After performing several tests, I notice that the outliers are better managed by using “Build texture” than using “Build Orthomosaic”. There are also fewer disparities in brightness and sharpness.
Also, performance is better with mesh texturing.
It would therefore be nice to have an option to extract an orthomosaic directly from the texture of a mesh (top view, side view, etc.). It is very convenient to make interior orthomosaics, per floor. But currently, the only way to do this is to successively cut the mesh to generate an orthomosaic, which recalculates all the orthoimages at each step, even with same projection. The performances are therefore very poor when what we want is simply a cut of the textured mesh (like a screenshot of the workspace at high resolution, which means it could simply be an option when capturing view).