This works fine
INIT
sprite->setPhysicsBody(physicsBody);
sprite->setPhysicsBody(physicsBodyShield);
The sprite is assigned one and then the other, the other remains active of course
However, this doesn’t work, breaks
INIT
sprite->setPhysicsBody(physicsBody);
UPDATE
sprite->setPhysicsBody(physicsBodyShield);
I’m aware there are other threads about this but no solution that I could understand or get working
How can we swap Physics Bodies during game play ? Thanks
Try first setting nullptr
In Update:
sprite->setPhysicsBody(nullptr);
sprite->setPhysicsBody(physicsBodyShield);Nah Still breaks 
okay.
If you are using latest version then try with addComponent & removeComponent
That should work.
sprite->removeComponent(physicsBody);
//sprite->addComponent(physicsBodyShield);
sprite->setPhysicsBody(physicsBodyShield);
Tried both with comments and without , still breaks when set new body or when set new component
For me its working, i had done in lots of games.
I will try to check in simple helloworld and will let you know.
Well let me explain a little further first…
I have a Vehicle Class… The class constructor set up vehicle and sets up two physics bodies
Vehicle::Vehicle()
{
//CAR SPRITE
sprite = Sprite::create("Ship/VehicleOne/vehicleOne.png");
sprite->setPosition(Vec2(-2550 / TIscale, 1000 / TIscale));
//PHYSICS BODY
mArray[0] = cocos2d::Vec2(-26 / TIscale, -3 / TIscale);
mArray[1] = cocos2d::Vec2(-22 / TIscale, -6 / TIscale);
mArray[2] = cocos2d::Vec2(35 / TIscale, -3 / TIscale);
mArray[3] = cocos2d::Vec2(37 / TIscale, -1 / TIscale);
mArray[4] = cocos2d::Vec2(37 / TIscale, 1 / TIscale);
mArray[5] = cocos2d::Vec2(35 / TIscale, 3 / TIscale);
mArray[6] = cocos2d::Vec2(-22 / TIscale, 6 / TIscale);
mArray[7] = cocos2d::Vec2(-26 / TIscale, 3 / TIscale);
mArray[8] = cocos2d::Vec2(-26 / TIscale, -3 / TIscale);
physicsBody = PhysicsBody::createPolygon(mArray, 9, PhysicsMaterial(1, 0, 0));
physicsBody->setCollisionBitmask(4);
physicsBody->setContactTestBitmask(true);
physicsBody->setAngularDamping(10);
physicsBody->setDynamic(true);
//sprite->setPhysicsBody(physicsBody);
//SHIELD PHYSCIS BODY INITIALIZED FOR LATER USE
shieldArray[0] = cocos2d::Vec2(-30 / TIscale, -13 / TIscale);
shieldArray[1] = cocos2d::Vec2(-36 / TIscale, -9 / TIscale);
shieldArray[2] = cocos2d::Vec2(-40 / TIscale, -2 / TIscale);
shieldArray[3] = cocos2d::Vec2(-40 / TIscale, 2 / TIscale);
shieldArray[4] = cocos2d::Vec2(-36 / TIscale, 9 / TIscale);
shieldArray[5] = cocos2d::Vec2(-30 / TIscale, 13 / TIscale);
shieldArray[6] = cocos2d::Vec2(40 / TIscale, 12 / TIscale);
shieldArray[7] = cocos2d::Vec2(47 / TIscale, 7 / TIscale);
shieldArray[8] = cocos2d::Vec2(50 / TIscale, 2 / TIscale);
shieldArray[9] = cocos2d::Vec2(50 / TIscale, -2 / TIscale);
shieldArray[10] = cocos2d::Vec2(47 / TIscale, -7 / TIscale);
shieldArray[11] = cocos2d::Vec2(40 / TIscale, -12 / TIscale);
shieldArray[12] = cocos2d::Vec2(-30 / TIscale, -13 / TIscale);
physicsBodyShield = PhysicsBody::createPolygon(shieldArray, 13, PhysicsMaterial(0, 0, 0));
physicsBodyShield->setCollisionBitmask(4);
physicsBodyShield->setContactTestBitmask(true);
physicsBodyShield->setAngularDamping(10);
physicsBodyShield->setDynamic(true);
sprite->setPhysicsBody(physicsBody);
}
Then I have a fucntion that is called in the scene class by pressing space bar like so
void Vehicle::deployShield()
{
shieldStatus = false;
//VEHICLE SPRITE WITH SHIELD - WORKING ON IT
//sprite = Sprite::create("Ship/VehicleOne/vehicleOneShield.png");
//sprite->removeComponent(physicsBody);
//sprite->addComponent(physicsBodyShield);
//sprite->setPhysicsBody(physicsBodyShield);
}
This is in a keyboard listener function in first world after space bar is pressed, loads of the other weapons work fine with exactly shame functions
if (playerVehicleObject->getShieldStatus())
{
CCLOG("SHIELD ACTIVATED - WORKING ON THIS");
weaponTimer = 0;
activeWeaponTimer = true;
playerVehicleObject->deployShield();
}Which version you are using?
