cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   steg90
   Member

   Hi,

   I've set a body to b2_kinematicBody, but it isn't registering any collisions? I thought when it collides with another body, a collision should be registered? If it is dynamic, then the collision is registered, what am I doing wrong?!

   Regards,
   Steve

   Posted 1 year ago #
2. 

   steg90
   Member

   Ooops, its obvious, kinematicbodies only collide with dynamic bodies, lol.

   So, I've set it back to dynamic as want it to collide with static bodies (platforms), prob is, the body keeps moving down, i.e.it isn't staying with the sprite it is intended to be with? This is the code I have which I thought would make the body stay with the sprite:

   CGPoint screenPos = [self position];
   sprite.position = ccp(240 - screenPos.x, 160 - screenPos.y);
   b2Vec2 b2Position = b2Vec2(sprite.position.x/PTM_RATIO, (sprite.position.y)/PTM_RATIO);
   b->SetTransform(b2Position, 0); // Need to move body so always in centre

   Surely the body should stay with the sprite?

   Regards

   Posted 1 year ago #
3. 

   Questor
   Member

   steg90,

   A dynamic body will only stay stationary if absolutely no other force acts upon it. What I believe you are seeing is the effect of your gravity setting. Generally, with a physics engine, a sprite follows a physics body, not the other way around. If you really want to keep a dynamic body stationary, try using a mousejoint to "pin" it to your world at the coordinates of your sprite.

   Regards,
   Q

   Posted 1 year ago #
4. 

   steg90
   Member

   Thanks Questor, will take a look at mouse joint. I'm not applying any force to my dynamic body now though, just moving the layer instead but obviously as the player sprite is on this layer, it will move with it, hence, the SetTransform I'm using.

   Regards,
   Steve

   Posted 1 year ago #

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