Hi Radiance.
I did few tests with specular material as windowpane.
The generation of pixels behind a glass in interior is slowing down with time and the noise is not improving with time. Everything is rendered smoothly, except interior behind a glass. After 3 hours of redndering, the noise is still significant (two windowpanes 3,5h and 1 windowpane is faster bat not without noise). Do you have some tips, how to improve rendering scenes with glass windows?
The generation of pixels behind a glass
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That's because there's no MLT in Octane currently
You are basically lighting the inside with caustics
That's why its so slow
Wait for MLT and light portals and all will be OK both outside and inside
You are basically lighting the inside with caustics
That's why its so slow
Wait for MLT and light portals and all will be OK both outside and inside
http://Kuto.ch - Samuel Zeller - Freelance 3D Generalist and Graphic designer from Switzerland
Hi,
This is all related to the same issue.
I'll describe it here once, and if people notice other posts about the same question, please link to this post.
Rendering interiors with glass windows, or exteriors with views inside buildings with glass windows is very slow/noisy.
This is because you are lighting your inside of the house with a caustic.
The light is refracted 2x through the double sided glass windows,
and this is very innefficient.
Unbiased render engines have several techniques to make this more efficient, each one adds a lot to the efficiency,
and having them all together gives very fast render times/efficiency.
Since octane is still quite young, and it's not easy to develop these techniques quickly on a GPU platform,
we don't have much of them yet, so you will just have to let them render a little longer for now.
In any way, octane's raw speed makes the render time equal to a well mature unbiased renderer with these techniques,
eg try rendering an interior with a CPU unbiased renderer with architectural glass, portals and MLT and you will also have to wait 3-4 hours.
Here's a few techniques and approximately when they will be made available in octane:
- MLT - beta3
- portals - probably beta3 aswell, otherwise beta4
- architectural glass - i will try to squeeze it into beta2, if time permits, otherwise beta3.
Thanks,
Radiance
This is all related to the same issue.
I'll describe it here once, and if people notice other posts about the same question, please link to this post.
Rendering interiors with glass windows, or exteriors with views inside buildings with glass windows is very slow/noisy.
This is because you are lighting your inside of the house with a caustic.
The light is refracted 2x through the double sided glass windows,
and this is very innefficient.
Unbiased render engines have several techniques to make this more efficient, each one adds a lot to the efficiency,
and having them all together gives very fast render times/efficiency.
Since octane is still quite young, and it's not easy to develop these techniques quickly on a GPU platform,
we don't have much of them yet, so you will just have to let them render a little longer for now.
In any way, octane's raw speed makes the render time equal to a well mature unbiased renderer with these techniques,
eg try rendering an interior with a CPU unbiased renderer with architectural glass, portals and MLT and you will also have to wait 3-4 hours.
Here's a few techniques and approximately when they will be made available in octane:
- MLT - beta3
- portals - probably beta3 aswell, otherwise beta4
- architectural glass - i will try to squeeze it into beta2, if time permits, otherwise beta3.
Thanks,
Radiance
Win 7 x64 & ubuntu | 2x GTX480 | Quad 2.66GHz | 8GB