Function wallSystem

examples/scene-graph/interactive.ts:84–123

(dt: number)

// ============================================================

function wallSystem(dt: number): void {
  for (const id of dirtyWalls) {
    const wall = walls.get(id);
    if (!wall) continue;

    const [sx, sz] = wall.start;
    const [ex, ez] = wall.end;
    const t = wall.thickness;

    const dx = ex - sx;
    const dz = ez - sz;
    const len = Math.sqrt(dx * dx + dz * dz);
    if (len < 0.001) continue;

    const nx = -dz / len;
    const nz = dx / len;
    const hx = nx * t * 0.5;
    const hz = nz * t * 0.5;

    // Wall footprint polygon
    const polygon = [
      sx + hx, sz + hz,
      ex + hx, ez + hz,
      ex - hx, ez - hz,
      sx - hx, sz - hz,
    ];

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

    // Color based on selection
    if (wall.id === selectedWallId) {
      setSceneNodeColor(wall.handle, 0.3, 0.6, 1.0, 1.0);
    } else {
      setSceneNodeColor(wall.handle, 0.95, 0.95, 0.92, 1.0);
    }
    setSceneNodePbr(wall.handle, 0.8, 0.0);

    dirtyWalls.delete(id);
  }
}

// Light system (priority 5)
function lightSystem(dt: number): void {