Physics 3D Introduction

Cocos Creator currently supports the lightweight collision detection system builtin and the physics engine cannon.js with physical simulation, and the asm.js/wasm version ammo.js of the powerful physics engine bullet, also we provides users with efficient and unified component-based workflow and convenient methods of use.

Physics World And Elements

Elements in the physics world can be divided into rigid body. We can adding physics elements by adding a collider (Collider) or rigid body (RigidBody) component to the game object. The physics system will perform calculations on these elements to make their behaviors the same with the real world.

Note: the rigid body here doesn't refer to the RigidBody component. The RigidBody component is used to control the properties related to the physical behavior of the rigid body.

Adding a Physical Element

Adding a physical element to the world can be divided int the following steps:

1. Create a new shape Cube;
2. Click Add Component on the Inspector panel witch is on the right of editor;
3. Select BoxCollider under the Physics menu, and adjust the parameters;
4. add a RigidBody component in order to make it have physical behavior.

In this way we get a physical element that has both a collider and a physical behavior.

Perfecting The Physics World

We can add a ground to the world. Following the steps 1,2,and 3, you can add another Plane with collider only.

Then, adjust the view of the camera (select the camera and press the shortcut Ctrl + Shift + F to align the camera view to screen).

Finally, click the run button, you can see the changes of physical elements in the scene. The final scene is shown in the following figure:

Composition Of Physical Elements

A physical element can be composed of the following ways:

• A RigidBody component
• One or more Collider components
• One RigidBody component plus one or more collider components

More Detailed Modules

Additional physics system will be introduced in more detail through the following modules:

Module	Description
Physics Options	Introduces the optional options of low-level physics engine in Cocos Creator
Physics System	Introduces the physics system and a series of properties and interfaces of the physics system.
Physics Component	Introduces some physics components and a series of properties on the panel.
Physics Usage	Further introduces the use of physics, events, group masks, etc.