reducing noise in interior scenes

[sparky]

Sorted.....cheers and thanks very much guys.....life-savers!!!!

looks like noisy area lights would be my guess. try raising their subdivisions. Also if your using a fairly high quality irradiance map, try storing the lights with the irradiance map, that will definitely get rid of noise, but you might start to see some splotches depending on other settings. I'd recommend some searching of the forum, as this is a common issue.

[_jaro]

percydaman:

Also if your using a fairly high quality irradiance map, try storing the lights with the irradiance map, that will definitely get rid of noise, but you might start to see some splotches depending on other settings

I have never used "store with irr map before".
What you are saying is that it is "good" to turn it on when using high settings of irr map?

[_jaro]

Vray manual:

The result is that the irradiance map is computed more slowly but the rendering takes less time. You can also save the irradiance map and reuse it later

So when this is usefull to use? From what this sentance says I think that total time of rendering is going to be same? I mean render of static scene. And having less noice in the image is another benefit of it?
Maybe it is very usefull with animation.
Please more explanation on it .

[BELCORP_SAC]

PUTING THE CHECK ON STORE IN IRRADIANCE MAP IN THE VRAY LIGHT YOU WILL DECRESE RENDER TIMES A LOT BUT YOU WILL LOOSE ALL THE NICES AREA SHADOWS THAT LIGHT WILL DO WITHOUT CHEKING IT.

[_jaro]

So it depends on scene?
When I have large open spaces interior or exterior, it is good to turn it on to save time when rendering and not taking care of details? It should be also usefull when doing test renders, I guess.

[BELCORP_SAC]

I think thats right. i use it that way or for animation were you dont need to much detail cause of the motion of the camera.I dont know if im totaly right , but for me it gos perfect

[rivoli]

just a quick example: same scene rendered with adaptive qmc aa, default irr map parameters, and no secondary bounces. only one light in scene, on the left store with irr map is on, on the right is off.
as you can see there are a couple of things to notice: since the shadows get sampled with the irr map, when store it's checked, depending on your parameters you can loose detail and smooth things out a bit too much (especially the area just below the handle of the teapot).
it renders faster when store it's on, almost twice as fast in this case.
last thing to notice, I unchecked trace reflections in the mat properties for the teapot, and as you can see, since speculars don't get stored in the irr map, you totally loose them.

I guess more expert users can explain things much better then I, but anyway, hope this helps a bit.

[_jaro]

percydaman:

that will definitely get rid of noise, but you might start to see some splotches depending on other settings

He is speaking about the same thing then.
Turning "Store with IRR map" ON will decrease the quality of render so it means no noise, but splotchenes may occur. How would you get rid of it?
Raising your globall sampling multiplier or particular lights sampling? But this will prelong rendering time ... so I would have same rendering time as with "Store with IRR map" OFF .... .... preaty much of alchemy

[percydaman]

first thing i try is raising hpsh subdivs and see if it removes splotches from the area lights.