threejs-worldgen
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    Function createFishMaterial

    • The fish material: swimming as vertex animation and the colour pattern, both in TSL, no textures.

      Geometry attribute fauna = (s, h, part, w) (see buildFishMesh). Per-instance attributes: faunaMotion = (tail-beat phase, amplitude scale, turning bend, fin phase) and faunaLook = (hue shift, brightness, pattern phase, random). Body wave: lateral offset A(s)·sin(k·s − phase) with A growing toward the tail, plus bend·s² while turning; paired fins flutter on their own phase.

      Parameters

      • u: {
            back: UniformNode<"color", Color>;
            belly: UniformNode<"color", Color>;
            eye: UniformNode<"vec3", Vector3>;
            eyeColor: UniformNode<"color", Color>;
            fin: UniformNode<"color", Color>;
            mouth: UniformNode<"vec3", Vector3>;
            shade: UniformNode<"vec2", Vector2>;
            spotColor: UniformNode<"color", Color>;
            spots: UniformNode<"vec4", Vector4>;
            states: UniformNode<"vec4", Vector4>;
            stripeColor: UniformNode<"color", Color>;
            stripeRegion: UniformNode<"vec3", Vector3>;
            stripes: UniformNode<"vec4", Vector4>;
            surface: UniformNode<"vec3", Vector3>;
            swim: UniformNode<"vec3", Vector3>;
        }
        • back: UniformNode<"color", Color>

          Back colour.

        • belly: UniformNode<"color", Color>

          Belly colour.

        • eye: UniformNode<"vec3", Vector3>

          x = eye z, y = eye y, z = radius (mesh units).

        • eyeColor: UniformNode<"color", Color>

          Iris colour.

        • fin: UniformNode<"color", Color>

          Fin colour.

        • mouth: UniformNode<"vec3", Vector3>

          x = mouth line y, y = mouth length (in s), z = body depth.

        • shade: UniformNode<"vec2", Vector2>

          x = countershade, y = shade line.

        • spotColor: UniformNode<"color", Color>

          Spot colour.

        • spots: UniformNode<"vec4", Vector4>

          x = density, y = size, z = region min, w = region max.

        • states: UniformNode<"vec4", Vector4>

          x = wetness, y = snow, z = burn, w = damage.

        • stripeColor: UniformNode<"color", Color>

          Stripe colour.

        • stripeRegion: UniformNode<"vec3", Vector3>

          x = region min, y = region max, z = edge darkness.

        • stripes: UniformNode<"vec4", Vector4>

          x = count, y = width, z = direction, w = wobble.

        • surface: UniformNode<"vec3", Vector3>

          x = iridescence, y = metalness, z = roughness.

        • swim: UniformNode<"vec3", Vector3>

          x = amplitude, y = wave number (rad per body length), z = fin flutter.

      Returns MeshPhysicalNodeMaterial

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