[fabrizio_S]

I'm rendering an interior and after 4 hours (with a quadcore Q 6600) it has a lot of noise.
I have 9 spotlights, 2 neons and phisical sky.

It is normal?

bye

fabrizio

[Renato Lemus]

It depends in many things: Modelling habits, emitters polygon count, materials, size of the rendering, etc. but, 4 hours for a normal rendering seems not enough to me when using daylight and artificial lights mixed. It takes much more time to clean.

a screenshot would be useful.

[m-Que]

Do you have MultiLight enabled?

[fabrizio_S]

yes, I have multilight

[m-Que]

yes, I have multilight

Then multilight is your problem. There's no way an interior image would get noise-free with 12 layers of multilight within 4 hours.
If multilight is not what you're after (I mean you don't need ALL the light possibilities) try grouping the lights - for example 9 spotlights into 1 or two groups, 2 neons into 1, + physical sky. 3 layers of multilight, will speed up the render process notably
Note that using multilight slows rendering a lot.
Again, if you're after all the light possibilities, you'll have to wait a loooong time.

[Fernando Tella]

I don't think multilight slows anything. Using a lot of different lights does.
Physical sky for interior shots really produces a lot of noise (bounced light coming in through small openings and calculation of all the exterior bounces).

[JorisMX]

I do think multilight slows things down, just check the benchmark with and w/o...

IMO it uses alot of RAM and also increases MXI size which needs to be written for every update which again means mxcl will store a huge file every 5 minutes (huge,...of course depending on pixels)

The Multilight grouping Tipp is very helpfull, but kind of puts you into a small box with using same amount emitters in groups because you have to devide through t he number of emitters to 100% (make a search its been discussed recently).

I prefer using bareable resolutions to get the light right 1200x1200 and then make fine adjustments in like 2400x2400, and finally save a new file for the big rendering for print (in my case mostly around 5000x5000), adjust all emitters to the values of the Multilight value

A ML value of 100 = 100%. So if your wattage is lets say 65W, 150W and 200W and your emitters would be set to 50, 350 and 24 you just multiply the value of the watts to make your emitters match the multilight setting.

Like this:

65W*50%(0,5)= 32,5W,
150W*350%(3,5) = 525W
200W*24%(0,24) = 48W

[Bubbaloo]

I'm rendering an interior...physical sky.

There's your main problem. Sunlight through a small opening in a box will take a month to clear... Ok I'm exaggerating, but you get the point. If possible, simulate the sunlight with an emitter.

[fabrizio_S]

1-but how can I put light in a group?

2-Can noise increase from a light trough a glass? To simulate ies I create spotlights with an emitter and a glass lens (something like this
http://www.evermotion.org/index.php?unf ... =exclusive)

thanks in advanced

fabrizio

[m-Que]

1-but how can I put light in a group?

Select all the lights you want to merge.
Right Click - Merge Objects
This will merge the selected lights into one single emitter that will be controlled from multilight panel

2-Can noise increase from a light trough a glass? To simulate ies I create spotlights with an emitter and a glass lens (something like this
http://www.evermotion.org/index.php?unf ... =exclusive)

thanks in advanced

fabrizio

WOW Now I see the problem.
With that sort of settings you'll never get rid of noise - 'light-through-glass' is a very bad idea.
This thread should help you:
http://www.maxwellrender.com/forum/view ... 6&start=30

BTW: Are you using glass material for windows? That's another source of noise you'll never get rid of. If so, change glass for AGS material or remove it completely (I do remove windows material completely whenever I do the day shots, since you won't see the glass anyway.)

[fabrizio_S]

Hi m-Que,
I work in rhino...so do you know I to merge?

I don't use glass for windows....but is there a way to create a simply glass that make less noise changing some parameters (for example Abbe or trasparency)?

bye

fabrizio

[djflod]

Code: Select all

If possible, simulate the sunlight with an emitter.

what would be good settings for such an emitter Brian ?

[kami]

I work in rhino...so do you know I to merge?

In rhino you need to mesh your objects first.
I usually create the meshes with _mesh and the lowest(!) density settings. because the more polygons your emitter has, the slower it'll render.
then I move the meshed lights to a new layer and _join them. after that I hide the layer with the original non-mesh light objects and keep them, if I have to change something later.
you need to mesh your lights to have a better control over their polygons and to be able to join them.
also remember: if you join 5 lights with 100 watts the new light must have 500 watts to be equally bright.

btw: I never noticed the ML switch making the render much slower ... are there any studies on that?

[m-Que]

....but is there a way to create a simply glass that make less noise changing some parameters (for example Abbe or trasparency)?

AGS is a good solution. But it's nd=1.00, so it won't cast caustics.
You can check out MXMGallery, there were some nice materials like UltraFastGlass...

[fabrizio_S]

thanx to everybody