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Physics Character Controller

Physics Character Controller. Physical representation of a game character. Basics. http://cg.iit.bme.hu/gamedev/KIC/05_PhysicsEngine/ 05_02_Bullet_CharacterControl _ Base . zip Extract Run : CharacterControl . sln Set i nclude and library paths (if not correct)

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Physics Character Controller

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  1. PhysicsCharacter Controller Physical representation of a game character

  2. Basics • http://cg.iit.bme.hu/gamedev/KIC/05_PhysicsEngine/ • 05_02_Bullet_CharacterControl_Base.zip • Extract • Run: CharacterControl.sln • Set includeandlibrarypaths (if not correct) • Set workingdirectory(if not $(SolutionDir)/bin) • Compile • Run

  3. Run

  4. Exercise • Give the character a physical representation • Use a capsule shape as a bounding object • Make the capsule dynamic • Disable rotation • Add forces to move it in the scene • The physical representation of the scene is already loaded (static boxes)(examine the source code!!) • Play with the parameters until the movement feels natural • (Next slides show one solution)

  5. PlayerCharacter.h #include "btBulletDynamicsCommon.h" classPlayerCharacter { public: PlayerCharacter(Ogre::SceneManager* sm,btDiscreteDynamicsWorld* phyW); protected: btRigidBody* mPhysicsController;

  6. PlayerCharacter.cpp PlayerCharacter::PlayerCharacter(Ogre::SceneManager* sm, btDiscreteDynamicsWorld* phyW) { … btCollisionShape* physicsShape = newbtCapsuleShape(2.0,5.0); btDefaultMotionState* physicsMotionState = newbtDefaultMotionState(btTransform(btQuaternion(0,0,0,1), btVector3(0,5,0))); btScalarmass = 1; btVector3 inertia(0,0,0); physicsShape->calculateLocalInertia(mass,inertia); btRigidBody::btRigidBodyConstructionInforigidBodyCI(mass, physicsMotionState, physicsShape, inertia); mPhysicsController = newbtRigidBody(rigidBodyCI); mPhysicsController->setAngularFactor(0); //disable rotation //mPhysicsController->setDamping(0.3,0); phyW->addRigidBody(mPhysicsController); }

  7. PlayerCharacter.cpp void PlayerCharacter::update(float t, float dt) { … btTransformworldTrans; mPhysicsController->getMotionState()->getWorldTransform(worldTrans); //we don’t need rotation as it is fixed //btQuaternionrot = worldTrans.getRotation(); //node->setOrientation(rot.w(), rot.x(), rot.y(), rot.z()); node->setPosition(worldTrans.getOrigin().x(), worldTrans.getOrigin().y()-5, worldTrans.getOrigin().z()); mPhysicsController->setLinearVelocity(btVector3(0,0,0)); }

  8. PlayerCharacter.cpp void PlayerCharacter::move(float amount) { if(inAction()) return; Ogre::Vector3 m = amount * getDirection() * 150; Ogre::LogManager::getSingleton().logMessage("Applying force: " + Ogre::StringConverter::toString(m)); mPhysicsController->activate(true); mPhysicsController->applyImpulse(btVector3(m.x,m.y,m.z), btVector3(0,-0.5,0)); if(hasWeapon) action = PA_WEAPON_HOLD; else action = PA_NONE; pose = PP_RUN; }

  9. OgreCharacter.cpp playerCharacter = new PlayerCharacter(sceneManager, physxHandler->getScene());

  10. Test

  11. More physics • Constraints/joints • Ray casting (bullets, terrain, vehicle) • Complex geometries • Convex • Concave • Height field • Collision filtering • Soft bodies • Particles, fluids

  12. The End

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