[vtkusers] Point picking callback not giving accurate points in pcl viewer

[Jyoti Dubey]

Hi,
I am trying to draw a cuboid in pcl viewer by clicking two diagonal points
in pcl viewer.The callback function does not return the accurate points
sometimes hence in certain cases either the cuboid drawn is larger than
required or the cuboid is shifted and doesn't get drawn at clicked points.

Could you please let me know what can be the issue and how to resolve it.

Thanks and Regards,
Jyoti Dubey
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