physical representation of a game character. basics 05_02_bullet_charactercontrol_base.zip extract
TRANSCRIPT
Physics Character Controller
Physical representation of a game character
Basicshttp://cg.iit.bme.hu/gamedev/KIC/
05_PhysicsEngine/05_02_Bullet_CharacterControl_Base.zipExtractRun: CharacterControl.slnSet include and library paths (if not correct)Set working directory (if not
$(SolutionDir)/bin)CompileRun
Run
ExerciseGive the character a physical representationUse a capsule shape as a bounding objectMake the capsule dynamicDisable rotationAdd forces to move it in the sceneThe 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)
PlayerCharacter.h#include "btBulletDynamicsCommon.h"
class PlayerCharacter{public: PlayerCharacter(Ogre::SceneManager* sm, btDiscreteDynamicsWorld*
phyW);
protected: btRigidBody* mPhysicsController;
PlayerCharacter.cppPlayerCharacter::PlayerCharacter(Ogre::SceneManager* sm, btDiscreteDynamicsWorld* phyW){
… btCollisionShape* physicsShape = new btCapsuleShape(2.0,5.0);
btDefaultMotionState* physicsMotionState = new btDefaultMotionState(btTransform(btQuaternion(0,0,0,1), btVector3(0,5,0))); btScalar mass = 1; btVector3 inertia(0,0,0); physicsShape->calculateLocalInertia(mass,inertia);
btRigidBody::btRigidBodyConstructionInfo rigidBodyCI(mass, physicsMotionState, physicsShape, inertia); mPhysicsController = new btRigidBody(rigidBodyCI);
mPhysicsController->setAngularFactor(0); //disable rotation//mPhysicsController->setDamping(0.3,0);
phyW->addRigidBody(mPhysicsController);}
PlayerCharacter.cppvoid PlayerCharacter::update(float t, float dt){
… btTransform worldTrans;
mPhysicsController->getMotionState()->getWorldTransform(worldTrans);
//we don’t need rotation as it is fixed//btQuaternion rot = 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));
}
PlayerCharacter.cppvoid 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;
elseaction = PA_NONE;
pose = PP_RUN;}
OgreCharacter.cppplayerCharacter = new
PlayerCharacter(sceneManager, physxHandler->getScene());
Test
More physicsConstraints/jointsRay casting (bullets, terrain, vehicle)Complex geometries
ConvexConcaveHeight field
Collision filteringSoft bodiesParticles, fluids
The End