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General / Problems meshing details well represented in dense cloud

« on: April 12, 2021, 06:28:34 PM »

Using Metashape Pro version 1.7.2.12065, I have produced a model from 334 images of an object shot on a turntable. The item is a metal sculpture of a viking ship and several details - in particular narrow cords and a small flag on top - are missing from the mesh despite being well represented in the dense cloud. After many trials I used the "Interpolation: Disabled" setting and was able to retain these features in the model. However, then I was unable to build a texture for the model and the program froze completely on several operations, including "Close Holes" and while parametrizing the texture atlas. I gather this is because the disabled interpolation causes a messy mesh with many disconnected parts, but I don't know how to get around it since the other options miss crucial parts of the dense cloud.

I have tried resizing the region to make a mesh of only the omitted details thinking I would combine the two meshes. However, with interpolation enabled it still fails to model these areas. I tried to use "Merge Chunks" to combine the large interpolated model with the small model of the detail using disabled interpolation (checking "Merge models") but the resultant merged chunk does not contain any 3d models, only the cameras.

Apart from failing to recreate these portions of the object, the program does a very good job with interpolation enabled and generates the texture perfectly - so I hope there is some solution. I don't have the skills to recreate these portions in an outside modeling program and this would be far less desirable than simply modeling them in Metashape, but I am also open to suggestions in that direction.

Thank you very much for considering my problem. Following is the log info for the two chunks I tried to combine:

For the chunk with the small “detail” non-interpolated model (428,134 faces):

General   
Cameras   334
Aligned cameras   334
Coordinate system   Local Coordinates (m)
Rotation angles   Yaw, Pitch, Roll
Point Cloud   
Points   424,271 of 528,804
RMS reprojection error   0.156836 (0.836528 pix)
Max reprojection error   0.502332 (28.1294 pix)
Mean key point size   3.99739 pix
Point colors   3 bands, uint16
Key points   No
Average tie point multiplicity   3.20533
Alignment parameters   
Accuracy   Highest
Generic preselection   No
Reference preselection   No
Key point limit   100,000
Tie point limit   12,000
Exclude stationary tie points   Yes
Guided image matching   Yes
Adaptive camera model fitting   Yes
Matching time   6 hours 18 minutes
Matching memory usage   2.92 GB
Alignment time   1 minutes 45 seconds
Alignment memory usage   518.67 MB
Software version   1.7.2.12065
File size   38.64 MB
Depth Maps   
Count   334
Depth maps generation parameters   
Quality   Ultra High
Filtering mode   Disabled
Processing time   1 hours 44 minutes
Memory usage   20.51 GB
Software version   1.7.2.12065
File size   4.84 GB
Dense Point Cloud   
Points   156,411,400
Point colors   3 bands, uint16
Depth maps generation parameters   
Quality   Ultra High
Filtering mode   Disabled
Processing time   1 hours 44 minutes
Memory usage   20.51 GB
Dense cloud generation parameters   
Processing time   3 hours 25 minutes
Memory usage   98.59 GB
Software version   1.7.2.12065
File size   2.78 GB
Model   
Faces   428,134
Vertices   413,565
Vertex colors   3 bands, uint16
Depth maps generation parameters   
Quality   Ultra High
Filtering mode   Disabled
Processing time   1 hours 44 minutes
Memory usage   20.51 GB
Reconstruction parameters   
Surface type   Arbitrary
Source data   Dense cloud
Interpolation   Disabled
Strict volumetric masks   No
Processing time   2 minutes 30 seconds
Memory usage   6.71 GB
Software version   1.7.2.12065
File size   12.84 MB

For the chunk with the large interpolated model (31,282,279 faces):

General   
Cameras   334
Aligned cameras   334
Coordinate system   Local Coordinates (m)
Rotation angles   Yaw, Pitch, Roll
Point Cloud   
Points   424,271 of 528,804
RMS reprojection error   0.156836 (0.836528 pix)
Max reprojection error   0.502332 (28.1294 pix)
Mean key point size   3.99739 pix
Point colors   3 bands, uint16
Key points   No
Average tie point multiplicity   3.20533
Alignment parameters   
Accuracy   Highest
Generic preselection   No
Reference preselection   No
Key point limit   100,000
Tie point limit   12,000
Exclude stationary tie points   Yes
Guided image matching   Yes
Adaptive camera model fitting   Yes
Matching time   6 hours 18 minutes
Matching memory usage   2.92 GB
Alignment time   1 minutes 45 seconds
Alignment memory usage   518.67 MB
Software version   1.7.2.12065
File size   38.64 MB
Depth Maps   
Count   334
Depth maps generation parameters   
Quality   Ultra High
Filtering mode   Disabled
Processing time   1 hours 44 minutes
Memory usage   20.51 GB
Software version   1.7.2.12065
File size   4.84 GB
Dense Point Cloud   
Points   156,411,400
Point colors   3 bands, uint16
Depth maps generation parameters   
Quality   Ultra High
Filtering mode   Disabled
Processing time   1 hours 44 minutes
Memory usage   20.51 GB
Dense cloud generation parameters   
Processing time   3 hours 25 minutes
Memory usage   98.59 GB
Software version   1.7.2.12065
File size   2.78 GB
Model   
Faces   31,282,279
Vertices   15,658,885
Vertex colors   3 bands, uint16
Depth maps generation parameters   
Quality   Ultra High
Filtering mode   Disabled
Processing time   1 hours 44 minutes
Memory usage   20.51 GB
Reconstruction parameters   
Surface type   Arbitrary
Source data   Dense cloud
Interpolation   Enabled
Strict volumetric masks   No
Processing time   54 minutes 26 seconds
Memory usage   72.75 GB
Software version   1.7.2.12065
File size   716.27 MB