Generating 3d body mesh from pointcloud

Support
1

I have several pointcloud files consisting of x, y, and z points associated with a human body. What I’d like to do is generate a 3d mesh of this body from the pointcloud. Is this possible, and if so what filters should I use? I tried using SurfaceReconstructionFilter, ContourFilter, and ReverseSense together (as in the SurfaceFromUnorganizedPoints example) but the result looks very blocky.

2

Check out this example on how to reconstruct a surface from points: recosuface.py
In the example:

  1. An object is loaded and noise is added to its vertices.
  2. the point cloud is smoothened with MLS (see moving_least_squares.py)
  3. clean() imposes a minimum distance among mesh points where tol is a fraction of the cloud size.
  4. a triangular mesh is extracted from this set of sparse points, bins is the number of voxels of the subdivision

recosurf
recosurf.jpg1194×300 152 KB

3

The VTKExamples Project has three algorithms to generate meshes from point clouds:

https://lorensen.github.io/VTKExamples/site/Cxx/Points/ExtractSurface/

https://lorensen.github.io/VTKExamples/site/Cxx/Points/PoissonExtractSurface/

https://lorensen.github.io/VTKExamples/site/Cxx/Points/PowercrustExtractSurface/

and this one compares the three techniques:
https://lorensen.github.io/VTKExamples/site/Cxx/Points/CompareExtractSurface/

4

Can you share the original point cloud?

5

I’m not using vtkplotter - I’m using the standard VTK python bindings. I’m not sure how vtkplotter works, but I need to embed this in an application so I’m not sure it’s suitable…

6

Those use VTK Remote Modules, and I’m using pip to install VTK for use with a Python project. Do I need to build VTK manually to make use of those modules? That wouldn’t be ideal, as this tool is intended to be used by other users.

7

if you want to avoid dependencies from vtkplotter in your application you can grab the python code from here.
This is based on the vtkExtractSurface class mentioned in the VTKExamples Project.

8

One of the generators is in vtk proper.

9

Hi,
Can you tell me if vtkPoissonReconstruction or vtkPowerCrustSurfaceReconstruction exist in the python 3 version of vtk? I get a message saying that they don’t exist in my vtk version (8.1.2 for Python 3.6 and Python 3.7). vtkSurfaceReconstructionFilter and vtkExtractSurface are there.
Cheers,
Michael