# Spiral

> Runnel pack: a stone column wound with a railed wooden spiral ramp, like a helter-skelter, on a lathe-turned wooden base. A wooden ball comes up through the column into the cup on top, hops onto the ramp, runs round and round it down to the foot and rolls into the column again. A tap makes it hop. Raymarched in WebGL.

- Slug: `runnel-spiral`
- Category: [Asset packs](https://www.assembli.design/category/asset-packs.md)
- Subcategory: [Runnel](https://www.assembli.design/category/asset-packs/runnel.md) (`runnel`)
- Type: component
- Tags: 3d, webgl, raymarching, asset, wood, marble, brass, spiral, helter-skelter, ramp, ball
- npm dependencies: none
- shadcn/ui dependencies: none
- Added: 2026-10-24
- Live preview: https://www.assembli.design/preview/runnel-spiral
- Page: https://www.assembli.design/components/runnel-spiral

## Install

One-time setup (needs a subscription):

1. Add the registry to the project's `components.json`: `{"@assembli":{"url":"https://www.assembli.design/r/{name}.json","headers":{"Authorization":"Bearer ${ASSEMBLI_API_KEY}"}}}` (merge into `"registries"`).
2. Put an API key from https://www.assembli.design/account in `.env.local` as `ASSEMBLI_API_KEY=asm_…`.

Then install with the shadcn CLI (writes `components/runnel-spiral/runnel-spiral.tsx` and installs dependencies):

```bash
npx shadcn@latest add @assembli/runnel-spiral
```

Registry item JSON: https://www.assembli.design/r/runnel-spiral.json (send `Authorization: Bearer <api key>`)

## Code

> Component source needs an Assembli subscription ($12/month) and an API key sent as `Authorization: Bearer <key>`. To get one without copying anything, POST https://www.assembli.design/api/agent/login (or call the MCP tool connect_account), show the user the link it returns, and poll https://www.assembli.design/api/agent/token for the key. Or subscribe at https://www.assembli.design/pricing and create a key at https://www.assembli.design/account.