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city-super / Scaffold-GS

[CVPR 2024 Highlight] Scaffold-GS: Structured 3D Gaussians for View-Adaptive Rendering

Home Page:https://city-super.github.io/scaffold-gs

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Question about anchor adjustment

chenjiajie9811 opened this issue · comments

commented

Hi, thank you for your great work!

With your anchor growing and pruning design, do you think if it exists such a case that all neural gaussians from one anchor will be moved to the voxel of another anchor. In this case you will not prune the first anchor because the opacity values of the GS from that anchor are still large enough. Just like the picture from your paper, there are some anchors floating around the object. Or is this acceptable? Maybe I have understand it wrong, please correct me.
image

Thanks!

commented

Hi, thanks for your interests. This is a good question. And your concern is totally possible. The gaussian density is constrained by the voxel size and n_offsets, such floating anchors may serve as supplementary to those texture-rich area. So, it's acceptable and reasonable to a certain extent. However, it could potentially lead to inefficiencies in managing and allocating the representation resources.