Creature · Rolls with distance

Snake

A European snake about 95 cm long lying on the ground, head toward +Z: a smooth round body that tapers to a thin tail, a slightly wider head with eyes and a glint, a hinged lower jaw and a forked tongue that flicks out. Grass snake: olive with a yellow and black collar behind the head, black bars along the flanks and a chequered pale belly; adder: grey-brown with a dark zigzag down the back, a dark V on the head and a stripe through the eye. The body is a chain of twelve nested segments (seg_0 behind the head to seg_11 at the tail tip) with head, jaw and tongue. It travels on the ground by distance: side-to-side waves run from head to tail with every joint following the path of the one ahead (Loop clip, loop_m metres per wave). Named clips: Slither (the same wave in seconds), Dangle (hanging limp from talons gripping it at seg_2 and seg_3, about a third of the way back: the body drops straight down from the pivot of seg_3 and sways like a pendulum, the tail curls, the head lifts and the tongue flicks) and Strike (rears into an S, lunges with the mouth open, settles back).

Size: 0.17 × 0.03 × 0.84 m
Triangles: 3,588
Kit: Wildlife

Open in the lab

FreeFree download, no account needed.

Also as , a .zip with the .obj and its .mtl.

Loop clip inside. The download carries the knobs you set here.

The other 13 in WildlifePro

Pro is $12 a month: all 590 specimens, every knob baked into GLB or OBJ. Or $79 once. See Pro plans

Tune it

3 knobs: Species, Colour, Size.

Specs

Size: 0.17 × 0.03 × 0.84 m
Triangles: 3,588
Draw calls: 1
Loop clip: 0.577 m
Moving parts: 15
Knobs: 3
Night lights: 0

Passed the validator: real scale, rests on y = 0, front faces +Z, deterministic.

Use it

Code for the specimen as it is set up above; it follows your knobs.

JavaScript

import { createAsset } from 'https://gaitkit.com/cdn/snake.mjs';

const snake = createAsset();
scene.add(snake);                      // rests on y = 0, front faces +Z

let dist = 0;
renderer.setAnimationLoop(() => {
  dist += speed * clock.getDelta();
  snake.position.z = dist;
  snake.userData.tick(dist);            // wheels roll exactly with the distance
  renderer.render(scene, camera);
});

JSX

import { useGLTF, useAnimations } from '@react-three/drei';
import { useEffect } from 'react';

// snake.glb from the Download button (it carries the knobs you set), saved in /public
export function Snake({ speed = 1 }) {
  const { scene, animations } = useGLTF('/snake.glb');
  const { actions } = useAnimations(animations, scene);
  useEffect(() => {
    const clip = actions['Loop'];
    clip?.play();
    if (clip) clip.timeScale = speed / 0.577;   // one Loop = 0.577 m of travel
  }, [actions, speed]);
  return <primitive object={scene} />;
}
// Live knobs or terrain-following feet: copy snake.mjs and runtime/ into your project and use the three.js tab.

GDScript

# Import snake.glb (download below). It carries an in-place "Loop" animation.
@onready var anim: AnimationPlayer = $Snake/AnimationPlayer

func _physics_process(delta):
    velocity = transform.basis.z * speed
    move_and_slide()
    anim.play("Loop")
    anim.speed_scale = speed / 0.577   # one Loop = 0.577 m of travel

// Import snake.glb with glTFast (com.unity.cloud.gltfast).
animator.Play("Loop");
animator.speed = speed / 0.577   // one Loop = 0.577 m of travel

Prompt

Use the gaitkit MCP server: get_variant({ "id": "snake", "want": "default look" })
then place the result and drive it with userData.tick(distance).

# MCP endpoint
https://gaitkit.com/mcp

More in the docs; agents can fetch all of this through MCP.

Knobs

Knob	Type	Values	Default	What it does
`species`	choice	`grass` `adder`	`grass`	grass = grass snake (Natrix): slender, olive with a yellow and black collar behind the head, black flank bars, round pupils. adder = European adder (Vipera berus): stouter, a broad flat head, a dark zigzag down the back, a dark V on the head and red eyes with slit pupils.
`colour`	choice	`natural` `pale` `dark`	`natural`	natural = the usual colours (olive grass snake, brown adder). pale = a grey-green grass snake or a silver-grey male adder with a black zigzag. dark = a dark olive grass snake or an almost black (melanistic) adder.
`size`	range	0.6 to 1.25, step 0.05	`1`	Uniform scale. 1 is a 95 cm grass snake or a 90 cm adder; 0.6 is a young one about 55 cm long; 1.25 is a big female of 1.2 m.

Presets: grass snake {"species":"grass"} · adder {"species":"adder"} · silver adder {"species":"adder","colour":"pale"} · young grass snake {"species":"grass","size":0.6}

Files

File	What
snake.glb	GLB, default look · 539 KB
snake.mjs	ES module, every knob live
snake.obj	OBJ, static; colours in the .mtl
snake.mtl	OBJ colours; keep it next to the .obj
snake-params.json	knob schema, presets, night zones

Licence

Use it in games, apps, renders and client work, commercially and without credit. Do not resell it as an asset or train a 3D generator on it. The full licence.