The effect was made by 3D Artist Marco Pavanello.
3D Artist Marco Pavanello continues the series of cool projects made in Blender. This time, the artist has managed to set up realistic-looking caustics, using the power of Geometry Nodes to fake the effect. According to the artist, the effect was made in Blender Eevee and is based on the Fake Caustics with Geometry Nodes tutorial by MysteryPancake. If you want to create your own caustics effect, here's the aforementioned tutorial:
And here are some of Marco's previous projects:
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