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pnn32 β [Octane] Improving Lighting with HDRI Environment
#hdri #tips #tutorial #octanerender
Published: 2015-05-08 21:15:03 +0000 UTC; Views: 2861; Favourites: 19; Downloads: 55
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Description
A simple technique for improving particular areas lighting while using HDRI environment in Octane Render (can also be applied for other unbiased render engines)--
Making of Taking photo of kitty climbing tree
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HDRI from HDRI-Hub
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Comments: 13
Same technique works well in Vue as well in all types of renders 
In addition to using reflective geometrical shapes in Vue, one can also use flat panel lights and choose which objects in the scene are affected by it.
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It sounds that it works totally like photo flash 
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Yes, I have problems with noise or hot pixels some times too
Such as:
- when using lamp props or other mesh lights
- when there is a lot of glossy/shiny materials
- in Daylight mode when light travels through window glass
It's annoying because I like my renders to finish in the 1000-6000 s/p range, but sometimes I have to let it go to 10 000 - 18 000 to get acceptable noise or hot pixel levels.
I once let an image run to 22 000 s/p and it looked like it might become okay at 40 000 - 50 000 at the rate it was going, but I have never let it run for that long so I don't really know.
Do you have any experience of using extreme high samples/pixel?
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It seems that the quality of image improves with increasing spp like 'inverse exponent' - i.e. increasing samples count make sense mostly in the beginning and has a very little effect at 10k spp and higher.
My peak spp values were 32k spp (fav.me/d8onpct ) and 30k (fav.me/d8r9g34 ). (Important notice: use only PMC kernel for such scenes; in case of PT kernel noise will not go away). As you can see, here is still much noise
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Yes, that has been my conclusion as well
Ah, that is a typical source of problems. Light prop (bulb) with a shade. I sometimes do the same as I do in Poser or Vue in similar situations, I find a way to get a tiny amount of "fill light" into the scene. It is many times needed when the main "object" of the image is between the light source and the camera.
I haven't even tried one like the pool image with Octane.Β
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Aren't the photographers using the same trick?
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Of course 
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Well, the reflector is pure white here, but its color can be also adjusted (mostly made more dark) if needed. In some cases it even should be done - for example inΒ fav.me/d8osrui the book pages color set to gray to avoid her face over-lighten.
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Wow, Nice...
Thank you for this information!
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