Reducing Caustic Noise in Blender Cycles

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Learn how to reduce noise and fireflies with caustics in Cycles

http://cgcookie.com/blender/2013/01/14/reducing-caustic-noise-blender-cycles/

In this quick tip learn how to use the Light Paths node in Blender’s Cycles render engine to drastically reduce noise and fireflies when rendering with caustics. Normally caustics cause a lot of noise, and thus require a high number of samples to get a clean image. Because of this we commonly disable caustics to speed up the render times and get cleaner images. However, caustics also contribute a lot to the realism of a render as they are responsible for color bleed from bounce lighting.

By using Blender’s Light Path node to mix a glossy and diffuse shader we can drastically reduce the noise, keep caustics enabled, and produce a nicer image.

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