Function wallSystem

examples/scene-graph/room.ts:162–211

(dt: number)

// WallSystem (priority 4) — generates wall geometry with door cutouts
function wallSystem(dt: number): void {
  for (const id of dirtyNodes) {
    const node = nodes.get(id);
    if (!node || node.type !== 'wall') continue;

    const handle = ensureSceneNode(id);
    const wall = node as WallNode;

    // Generate wall polygon
    const polygon = generateWallVertices(wall);
    if (polygon.length === 0) continue;

    // Extrude wall polygon
    extrudePolygon(handle, polygon, wall.height);

    // Apply door cutouts via CSG box subtraction
    for (const childId of wall.children) {
      const child = nodes.get(childId);
      if (!child || child.type !== 'door') continue;
      const door = child as DoorNode;

      // Compute door position along wall
      const [sx, sz] = wall.start;
      const [ex, ez] = wall.end;
      const dx = ex - sx;
      const dz = ez - sz;
      const len = Math.sqrt(dx * dx + dz * dz);
      const nx = -dz / len;
      const nz = dx / len;

      // Door center along wall
      const cx = sx + dx * door.position;
      const cz = sz + dz * door.position;

      // Cutout box (slightly wider than wall thickness for clean cut)
      const halfW = door.width * 0.5;
      const wt = wall.thickness * 1.5;
      subtractBox(handle,
        cx - halfW * (dx / len) - nx * wt, 0.0, cz - halfW * (dz / len) - nz * wt,
        cx + halfW * (dx / len) + nx * wt, door.height, cz + halfW * (dz / len) + nz * wt,
      );
    }

    // White wall material
    setSceneNodeColor(handle, 0.95, 0.95, 0.92, 1.0);
    setSceneNodePbr(handle, 0.8, 0.0);

    clearDirty(id);
  }
}

// LightSystem (priority 5) — sets up lighting each frame
function lightSystem(dt: number): void {