1. Done already for your convenience!
2D Physics Engine
Done already for your convenience!
Unity 2D Game Development
Telerik Academy Plus

2. Three Seminars Part 1 Part 2 Part 3*
Three Seminars
Part 1
Intro to Unity 3D and 2D Game Development
Basic Math for 2D Game Development
2D Graphics and Animations
Part 2
2D Physics Engine
Game Scripting with C#
UI and Audio
Part 3
Building a 2D Game
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

3. Table of Contents 2D Physics Overview RigidBody 2D Colliders 2D Forces*
Table of Contents
2D Physics Overview
RigidBody 2D
Colliders 2D
Circle Collider 2D
Box Collider 2D
Polygon Collider 2D
Edge Collider 2D
Forces
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

4. Rigidbodies, Colliders, Joints, etc.*
2D Physics Overview
Rigidbodies, Colliders, Joints, etc.
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

5. 2D Physics Overview All physics elements are normal components*
2D Physics Overview
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 
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

6. 2D Physics Overview Rigidbodies*
2D Physics Overview
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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

7. 2D Physics Overview Colliders*
2D Physics Overview
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.
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

8. 2D Physics Overview Physic Materials*
2D Physics Overview
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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

9. 2D Physics Overview Joints Attaching two rigidbodies to a fixed point*
2D Physics Overview
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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

10. 2D Physics Overview Different Types of Colliders*
2D Physics Overview
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”
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

11. 2D Physics Overview Different Types of Colliders*
2D Physics Overview
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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

12. 2D Physics Overview Different Types of Colliders*
2D Physics Overview
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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

13. 2D Physics Overview Different Types of Colliders*
2D Physics Overview
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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

14. RigidBody 2D How to use it? *
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

15. RigidBody 2D 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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

16. RigidBody 2D Properties of RidigBody 2D Mass – mass of the object*
RigidBody 2D
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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

17. Box Collider 2D How to use it? *
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

18. Box Collider 2D Box Collider 2D Rectangular shaped collider*
Box Collider 2D
Box Collider 2D
Rectangular shaped collider
Attached to an game object
With or without a sprite
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

19. Box Collider 2D Properties of Box Collider 2D*
Box Collider 2D
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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

20. Circle Collider 2D How to use it? *
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

21. Circle Collider 2D Circle Collider 2D Circular shaped collider*
Circle Collider 2D
Circle Collider 2D
Circular shaped collider
Attached to an game object
With or without a sprite
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

22. Circle Collider 2D Properties of Circle Collider 2D*
Circle Collider 2D
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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

23. Polygon and Edge Colliders 2D*
Polygon and Edge Colliders 2D
How to use them?
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

24. Polygon and Edge Colliders 2D*
Polygon and Edge Colliders 2D
Polygon Collider 2D and Edge Collider 2D
Complex shaped collider
Attached to an game object
With or without a sprite
Difficult to compute – performance impact
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

25. *
Circle Collider 2D
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
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

26. *
Forces
How to use them?
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

27. Forces Two types of forces They both are added to a Rigidbody 2D*
Forces
Two types of forces
Constant Force 2D
Effectors (Area Effector 2D for example)
They both are added to a Rigidbody 2D
Applied every Update of the game
Good for in-game mechanics
Have acceleration options
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

28. *
Summary
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.
(c) 2007 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

29. 2D Physics Engine

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