Physics
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Physics. Michael Vernier Robert Weekley Michael Ford. Why Physics?. More interactivity Looks cool (explosions) More realistic More variety and easier animations (rag doll physics for death animations) Better gameplay (space fighter, driving games). Why a Physics Engine?.

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Physics l.jpg

Physics

Michael Vernier

Robert Weekley

Michael Ford


Why physics l.jpg
Why Physics?

  • More interactivity

  • Looks cool (explosions)

  • More realistic

  • More variety and easier animations (rag doll physics for death animations)

  • Better gameplay (space fighter, driving games)


Why a physics engine l.jpg
Why a Physics Engine?

  • Physics simulation is hard

  • Requires very stable integrator

  • Articulated bodies especially take difficult math

  • Optimization is important

  • Spring systems explode easily


Major features l.jpg
Major Features

  • Collision detection

  • Newtonian forces and collision response

  • Buoyant forces

  • Friction

  • Articulation and jointed characters (rag doll)

  • Prebuilt objects for simulation


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Physics Toolkits

  • ODE (Open Dynamics Engine)

  • Ageia PhysX

  • Newton Game Dynamics

  • Havok

  • Havok FX

  • Tokamak Game Physics


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Newton Game Dynamics

  • Free for use with credit to authors.

  • Cross Platform (Win32, Mac OS X, Linux)


Features l.jpg
Features

  • Collision Detection

  • Collision Response

  • Buoyancy

  • Friction

  • Seven different Joints

  • Rag Doll Physics

  • Height Map Collision

  • Claims very stable solver


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API

  • C++ API

  • Tutorials

  • Wiki

  • API Documentation seems complete


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Used In

  • Not very much yet.

  • Several small independent games.

    • Future Pinball

    • Trembling Towers

    • Classic Cars Racer

    • Virtual Reality Chat

    • Ultra Stein 3D Pinball


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Ageia PhysX

  • Features

    • Designed for massively parallel hardware

    • Designed with games in mind

      • Complex rigid body system

      • Volumetric fluid and cloth simulations

      • Advanced Character Control

      • Ray-cast vehicles

    • Support for many scenes


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Ageia PhysX

  • Features (cont’d)

    • Remote debugging capability

    • Cross-Platform

      • Single and multi-core PC

      • Xbox 360

      • Playstation 3

      • PhysX Processor!


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Ageia PhysX

  • Problems

    • Commercial licensing

      • Free for non-commercial projects

      • $50k per SKU for commercial products

    • Currently no killer game to show off the processor

      • But, they’re on their way

    • Limited availability of PhysX cards


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Ageia PhysX

  • Who’s using PhysX?

    • Partners

    • Other Developers


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Ageia PhysX

  • API

    • C++

    • Primitives

      • Box (AABB, OBB), sphere, capsule, plane, line, ray, height map, convex mesh, triangular mesh

    • Joints

      • Spherical, revolute, prismatic, cylindrical, fixed, distance, point in plane, point on line, pulley, 6DOF


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Ageia PhysX

  • Tools

    • PhysX Create

      • Plugins for 3DS Max and Maya

    • PhysX Rocket

      • Preview and tuning of content

    • PhysX VRD

      • Real-time visual remote debugger


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Ageia PhysX

  • Demos

    • GRAW comparison of PhysX processor

    • Fluid Dynamics (Fog, Napalm)

    • Artificial Studios Cellfactor

    • Bet on Soldier: Blood Sport


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Open Dynamics Engine (ODE)

  • Rob needs to get off his lazy butt and fill this in

Wunderverbindungen


Open dynamics engine ode18 l.jpg
Open Dynamics Engine (ODE)

  • Features

    • Open Source

    • Platform independent

    • Rigid Body Dynamics (V3)

      • Vehicles

      • Virtual Reality Environments

      • Virtual Creatures


Open dynamics engine ode19 l.jpg
Open Dynamics Engine (ODE)

  • Features (cont’d)

    • Collision Detection

    • Collision Handling

    • Friction

    • Three different Joints


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Open Dynamics Engine (ODE)

  • Problems

    • Traded Accuracy for Speed and Stability

    • 2 Years since last release

    • 2 + Months since last “Nightly Build”

    • Samples crash or don’t work


Open dynamics engine ode21 l.jpg
Open Dynamics Engine (ODE)

  • Who’s using ODE?

    • 87 linked users

    • Games & Game Engines

      • 3Impact

      • Gryps Engine

    • Tools

      • Juice

      • Blender

    • Simulators


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Havok

  • Industry Standard

  • Used in Half Life 2, Halo 2, F.E.A.R., and many other blockbuster games.

  • Also used in the Jupiter EX game engine.

  • Very expensive (they won’t even give you a price if you don’t work for EA)

  • Joining with nVidia to use the GPU for physics calculations.


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Physics and Ogre

  • OgreODE

    • Adds prefab vehicles and rag-doll support

  • OgreNewt

    • Implements nearly all of Newton’s functionality

  • NxOgre

    • Adds state machine support



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