Learn how to reduce noise and fireflies with caustics in Cycles
Cycles vs Eevee:
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.