Uncle Matt, a wild-haired maker wearing round welding goggles Uncle Matt makes
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PolyFish

A whole underwater ecosystem running in your browser. Everything in it eats, poops and reproduces, and the poop is where the plants come from.

2026 Three.jsWebXRVerlet physicsGLSL shaders
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A sunlit PolyFish reef full of low-poly fish and waving seaweed

Build log

  1. The PolyFish title screen, the word PolyFish in chunky gold 3D letters over a deep blue underwater scene with light rays falling to a rippled sandy floor.

    I rebuilt it for my dad's birthday

    My dad recorded the narration for PolyFish back in 2014, and then almost nobody got to hear it. For his birthday I rebuilt the whole thing to run from a link.

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  2. I wanted out of Unity

    Unity and Unreal have gone completely dominant and one-size-fits-all. The tools are nice. It's the business practices I wanted out from under, so rebuilding PolyFish was me checking whether I could leave.

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  3. Everybody poops

    The whole PolyFish food web runs on one humble mechanic. The first thing that happens in the sim, before a single fish, is a piece of poop falling out of the sky.

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