Done already for your convenience! Telerik School Academy Unity 2D Game Development

1. 2D Physics Overview 2. RigidBody 2D 3. Colliders 2D 1.Circle Collider 2D 2.Box Collider 2D 3.Polygon Collider 2D 4.Edge Collider 2D 4. Forces 2

Rigidbodies, Colliders, Joints, etc.

 All physics elements are normal components  Just add them to a game object  Set all needed properties  The physics engine will start using them  Enjoy the effects  Enjoy the effects 4

 Rigidbodies Rigidbodies  Main component for the Physics Engine to start  With Rigidbody the object will start to respond to gravity  If you enable Rigidbody, you should not try to change the Transform part of the object  Instead, you should apply forces and let the engine do the heavy lifting  If you need non-moving by the engine Rigidbody, check “Is Kinematic” option 5

 Colliders Colliders  Define the shape of an object in terms of physical collisions  Most of the time invisible  Use Box Collider and Circle Collider whenever possible for performance reasons  Otherwise use Polygon Collider  Colliders with Rididbody are dynamic colliders  Colliders without Rigidbody are the static environment in your game – walls, floor, etc. 6

 Physic Materials Physic Materials Physic Materials  Materials define the physics collision effect  For example – ice is slippery, rubber has friction  Usually parameters are found by trial-error  In 2D there are two parameters  Friction – friction coefficient  Bounciness – the degree to which collisions rebound from the surface  0 – no bounce effect  1 – full bounce effect with no loss of energy 7

 Joints Joints  Attaching two rigidbodies to a fixed point  Allow restricted movement  Rotation by the three axes  Translation by the three axes  Stretching like a spring  You can set joint to break if certain force is applied 8

 Different Types of Colliders  Trigger Collider – does not respond to physics calculations but sends event to which you can subscribe from the scripts  OnCollisionEnter2D / OnTriggerEnter2D – when two colliders starts colliding for the first time  OnCollisionStay2D / OnTriggerStay2D – when two colliders are colliding  OnCollisionExit2D / OnTriggerExit2D – when colliders are no longer colliding  Simply select “Is Trigger” 9

 Different Types of Colliders  Static Collider – object with collider but no Rigidbody  Used for level geometry and should never move  Should not be disabled or enabled  If you do, major performance decrease may occur  Also – calculation errors in the engine may occur  If you want to alter it – add Rigidbody to it 10

 Different Types of Colliders  Rigidbody Collider – object with collider and Rigidbody  Most common case  Fully simulated by the physics engine  Reacts to collisions  Reacts to forces from script  Collide with all other objects 11

 Different Types of Colliders  Kinematic Rigidbody Collider – object with collider and Kinematic Rigidbody  Has “Is Kinematic” property set  Does not react to collisions and forces from the engine  Should be moved by a script  They behave like static colliders but can be enabled/disabled/moved when needed 12

How to use it?

 Rigidbody 2D Rigidbody 2D Rigidbody 2D  Attach it to objects controlled by the physics  In 2D only the XY plane takes effect for translation and the Z axis for rotation 14

 Properties of RidigBody 2D  Mass – mass of the object  Linear Drag / Angular Drag – coefficient for movements  Gravity Scale – whether the gravity should be more or less on this object  Fixed Angle – can be rotated or not?  Is Kinematic – is the body moved by forces and collisions 15

How to use it?

 Box Collider 2D Box Collider 2D Box Collider 2D  Rectangular shaped collider  Attached to an game object  With or without a sprite 17

 Properties of Box Collider 2D  Material – the material to use for the collider  Is Trigger – whether events should be sent  Offset – local offset of the collider geometry  Size – the size of the rectangular shape 18

How to use it?

 Circle Collider 2D Circle Collider 2D Circle Collider 2D  Circular shaped collider  Attached to an game object  With or without a sprite 20

 Properties of Circle Collider 2D  Material – the material to use for the collider  Is Trigger – whether events should be sent  Offset – local offset of the collider geometry  Radius – the radius of the circular shape 21

How to use them?

 Polygon Collider 2D and Edge Collider 2D Polygon Collider 2DEdge Collider 2D Polygon Collider 2DEdge Collider 2D  Complex shaped collider  Attached to an game object  With or without a sprite  Difficult to compute – performance impact 23

 Properties of Polygon Collider 2D and Circle Collider 2D  Material – the material to use for the collider  Is Trigger – whether events should be sent  Offset – local offset of the collider geometry 24

How to use them?

 Two types of forces  Constant Force 2D Constant Force 2D Constant Force 2D  Effectors (Area Effector 2D for example) Area Effector 2DArea Effector 2D  They both are added to a Rigidbody 2D  Applied every Update of the game  Good for in-game mechanics  Have acceleration options 26

 Rigidbody – component used by the physics engine for calculations  Colliders – components to register any colliding objects in the game  Different types of colliders – static, kinematic, etc.  Other physics elements – joint, forces, etc. 27

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