Why is cycles render grainy

Increasing the size of your light source definitely helps reduce fireflies and results in a cleaner image. However, by also applying MIS, you activate indirect light sampling, which helps Cycles calculate light rays that bounce indirectly to a light source. This results in the engine more accurately projecting light and further decreasing noise. From Blender 2. Materials with emission properties can also use Multiple Importance Sampling. Like light sources, they can take advantage of using both direct and indirect light sampling, having rays bounce directly and indirectly to the material, which makes for more accurate and cleaner results.

For objects with very bright emission materials, this can greatly reduce fireflies. For example, if an emission is not especially bright, it will take samples away from other brighter lights that may also be in the scene and lead to a noisier result.

Experimenting with MIS and how it affects the scene will help you better grasp the ways in which it can benefit your work. The MIS option can be found and activated in your Material Settings once your Material node tree includes an emission node. Learn more. Render is incredibly Grainy! Asked 5 years, 5 months ago. Active 5 years, 5 months ago. Viewed 50k times.

Improve this question. Community Bot 1. Jeff Teoh Jeff Teoh 1 1 gold badge 4 4 silver badges 11 11 bronze badges. New questions should be asked as a new post. Add a comment. Active Oldest Votes. Here's the scene at samples: Samples set on render layer override regular sample settings.

Improve this answer. Should i be going further? A faster way to help you is if you upload your file for inspection. Do you use large flat surfaces, where you can easily see inconsistencies. How many sample lightrays does cycles use is very very low, try but then is took many hours to complete.

And yes, de-noising with solve this problem a bit, but introduces other problems too less sharp. So in this case, perhaps because the second scene has smaller, dimmer lights, and maybe because of the extra effects from that standing lamp? The SUN is also a beam of light in one direction. So a ceiling lamp give too much light on the spot it self, so you make it less, but then the light on the floor from the ceiling lamp has low intensity, hence noise.

Also the world lighting has less influence in a building room, etc. But help in evenly distributing light everywhere. But for Cycles there are not many lightrays to calculate of importance.