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Article Data
Article Ref
9627-QEDF-8411
Date Created
Fri, 12th Jun 2015
Date Modified
Fri, 12th Jun 2015

   Multi-sensor alignment issues

Question 

I'm having alignment issues with my multi-sensor system. What should I do?

Answer 

If there is not enough overlapping data from one scan to the next, KScan3D won't be able to properly align a mesh to a previous mesh. This can be caused by any of the following reasons:

  • If your computer isn't fast or powerful enough, it may not be able to capture overlapping scans as quickly as it needs to. Make sure your computer meets the minimum hardware requirements. Also be sure you've set Generate to Capture Only.
  • If the turntable is rotating too quickly, there may not be enough overlap from scan to scan. If possible, adjust the turntable's rotation speed to a slower setting.
  • If you are scanning a person, and he or she is wearing clothes or holding props that can't be properly scanned, there may be too many holes in the mesh for the alignment process to work properly. Try different clothes or prepare props as suggested in Scanning Basics.
  • If the person moves a body part during the scanning process (for example, his or her arm moves or head tilts), either the automatic alignment process may be affected or you'll get inaccurate mesh results. If body part movement is an issue, you can use additional stabilization structures to help the person remain as still as possible. Remember, these objects can be deleted from the scans before finalizing the mesh.

Keep in mind that just because a mesh won't automatically align doesn't mean it is unusable. If you the automatic alignment process fails as the point clouds are being converted to meshes, you can do the following:

  1. Abort the build/alignment process.
  2. Manually align the misaligned meshes.
  3. Combine the meshes.
  4. Continue building and automatically aligning the remaining meshes.
  5. Combine these meshes separately from the previously combined meshes.
  6. Combine this group of meshes with the previously combined group of meshes.
    Depending on your scans, you may need to repeat steps 1-3 for several groups of meshes.