Messages

1

Bug Reports / Laserscan Mesh/Tiled Model with Texture

« on: March 08, 2023, 04:45:24 PM »

Hello,

we are trying to process some laserscan data (structured laserscan data) using the newest iteration of Metashape.
While the model creation seemed to work, we were not able to create the textures, neither for the simple mesh nor for the tiled model.
We are not using any additional photos, just the laserscan data which includes the RGB image + depth map.

It is urgent and help is super appreciated! 

Best regards, Kreshi


EDIT: Sorry I think the question should be put to the general forum by a mod - looks like I posted it in the bug reports by mistake.

EDIT 2: With the latest 2.0.1 version it worked! Just one thing though: For laserscan projects, the mosaic method for texturing works very bad - even average works better. For tiled model generation this setting has been disabled which complicates our workflows now.. For laserscanning we recommend Agisoft to write a new blending method more specialized for spherical-projections which values distance to the projection-sphere more than it currently does.

2

Bug Reports / PhotoMesh Layer Tiled Model Export Accuracy Issues

« on: February 13, 2023, 07:53:34 PM »

Hello Agisoft Team,

the export of tiled models in the PhotoMesh Layer format seems to have huge accuracy issues which increase with the size of the reconstructed terrain.
We exported terrains with the size of >2km as tiled models and as textured models and overlayed them for comparison.
While the 2 reconstruction methods match perfectly inside of Metashape, the export of the tiled model as PhotoMesh Layer is very imprecise (I am talking about geospatial precission when measuring points in the projected coordinate system). The export of the textured modes is correct and exact and the coordinates match to the ones in Metashape.
The inaccuracys vary and can be >4m.
The accuracy issue is not a constant offset, but it seems to involve scale and rotation as well.
We assume that the transformed vertices in their respective coordinate system must create the issue on export of the PhotoMesh Layer format since inside of Metashape the coordinates are exact.
We are using Metashape version 2.0.0 (15597).

We wrote a 3-point alignment solution to align the tiled model data to the underlying textured model however even with this approach we still had bending issues and couldn't bring the precission down to what is required.