Jagged shadow edges on Low Poly models using URP Baked Lighting

I experienced a lot of problems in the past months using Unity's Lightmapping for my big open world scene.
The models are low poly and UV unwrapped by hand(had to because there were problems with automatic UV no matter what the settings were).

The main problem is that the edges where the shadow changes are very, very jagged/blocky. The only way to sort of mask it is by increasing the Lightmap Resolution, but this increases the texture size a lot and that's a problem since I am targeting mobile devices.

This is a 2015 post with a similar problem https://forum.unity.com/threads/jagged-shadows-in-baked-lightmaps-unity-5.317150/










You can check out 1 more example here https://imgur.com/a/DboLsX9.
I couldn't post them here. There is a 5 images limit per post.




This is another problem. I was left with the white smudges today after changing a lot of values trying to solve the problem. Tried reverting to the old settings but now they are here to stay I guess. Welp!!




I am using a directional lighting with: Intensity = 2.96, Indirect Multiplier = 2, Shadow Type = Soft,
Baked Shadow Angle = 5

My Unity version is 2020.1.12f1


Please help. Thank's in advance.

 

UPDATE: The white lines come from the AO. I still need to figure out how to fix this so I can have AO.

 

For the jagged edges the only thing that helped was scaling down the whole scene in half. Now I get a lot better shadows with the lightmap resolution even at 5. I wonder if there is some math I can do to figure out what is the perfect scale.

But the AO white seams still persists. No info on internet and I don't know what to do.

 

@kristijonas_unity Changing the lightmap padding both on model import and lighting settings doesn't help. Same result between 2 and 32 texels.

 

Ok this makes a lot of sense. So the jagged edges happens because texel for blending was put right on the seam which is ok for normal models with smooth geometry.


This is my current progression.

I ditched the unity generate lightmap uv's because the uv faces were still connected. So I went to blender and marked all edges as seams and did a uv unwrap. That left me with some ugly bleeding between all the faces but no more jagged edges. Then tried Lightmap Pack, same thing happened. Increased the margin. Same thing.
Deactivated the denoiser and everything got fixed. No more jagged edges and even the AO worked perfectly but I was left with some horrible noise.

This is where I am stuck right now. I don't have any uv overlap and a few texels between each uv chart.

 

) Sorry, sometimes I get really tired. Last night I had an revelation and decided to switch the art style from low poly to stylized so these problems might not happen again.

But I will explain in case anyone has these problem or I will face it again.
I didn't post any photos with the noise. The 3 pictures are from the same bake in which I used the denoiser. The second pic shows the highest bleeding and the first in the first one you can see a zoomed in picture of it's uv's.

In the third photo you can see what usually happens, on most 3D models, slight bleeding but noticeable.

I baked the whole scene with the denoiser off and you can see the pictures from the same angles as before so you can compare.

It's hard for me to tell if there is still some bleeding happen because of the huge amount of noise. I doesn't look like it on direct lighting.

Thank you.

 

I know this is an old topic, but I was struggling with this the last days. I messed around with a lot of settings, until I got to filtering. I was using Optix for Denoiser, and after changing to "None" the issue was solved, but AO got very noisy. So I found a middle ground using OpenImageDenoise and setting Gaussian to something around 2 texels for each one. I hope this helps someone out there.