Texture fusion implementation

[sandyflute]

Thanks for implementing color map optimization. It is an excellent offline method and improves texture mapping outputs drastically. I was looking at online methods and I found this paper texture fusion which also has promising results and works in real time. Here is the Paper and the Code . This will be a great addition to the RGB-D scanning pipeline. It build on top of voxel hashing paper. Can this be implemented in Open3D ? @yxlao @ssheorey