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iOS Game Development By Example

You're reading from   iOS Game Development By Example Learn how to develop an ace game for your iOS device, using Sprite Kit

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Product type Paperback
Published in Aug 2015
Publisher Packt
ISBN-13 9781785284694
Length 220 pages
Edition 1st Edition
Languages
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Author (1):
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Samanyu Chopra Samanyu Chopra
Author Profile Icon Samanyu Chopra
Samanyu Chopra
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Table of Contents (12) Chapters Close

Preface 1. An Introduction to Sprite Kit 2. Scenes in Sprite Kit FREE CHAPTER 3. Sprites 4. Nodes in Sprite Kit 5. Physics in Sprite Kit 6. Animating Sprites, Controls, and SceneKit 7. Particle Effects and Shaders 8. Handling Multiple Scenes and Levels 9. Performance Enhancement and Extras 10. Revisiting Our Game and More on iOS 9 Index

SKPhysicsBody

A node's physicsBody property uses the SKPhysicsBody class object. In the life cycle of a frame, the didSimulatePhysics function is called just after actions are evaluated. The work of this function is to calculate the physical properties, such as gravity, velocity, friction, restitution, collision, or other forces. After these calculations are done, the positions and orientations of nodes are updated in the update function. If we are going to apply some force on a node, it is necessary that we assign the SKPhysicsBody object to that node first.

Sprite Kit provides us with two kinds of physics bodies:

  • Volume-based: These are the kind of physics bodies that have mass and volume
  • Edge-based: These are the kind of physics bodies that don't have mass and volume

In volume-based bodies, we can control if it should be affected by gravity, friction, collision, and so on, by setting it as static or dynamic. This property is very useful as we can make a static platform or a moving...

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