[vtkusers] render an 2Dimage with depth information

[Yixun Liu]

Hi,
I have a picture obtained by a stereo camera. The depth of each pixel is
known.
I want to render this picture with some virtual objects using VTK

One way is to treat this 2D picture as a vtkImageActor and then render this
actor first, then manually set the depth buffer using the known depth,
finally render other virtual object.

I do not know if VTK has some decent way to do this.

Thanks.

Yixun
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