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enter image description here I am using 2 sun lamps, the principal one has the strength set to 30.000, the other one is pointing in the opposite direction, is bigger, and has the strength at 1200. An HDRI is supposed to light up the scene a little bit more, but even with all of this, I haven´t achieved a nice lighting, I am using filmic color management with the exposure at 2100 in order to see what it is in shadow areas (sofa), but I end up having a lot of noise, even with 2000 samples.

My glass is made by a glass and a transparent shader, mixed by an 0.855 factor. I don´t think the problem is the glass, becouse i made a test, deleting it just to see what the light would do without it, and the result was the same.

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    $\begingroup$ What are you using for the glass shader? $\endgroup$ – bertmoog Aug 16 '17 at 17:32
  • $\begingroup$ Add a very small amount of ambiant occlusion? $\endgroup$ – Stéphane Monté Aug 16 '17 at 17:59
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    $\begingroup$ 2 Sun lamps? One with strength at 30 000? Exposure in Color Management at 2100? There is something really crazy about these values. $\endgroup$ – Mr Zak Aug 16 '17 at 18:14
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    $\begingroup$ In this solar system we have only one sun... 2 of them doesn't seem right... Try using area lights, big soft sources that create very soft shadows, make those invisible to the camera (and maybe to the reflection, so they do not end up on the window). To control the shadow areas consider using the CDL node to shift the contrast of your scene (blender.stackexchange.com/questions/57919/…). How you set up the glass shader might have a huge impact on the scene, please edit your question and add more information on it. $\endgroup$ – cegaton Aug 16 '17 at 18:48
  • $\begingroup$ Are you using any clamping of either direct or indirect light? How many bounces? $\endgroup$ – bertmoog Aug 16 '17 at 19:42
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As I said, there are techniques at your disposal to reduce noise (and by extension, render time) that don't involve relinquishing your shadows. Here's an example showing how much Clamping actually affects shadow exposure. I've used the Denoising filter (for simplicity) included with Blender 2.79 Candidate but there are more effective and more flexible ways of controlling noise as well.

Denoising settings for this render:

enter image description here

Notice also the wood texture outside the window, with an Indirect Clamping value as extreme as 1.00, it's affected as well, since it's technically not Direct light.

enter image description here


Full size (Click to enlarge): enter image description here enter image description here

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