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As mentioned in the title of this post I am just struggling with the noise in my render result. I am not talking about fireflies, I am talking about actual noise.

I read a lot about how to improve the result by increasing the amount of samples and stuff, but for the following result I already sampled the image 2500 times.

enter image description here

As you can see, the scene is quite simple. I modelled a room with multiple spotlights in the ceiling.

enter image description here

In full resolution I have a lot of noise in the darker areas, even after 2500 samples.

The target of the project is to make 3-5 sec camera animations, that lead from one hot spot in one room to another (the showroom isn't finished yet btw).

This image took me about 12 minutes to render on renderstreet. And regarding the finished project, it would take me about 74 hours to render only one animation with this noisy result.

So my question is, how can I get a cleaner result with less samples, so it will render faster?

I added my .blend file for you to download. I deleted the glass stuff in the middle of the room because I want my client to be anonymous).

http://www.file-upload.net/download-9405390/main.blend.html

Thanks in advance! -Marten

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I guess, that you know most of the common tricks. But here are some tricks that I often use:

  • Make a hole into the building outside of the cameras view of field
  • Increase the resolution, decrease the sample rate and resize the image afterwards. This will make the image softer, but if you double the image size, and render with a low sample rate and resize the image afterwards, the noise is evened out (I was able to render an interior architectural scene with only 5 samples)
  • Enable a small amount of global illumination and increase the shadows afterwards with the Compositor
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  • $\begingroup$ Increasing the resolution works fine for noise problems, but also has some downsides: the render will take much more memory and might be slower in total. A picture at 200% render size may take 1/4th of the samples, but more than 4x the time to render. $\endgroup$ – piegames Sep 13 '16 at 15:16
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Did you bake your lighting? If the only thing that is moving is camera and not the lighting or the objects, you can bake all of that data to textures, apply them to each object and you can practically render and view your scene in realtime.

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    $\begingroup$ Welcome to the site :) Here we like detailed answers which explain how to do things in addition to general tips. If you don't wish to spend time on a slightly more in-depth answer right now, you might consider putting general pointers in the comment section (once you have enough reputation) $\endgroup$ – gandalf3 Jul 1 '15 at 5:26

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