[vtkusers] Generate Cloud Point From Depth Map Image

[maskjp]

depthmaptopointcloud.zip
<http://vtk.1045678.n5.nabble.com/file/t342591/depthmaptopointcloud.zip>

I wrote a code in python to generate a depth map of a 3D model and save it
as an image.
But when I wrote code to generate the point cloud from the image, only part
of the point cloud was generated.

I set the same camera parameters but not work.

I attached the code and 3D model in this post.

Anyone have any idea？ very appreciative.

Thanks!



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[maskjp]

I figure out the problem. When I use the vtkBMPReader, the output of this
class is a 3 channel vtkImageData, but the vtkDepthImageToPointCloud only
receive a 1 channel depth image. So We need to use vtkImageExtractComponents
to get the first channel of the vtkBMPReader output.

But I still don't understand how vtk compute projection transform matrix.



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[Allie Vacanti]

Depending on settings, there are a few ways it can be computed.
vtkCamera::ComputeProjectionTransform is the starting point for tracking
down the specifics:

https://github.com/Kitware/VTK/blob/master/Rendering/Core/vtkCamera.cxx#L1035-L1127

HTH,
Allie

Post by maskjp
I figure out the problem. When I use the vtkBMPReader, the output of this
class is a 3 channel vtkImageData, but the vtkDepthImageToPointCloud only
receive a 1 channel depth image. So We need to use
vtkImageExtractComponents
to get the first channel of the vtkBMPReader output.
But I still don't understand how vtk compute projection transform matrix.
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