How to reconstruct object only with depth image

[jc-bao]

Hi, 👋 everyone. I am wondering if it is possible to reconstruct objects only with depth images in Open3D?
I have tried to copy the depth image to the RGB image folder to "fake" the RGB image. The result is very wired so I suppose it is not the proper way to do this with Open3D.
Any information will be highly appreciated! Thanks in advance. 😀

initial shape	reconstructed with RGBD image	reconstructed with depth image (use depth to fake RGB)

[jc-bao]

I think the issue can be resolved by first converting the RGBD image to point. Then use ICP and graph optimization to conduct the reconstruction following the pipelines guide.