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It seams that extra sampling may have problems when only rendering extra samples for objects that receive light through glass. Is this a limitation?


In this image you can see the wrong texture in the parking stalls. But notice there is not much noise. Rendered to 17sl.


Here is the image with the texture unwrapped properly and was rendered with extra sampling to 17sl but notice the noise difference. It is the same material that is used on the adjacent sidewalk. Which is less noisy too.


I have also noticed that when rendering extra samples for glass, like the storefront glass, you get strange artifacts as well. I will try and post something showing that as well.

But which objects did you assign extra sampling to? The windows or the ground?

In these images, it is the concrete strip in the parking stalls. See the first image how the texture uvs are messed up in that area. I fixed the uvs and did extra sampling only on that part.

are you tried to choose glass for extra sampling ?