Lecture "Physics in Game" in Game Development course at University of Management and Technology Lahore for Spring 2017 Semester by Hafiz Ammar Siddiqui

1. Physics in Game
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

2. Game Physics
• Game physics adds laws of physics into a game
• Close approximation ofreal physics which is implemented with discrete values
• Update the state of objects based on physicalcalculations
• Computemotion of objects in a scene
• Computemechanicalinteractions between objects in a scene
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

3. Kinematics and Kinetics
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

4. Kinematics
• Study of the motion of bodies without considering the mass and forces acting on them
(ignoring the forces that cause the motion)
• Focuses on position,speed, velocity and acceleration of bodies
• Speed: Rate of change of position with time (scalar)
• Velocity: Rate of change of position with time (vector)
• Acceleration: Rate of change of velocity with time (vector)
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

5. Kinetics
• Study of the motion of bodies with regard to the mass and forces acting on them
(consideringthe forces that cause the motion)
• Focuses on mass and forces acting on bodies
• Mass: Amountof matter contained in a body (scalar)
• Force: Thatchanges or tends to change the state of rest or motion of a body (vector)
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

6. Kinetics (Newton Laws)
• A body will remain at rest or continue to move in a straight line at a constant speed
unless acted upon by a force
• The acceleration of a body is proportional to the resultant force acting on the body and
is in the same direction as the resultantforce
• For every action, there is an equaland oppositereaction
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

7. Rigid Body and Soft Body
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

8. Rigid Body
• A system of particles that remain at fixed distances from one another
• Distance between any two points of a rigid body remains constant in time regardless of
externalforces exerted on it
• Rigid body translates or rotates as a whole, no relative translation or rotation among
the particles of a rigid body
• It does not change its shapeduring its motion or when it encounters anycollision
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

9. Soft Body
• A system of particles that can change their distances from one another
• Distance between any two points of a soft body changes with respect to the external
forces exerted on it
• There is relative translation or rotation among the particles of a soft body
• It can change its shapeduring its motion or when it encounters anycollision
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

10. Collision Detection and Collision Response
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

11. Collision Detection
• Process of determiningwhether two or morebodies haverun into each other or not
• Computational geometry problem involving the calculation of whether and where two
or more bodies havecollided or they are aboutto collide
• Discrete Collision: Determinewhether bodies are colliding at current time or not
• ContinuousCollision: Predict the exact point and time of collision between bodies
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

12. Collision Detection
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY
No collision at current time
Collision at current time
No collision at current time
Upcoming collision in future
Collision at current time
Discrete Collision Detection Continuous Collision Detection

13. Collision Response
• How bodies will react to collision
• Simulate what happens when a collision is detected between bodies
• Motion and shape of bodies after they havecollided with respect to their properties
• Rigid Body Collision: Bodies can change their position and rotation but not shapes
• Soft Body Collision: Bodies can change their position, rotation and shapes
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY

14. Reference
• Physics for Game Developers - David M Bourg, Bryan Bywalec
FROM: HAFIZ AMMAR SIDDIQUI – COURSE: GAME DEVELOPMENT – INSTITUTE: UNIVERSITY OF MANAGEMENT AND TECHNOLOGY