I tried in simple helloworld and its working fine in 3.14.1
In init
sp = Sprite::create("image.png");
sp->setPosition(viewSize / 2);
this->addChild(sp);
pb = PhysicsBody::createCircle(36);
sp->addComponent(pb);
On Space bar press:
sp->removeComponent(pb);
PhysicsBody *pb2 = PhysicsBody::createCircle(72);
sp->addComponent(pb2);Ok I’m going to download Cocos2-x new from site and install, then generate new solution, then drag all classes over and build !!
Ill be back
Weird thing here look
//CONSTRUCTOR - DE-CONSTRUCTOR
Vehicle::Vehicle() ://WE INITIALIZE ALL VARIABLES TO DEFAULT VALUES
trusterStatus(false),
machineGunStatus(false),
rocketStatus(false),
shieldStatus(true),
mineStatus(false),
velocityPoint(cocos2d::Vec2(0, 0)),
angle_I(0.0), angle_II(0.0),
slowDown(false),
m_speed(0.0),
driveStatus(true),
bulletSpawnPoint(cocos2d::Vec2(0, 0)),
bulletFirePoint(cocos2d::Vec2(0, 0)),
weaponStatus("Empty"),
position(Vec2(0, 0)),
TIScale(1.7068),//1.7068
steeringPower(5),
autoDrive(false),
angle_III(0.0),
driveOffTimer(5),
machineGunVelocity(500),
machineGunSpawnGap(50),
m_health(100),
bullets(10),
accelerateLock(false),
de_accelerateLock(false),
rocketSpeed(200),
shieldLock(false)
{
//CAR SPRITE
sprite = Sprite::create("Ship/VehicleOne/vehicleOne.png");
sprite->setPosition(Vec2(-2550 / TIscale, 1000 / TIscale));
//PHYSICS BODY
mArray[0] = cocos2d::Vec2(-26 / TIscale, -3 / TIscale);
mArray[1] = cocos2d::Vec2(-22 / TIscale, -6 / TIscale);
mArray[2] = cocos2d::Vec2(35 / TIscale, -3 / TIscale);
mArray[3] = cocos2d::Vec2(37 / TIscale, -1 / TIscale);
mArray[4] = cocos2d::Vec2(37 / TIscale, 1 / TIscale);
mArray[5] = cocos2d::Vec2(35 / TIscale, 3 / TIscale);
mArray[6] = cocos2d::Vec2(-22 / TIscale, 6 / TIscale);
mArray[7] = cocos2d::Vec2(-26 / TIscale, 3 / TIscale);
mArray[8] = cocos2d::Vec2(-26 / TIscale, -3 / TIscale);
physicsBody = PhysicsBody::createPolygon(mArray, 9, PhysicsMaterial(1, 0, 0));
physicsBody->setCollisionBitmask(4);
physicsBody->setContactTestBitmask(true);
physicsBody->setAngularDamping(10);
physicsBody->setDynamic(true);
//sprite->setPhysicsBody(physicsBody);
//SHIELD PHYSCIS BODY INITIALIZED FOR LATER USE
shieldArray[0] = cocos2d::Vec2(-30 / TIscale, -13 / TIscale);
shieldArray[1] = cocos2d::Vec2(-36 / TIscale, -9 / TIscale);
shieldArray[2] = cocos2d::Vec2(-40 / TIscale, -2 / TIscale);
shieldArray[3] = cocos2d::Vec2(-40 / TIscale, 2 / TIscale);
shieldArray[4] = cocos2d::Vec2(-36 / TIscale, 9 / TIscale);
shieldArray[5] = cocos2d::Vec2(-30 / TIscale, 13 / TIscale);
shieldArray[6] = cocos2d::Vec2(40 / TIscale, 12 / TIscale);
shieldArray[7] = cocos2d::Vec2(47 / TIscale, 7 / TIscale);
shieldArray[8] = cocos2d::Vec2(50 / TIscale, 2 / TIscale);
shieldArray[9] = cocos2d::Vec2(50 / TIscale, -2 / TIscale);
shieldArray[10] = cocos2d::Vec2(47 / TIscale, -7 / TIscale);
shieldArray[11] = cocos2d::Vec2(40 / TIscale, -12 / TIscale);
shieldArray[12] = cocos2d::Vec2(-30 / TIscale, -13 / TIscale);
physicsBodyShield = PhysicsBody::createPolygon(shieldArray, 13, PhysicsMaterial(0, 0, 0));
sprite->addComponent(physicsBody);
}
In this class I have a deploy shield function
void Vehicle::deployShield()
{
shieldStatus = false;
sprite->removeComponent(physicsBody);
sprite->addComponent(physicsBodyShield);
}
Now above caused null pointer error when i assign new physics body
BUT
If I do this, all im doing is moving that line of code from constructor to this function, it works, the creating physics Shield body… Then it works, why is that ? Do you have any idea ?
void Vehicle::deployShield()
{
shieldStatus = false;
sprite->removeComponent(physicsBody);
physicsBodyShield = PhysicsBody::createPolygon(shieldArray, 13, PhysicsMaterial(0, 0, 0));
sprite->addComponent(physicsBodyShield);
}Because its getting released as its not used.
Just retain when you are creating then it will work or create in deployshield method.
physicsBodyShield = PhysicsBody::createPolygon(shieldArray, 13, PhysicsMaterial(0, 0, 0));
physicsBodyShield->retain();