Physics Simulation Morten Paluteder What is physics simulation? - - PowerPoint PPT Presentation

Physics Simulation

Morten Paluteder

What is physics simulation?

• Imitate the laws of reality
• Computer animation, film, industrial design,

video games, science

The physics

• Mechanics
• Kinematics & kinetics
• Newton's laws of motion
• Forces, force fields, friction

Physics engine

• Middle man between hardware and software
• Real-time vs high-precision
• Scientific engines
• Game engines

Rigid body

• All the bodies that are not deformable
• Resistant body
• Translation, rotation

Rigid body collisions

• Different implementations
• Rigid body as a set of particles
• Detect particles collision
• When two particles collide, apply force

Soft body

• Deformable objects
• Maintain some kind of shape
• Multiple methods
• Simulate cloth
• Fracture, cutting, tearing
• Collisions – discrete, continuous

Crashes

PhysX

• Owned by Nvidia
• Free SDK on Windows
• Physic Processing Unit (PPU)
• Unreal Engine, Unity, Torque

• PhysX Flex

Havok

• Owned by Intel
• Over 500 titles
• Second life

PhysX vs Havok

• The big two
• Havok a bit more on consoles
• PhysX free on Windows

Bullet

• Free and open source
• Collision detection, rigid and soft body

dynamics

• 15 games (GTA4&5)
• 10 Hollywood movies
• Blender, Poser and other 3D tools

Bullet Physics in Blender

Ragdoll physics

• Series of animations
• Death sequences, falling
• Gameplay element

Bunnyhopping

• Originates from Quake Engine
• Unnaturally fast movement
• Air strafing
• Quake acceleration & friction
• Competitiveness

More

Adventure of a ball Flappy Bird Cabbage Frozen Snow

Links & References

David M. Bourg, Bryan Bywalec 2013: Physics for Game Developers, 2nd edition GPU Gems 3 https://flafla2.github.io/2015/02/14/bunnyhop.html