PhotoScan merges a pair of neighboring vertices in case the geometry modification is minimal. So plane areas are decimated much more than relief areas. It allows to deliver 3D-model details by significantly lower number of faces.

And what type of objects do you usually reconstruct?

[EvanThoms]

When you go to the decimate mesh dialog, how does PhotoScan arrive at the suggested number of faces? And at this point, when making DEMs, how do I know what the resolution of a resulting DEM will be if I go ahead and decimate to that number?