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Hi to all!

Recently I have updated my version of Maxwell from 1.7 to 2.7 and adquired an new, flamant Azken workstation with 2 Opteron 8 Core 4280 2.8 Ghz core, 32 Gb RAM, SSD drive, etc.

I have made all this changes because i've got a new, big job with severals interior scenes, rendered at 300 ppp A4 size.

Making some test i have encountered two big problems:

The first is i haven't got a clean, noise free render. Even in a simple scene with a few of polygons, and at SL16 the noise is still here! I have checked the scale of my scene, my RGB colors in materials never grater of 242, and many others little things i know can produce noise, without results. I put you some screen captures with my parameters, and renders. Illuminated only with sun & sky.

Max Scene & Camera settings



Maxwell Render settings



Maxwell Render settings & process



Render




The second problem is the render time. For a similar scene but with emmitters, sun & sky illumination, rendered at 3500x3000 px. it needs 24 h. to get a clean image!

This is not the first time i render interior scenes. In the past i have made scene with toons (millions maybe) of polygons, and rendered with maxwell 1.7 on my 6 years old workstation and got a clean image at 36 hours.

What i'm doing wrong? I have missed something? how I can solve it?

Thank you so much in advance and sorry for my poor english.

Miguel Cid.

What kind of material is the glass?

The glass material:

You are illuminating your scene with mostly caustics from the sun through the glass. Remove the glass or use AGS and give it another shot.

Hi Bubbaloo,

I have no glass in the windows, only the bath screen is glass in all the scene.

Does your scene benfit from using sun + physical sky? I don't think so. You should think like a photographer. Illuminate your scene with some emitters, don't relay on sun and sky for this one.

For the glass of the shower I would use two geometries: One with real glass but hidden to GI and a copy of it at the same place (slightly moved on every axis or it would give weird results) with AGS material applyed to it and hidden to camera and reflections/refractions. It's fast to render plus has refraction effect and a perfect glass look.

Images aren't working, at least for me.

Does your scene benfit from using sun + physical sky? I don't think so. You should think like a photographer. Illuminate your scene with some emitters, don't relay on sun and sky for this one.

For the glass of the shower I would use two geometries: One with real glass but hidden to GI and a copy of it at the same place (slightly moved on every axis or it would give weird results) with AGS material applyed to it and hidden to camera and reflections/refractions. It's fast to render plus has refraction effect and a perfect glass look.

Hi Fernando,
I have made test replacing the windows holes with emitters (like Vray portals), but getting the same or worse results. In others scenes of the same project, I have mix natural and artificial illumination with better results, but need make someones with natural light only.

Good trick for the glass of the shower, I'll test it, but in this case is not the problem. I've make some images without glass getting the same noisy render.

Dmeyer,
I put the files in Dropbox. MP and i'll send you a copy.

Thank you.

As Fernando said, think like a photographer. In most interior photography many additional lights and flashes are used to illuminate the scene, maxwell relies on light bouncing off a surface to determine the colour and reduce noise, glass can also slow down the light as it passes, In some cases you should avoid the use of it unless it is completely visible in the scene. Youtube Interior photography to get some tips, Of course you can apply any of those techniques to this.
Using a sky portal style thing is not the best option as the falloff may not disperse accurately, use real world techniques and maxwell will reward you.
Second is neat image, really good software.. I was shocked at how well it works, you want to avoid things looking plastic but it is very possible to use a second layer to 'mask off' flat areas and gradients of your render with a layer that has had the neat image treatment...

Hi,

Did you check duplicates, maybe it helpes.

krsz