why invDepth

[ning-zelin]

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Hello, I noticed that the depth regularization in both Hierarchical 3DGSand this project is implemented based on inverse depth. I would like to ask why the absolute depth of the real world is not used and what are the benefits of inverse depth compared to real depth?

[AsherJingkongChen]

I guess that they are mapping the depth (> 0.2) to a lower value for better controls? (< 50).

By the way, the world of splats is not real one, it should be called as "Camera space" instead.

[Zerui-Yu]

Same question, and I've found that inverse depths are near-large and far-large, whereas monocular depth estimates are usually near-large and far-large. Does the loss function really work?