Many surfels are like spikes

[CanCanZeng]

I used the code in issue #55 to check the model generated by 2D-gaussian-splatting, and found that it has a common feature with the result of 3DGS, that is, many primitives are like spikes, rather than more intuitive ellipses. I don't know if the authors has discovered this phenomenon. I wonder if we can add a length-to-width ratio constraint to the scales of gaussian, which may lead to better reconstruction of the scene.

[hbb1]

I think it will. I construct an extreme case.

without constraint

with constraint (su==sv) (isotropic surfels)

You can see that the distribution of isotropic surfels looks better. and there are less artifacts near the arm of the chair. Although such constraint may harm the PSNR, it has the potential to improve geometry. Or some soft constraints as you mentioned can be used for further trade-off. This is from my thought, not experimentally validated. Feel free to discuss.

[CanCanZeng]

Your experimental results are very encouraging, and I think we can delve deeper into this area