[vtkusers] How's the Projection Transform Matrix computed in VTK? and Generate Cloud Point From Depth Map Image

[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

On Fri, Oct 19, 2018 at 12:05 PM maskjp <jiangpengyiwu at gmail.com> wrote:

> 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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