Scale Distortion in LAS and OBJ Exports with 'Project Output' Coordinate System WGS 84

General Feedback & Requests
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1

Hi everyone,

I’ve encountered a scale distortion issue when exporting LAS and OBJ files :

The Problem:

When exporting files with the ‘Project Output’ coordinate system selected, the exported files have significant scaling problems when imported into other software like Vectorworks or Blender:

  • The X and Y axes are too small by a factor of 100.
  • The Z-axis is too large by a factor of 1000.

Interestingly, when I select the ‘Grid Plane’ coordinate system instead, the exported files work perfectly without any scaling issues.

My Setup:

  • Application Settings: Both input and output are set to WGS 84 to match DJI drone system.
  • Export Formats: LAS and OBJ.
  • Location: Australia (not sure if this affects the outcome due to CRS specifics).

My Questions:

  1. Has anyone else experienced similar scaling issues with the ‘Project Output’ coordinate system?
  2. Is this a known issue with RealityCapture’s handling of coordinate transformations during export?
  3. Are there specific settings I might need to adjust to avoid this distortion when using the ‘Project Output’ option?

Thanks in advance for your help!

2

Hi Fred
I suppose the biggest issue there will be the used coordinate system, as WGS is mostly in degrees and at least Blender uses metric system for the coordinate system. So, this could cause the disproportions of your model (as degrees are considered as millimetres).
This confirms the used grid system, which is in metres in RealityCapture.
To use your model as georeferenced, you can use some other metric system, which is applicable to your country (some of the UTM systems). But there could be also the problem with the big coordinate’s values, which some of the applications don’t like too much.

3

Hi Otrhan,

Thanks, you were right. I have change the output system to GDA 2020 and it has solve the issue.