Sometime cocos2d-x physics in my game is wrong?

cocos2d-x
#1

I wrote a game for test . In my game , there are coin and a ground . Coin contact with ground return true (can get through) but sometime (5%-10%) the coin go through the ground :frowning: . Is that my fault or cocos2d-x ??

#2

is the ground just a segment shape with no width?

then that will be easily penetrated by small or fast moving objects.

gitve the segment shape some width will solve this problem

#3

the ground width is 2 pixel ! but you’re right , I’ll make the ground thicker and test . Thank for support

#4

hey ! It doesn’t work ! I create edgebox with width 4 , then 10 pixel , the coin sometime just go throught (4pixel ground) , and sometime stuck in the space inside the ground (10 pixel-width-ground).

auto b = PhysicsBody::createEdgeBox(Size(_tileMap->getContentSize().width - 4,4));	
b->setContactTestBitmask(true);
b->setCollisionBitmask(GROUND_COLLISION_BITMASK);

onContactBegin

if ( ( COIN_COLLISION_BITMASK == a->getCollisionBitmask( )) 
|| ( COIN_COLLISION_BITMASK == b->getCollisionBitmask( )) )
    {
	if (COIN_COLLISION_BITMASK == a->getCollisionBitmask( ) && COIN_COLLISION_BITMASK == b->getCollisionBitmask( )) return false;

	if (GROUND_COLLISION_BITMASK == a->getCollisionBitmask( ) || GROUND_COLLISION_BITMASK == b->getCollisionBitmask( )) return true;
        return false;
    }