Can any one tell me why the cloud points got from stereo camera(left and right camera images) are only on a flat plat and no depth

Question

Can any one tell me why the cloud points got from stereo camera(left and right camera images) using OpenCv C++ are only on a flat plat and no depth.

side image

frontal image

Answer 1

I was able to resolve the issue. It was due to bad calibration.got better point clouds once the calibration was improved