Bones

The engineering X-ray for Pascal.
See through the finishes to what actually gets built — framing, foundation, wiring, plumbing, ductwork — derived from your model, sized to your jurisdiction, rendered in 3D.

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What it does

Draw a house in Pascal. Click ⚡ X-Ray this level. Bones derives the construction inside it:

• Wall framing — studs at 16"/24" o.c., bottom/top/cap plates, and around every door and window: king studs, trimmers, headers auto-sized by span, sills, cripples.
• CMU walls — Florida-style exterior block: running-bond coursing, precast lintels, bond beams. Per-wall override: framed / CMU / skip.
• Floor framing — joists sized by span tables, rim joists, girders + posts when the tables run out, blocking.
• Roof framing — rafters, ridge, hips, ceiling joists, collar ties; hurricane ties in high-wind states.
• Foundation — frost-depth footings, stemwalls, anchor bolts at code spacing, seismic hold-downs where the SDC calls for them.
• Electrical — NEC 210.52 receptacle walks (doorways break the wall line), GFCI in wet rooms, switches at latch sides, lights, smoke alarms, the panel.
• Plumbing & HVAC — schematic DWV stack + drains + supplies to wet walls; equipment, trunk + branch ducts, registers, return, thermostat.
• Takeoff — counted from the actual generated members (never re-estimated): lumber by size and stock length, board feet, concrete yards, block counts, devices. Copy as CSV.

Everything is derived, live: move a wall and the skeleton re-frames instantly. Only a small per-level config node is saved with the project.

Jurisdictions

Building codes are adopted per state (researched dataset: all 50 + DC — adopted code editions, frost lines, snow/wind/seismic values, with sources in docs/research/). Pick your state — or let Auto suggest one from your browser's timezone (zero network calls) — and LOD Code-sized applies it: footing depths chase your frost line, anchor bolts tighten in seismic states, hurricane ties appear on the coast, Florida walls turn to block. Outside the US, the International (generic) profile applies conservative defaults.

Drafting aid, not engineering. Values are typical/approximate — always verify with your local building department.

Using it

Bones ships in the Pascal editor's Plugins sidebar (installed by default when the host bundles it). Open the Bones rail panel → X-Ray this level. Toggle systems, switch jurisdiction, select a wall to override its construction, copy the takeoff. Loose lumber at the bottom places individual members (2x4 … 6x6 at actual dressed sizes) for hand-framing and debugging.

Publisher

• Author: Julien Brissonneau — @Snoopy147
• Org: pascalorg · Support: issues · License: MIT
• Inspired by the excellent PlanCrafters by Steven Tibbs — "not pictures, plans."

Capabilities & data

• Node kinds: bones:framing (per-level X-ray config), bones:lumber (loose members). One editor panel ("Bones").
• No external origins, no network calls, no accounts, no personal data. The jurisdiction auto-suggestion reads the browser's timezone/locale locally.
• Persisted project data: only the plugin's own config/lumber nodes. All derived members live in memory.
• Lazy renderer/panel entry points; peer-deps on @pascal-app/*, React, Three.js.

Develop

bun install
bun run check-types
bun test            # engine geometry tests, NEC walks, table lookups

Architecture and geometry conventions: ARCHITECTURE.md. Roadmap and LOD ladder: SPEC.md. Domain research with sources: docs/research/.

Load in a host

import { extendPluginDiscovery } from '@pascal-app/core'
import { registerEditorHostPanel } from '@pascal-app/editor'

extendPluginDiscovery(async () => {
  const { bonesPlugin } = await import('@pascal-app/plugin-bones')
  return [bonesPlugin]
})
const { bonesHostPanel } = await import('@pascal-app/plugin-bones')
registerEditorHostPanel(bonesHostPanel)