Add a floor slab

A slab is a flat plate. You give its outline and its thickness. Use a slab for a floor plate, a terrace or a ceiling.

Before you start

You have a session from Start a building.

Write the slab

This slab goes below the room from Draw a wall. The path of a wall is its centre line, and those walls are 0.2 metres thick. Thus the slab outline is 0.1 metres outside the wall path, at the outer face of the walls. The slab is 0.2 metres thick. Its top is at the storey elevation, so its bottom is 0.2 metres below.

import type { BmSlab, BuildingSession } from '@opengeometry/floorkit';

export const groundFloor: BmSlab = {
  id: 'ground-floor',
  role: 'slab',
  profile: {
    outerRing: [
      [-0.1, -0.1],
      [6.1, -0.1],
      [6.1, 4.1],
      [-0.1, 4.1],
    ],
  },
  thickness: 0.2,
  baseOffset: -0.2,
};

Add it to the storey

A slab is an entry in the slabs list of its storey.

export function addFloorSlab(session: BuildingSession): void {
  session.apply(
    {
      kind: 'add-element',
      buildingId: 'building',
      storeyId: 'ground',
      list: 'slabs',
      element: groundFloor,
    },
    session.revision,
  );
}

The add-element command adds the slab to the list, and the session builds it. You keep the session and its undo history. The command rejects an id that the list has.

Rules

outerRing is a list of [x, z] points in metres. Do not repeat the first point.
A wall path is the centre line of the wall. To put the edge of a slab at the outer face of a wall, move the outline half of the wall thickness out from the path.
baseOffset is the distance from the storey elevation to the bottom of the slab.
role can be 'slab', 'floor' or 'ceiling'. The role names the element. It does not change the shape.
For a hole, such as a stair opening, add a ring to profile.holes.

Move the slab

A slab that is in the model has a move command:

export function moveSlab(session: BuildingSession): void {
  session.apply(
    {
      kind: 'transform-slab',
      buildingId: 'building',
      storeyId: 'ground',
      slabId: 'ground-floor',
      origin: [0, 0],
      translation: [1, 0],
      yawDeg: 0,
    },
    session.revision,
  );
}

Add a roof

Close the building at the top.

Slab API

See each option of a slab.

Documentation

Before you start

Write the slab

Add it to the storey

Rules

Move the slab

Next

Add a roof

Slab API

​Before you start

​Write the slab

​Add it to the storey

​Rules

​Move the slab

​Next

Add a roof

Slab API

Before you start

Write the slab

Add it to the storey

Rules

Move the slab

Next