3d-object-annotation-basics.md

---
title: '3D Object annotation (basics)'
linkTitle: '3D Object annotation'
weight: 19
description: 'Overview of basic operations available when annotating 3D objects.'
---

### Navigation

To move in 3D space you can use several methods:
- Select the `move the image` tool so you can move the camera using the mouse:

  ![](/images/image149.jpg)

  - Hold down the left mouse button in the perspective window to turn the camera around the conditional point.
  - Hold down the right mouse button in the perspective window to move the camera inside the 3D space.
  - Move the mouse while holding down the wheel to zoom in/out in the perspective window.
  - Scroll the wheel to zoom in/out (works both in perspective and in projections).

- Move using the keys in the perspective window

  ![](/images/image216_carla_town3.jpg)

You can move around by pressing the corresponding buttons:
- To rotate the camera use: `Shift+arrrowup`/`Shift+arrrowdown`/`Shift+arrrowleft`/`Shift+arrrowright`.
- To move left/right use: `Allt+J`/`Alt+L`.
- To move up/down use: `Alt-U`/`Alt+O`.
- To zoom in/out use: `Alt+K`/`Alt+I`.

### Creating a cuboid

To create a cube in a 3D task you need to click the appropriate icon on the control sidebar,
select the label of the future object and click `shape`.

  ![](/images/image217.jpg)

After that the cursor will be followed by a cube. In the creation process you can rotate and move the camera
only using the keys. Left double-click will create an object.
You can place an object only near the dots of the point cloud.

  ![](/images/gif026_carla_town3.gif)

To adjust the size precisely, you need to edit the cuboid on the projections, for this change `Сursor` on control
sidebar or press `Esc`. In each projection you can:

Move the object in the projection plane - to do this, hover over the object,
press the left mouse button and move the object.

  ![](/images/gif027_carla_town3.gif)

Move one of the four points - you can change the size of the cuboid by dragging the points in the projection.

  ![](/images/gif028_carla_town3.gif)

Rotate the cuboid in the projection plane – to rotate the cuboid you should click on the appropriate point
and then drag it up/down or to the left/right.

  ![](/images/gif029_carla_town3.gif)