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vblackrender., thanks for scene!
there are 2 problems with interior: 1) Post-process exposure 6.7 - it's too hard for rendering sample to operate on almost black lighting and then compensate it in post. Numerical imprecision and other things have more influence at this scale. It's better to operate on exposure at values close to 0 or 1, 2. Don't forget to make Expected Exposure in render settings to be similar to the one in Post. What I did is to decrease Post Exposure, Increase HDR multiplier and increase the Clamp Direct/Indect values to 20. It's less noisy, but also has different contrast. So need to improve precision in future. 2) Some problems with sampling of your HDR. I don't know yet, but maybe the sampable resolution that we consruct is too low, need to see and not make +1 user setting. Actually I have tested another HDR (from the FB post scene). And it has much less noise. However, it's also bright, contrast (narrow sun), but it's lowres. Lowres/highres of original HDR shouldn't be influential, but the resolution of sampable HDR is. Dark corners in 2 fixed versions have less noise as I was looking for. So I am calm for that CentiLeo special GI sampling algo. Just need to improve HDR initial procession  |
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Btw, it lags on my PC too! Very slightly. The cooling system works too intensively and with the same rythm.
At the same time I like Flakes a lot more. They can be used as masks for multi-material stacking and combine several reflection shaders. Such manipulations are much easier in Node Editor of course. |
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Great to see this tests, very interesting!
Yes, I have tested the HDR in lower res, there where no difference.
I am excited to see the improvements
Good to know, that this doesnt happens just on my side!
Yeah, I need to test these out. |
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Research has shown that HDR resoultion issues were not issues in that case. But! There are 4 drawn light sources in your HDR. You may see them if move the camera outside the window.
1 of lights reaches the room through the window. Another one partially reaches the room. But 2 light sources of HDR image don't reach the room at all because they are blocked by top wall. But they are bright and grab the samples computations + add 2x more noise because return no any result. So that's why so noisy. Octane is even more noisy in this scene (a lot). I see 2 ways to fix this: 1) to erase not-needed lights from HDR image by user. 2) wait for some my adaptivity fix which may help and will cost probably +100Kb of memory consuption + tests/debugging or something like that
However HDR resolution issue appear in another case with very narrow bright light making very hard shadow. It's almost fixed. That problem gave 100x more noise than normal situation. |
Thats a good Idea!
+100kb is nothing
Thank you for this information! Its exactly like you said. I should import a HDRI with one main light source the next time. Never thought that, HDRI's can produce this kind of issueses, but makes totally sence. |
But we will see, maybe some separate Sky HDR materials types could be done (a few per scene) and some normal surface materials can link to them.
At the moment 6 Sky HDR objects are possible. You may create them and assign different .hdr/.exr files and make on/off for Camera, Diffuse, Reflection, SSS, Shadow Catcher, Transmission, Translucent. For example som Sky object Environment tag has only Camera channel = 1, others are zero. The second Sky object has only Diffuse = 1 and others zero. And this way you may assign different lighting to diffrernt channels. |
I do this very often. Nice technique! |
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Hi vblackrender., I have improved the noise reductions for HDR such as this one! 2x less noise in the same time!
 No iteration time increase. Other HDRs that were already good dont' become worse with this modification.
May I post the "before/after" image with this your scene on the news page related to the next 0.593 fix-release? Will also insert the link to your Behance |