3D construction and texturing is not right.

[sbasnagala]

I have successfully run the Meshroom, but resulted obj file seems not right. It is supposed to be a beetle, but it lacks the basic structure. I had 169 resulting stacked images in Meshroom to run the model. 10 images out of 169 had no solid background. Any idea what's happening ?

[mnhn-paul]

@sbasnagala The cameras seem to be aligned correctly. did the dense point cloud calculate correctly? I think this might be an issue with your Meshroom workflow.

you might have more luck posting you issue to an Meshroom or Photogrammetry groups on Reddit or so.

[sbasnagala]

I did post in their forum. Thanks

[sbasnagala]

Hi Fabian!

During one of the discussion, you mentioned....

"Keep in mind that you may need to adjust further parameters to fit your images, such as the min/max threshold values, as well as CLAHE settings, the same way you would in the scAnt GUI."

Could you tell me where exactly I can change these settings? Thanks sbasnagala

[FabianPlum]

Hi Suranga,

There are three ways in which you can adjust these values:

• in the GUI (BEFORE scanning) : the values can be changed in the scanning settings
• in the config file (BEFORE scanning): make changes to the mask_thresh_min / mask_thresh_max values in the config file and load it as a preset before starting a scan
• as a post-processing step (when running masking): when running the command line version of the masking script you need to define the mask_thresh_min / mask_thresh_max as well as CLAHE values directly. The darkest background pixel value across your RGB channels is the mask_thresh_min value, and the brightest is the mask_thresh_maxvalue. Your CLAHE value should be chosen based on how clearly separated your specimen is from the image background. Use low values (1 to 3) for well-separated fine features, and high values (3 to 10) for less sharp coarse features.

e.g:

python mask_generator.py --images "PATH_TO_YOUR_STACKED_IAMGES" --CLAHE 3 --mask_thresh_min 175 --mask_thresh_max 215

All the best Fabi

[FabianPlum]

As the questions are no longer related to the use of Meshroom and I cannot give specific advice with third-party software I will need to close this issue here. Feel free to open a new issue with further questions relating to the scanning process itself!