ios - Resizing a SpriteKit SKPhysicsBody created with SKPhysicsBody(circleOfRadius:) -


i building spritekit "chain reaction" game circles larger "explode". using skphysicsbody(circleofradius:) initializer create physics bodies circles.

unfortunately, these physics bodies don't seem re-size circles larger, , don't have exposed .radius property can set. there way resize physics body in spritekit, or need create new physics body every frame instead? (this have done below , code works fine, feels inefficient create new physics bodies in update loops.)

ps - know circles can accurate collision detection using trig distances, wanted use spritekit collision detection other effects.

func movecircles(dt:cgfloat){    enumeratechildnodeswithname("circle") { node, stop in      let c = node as! circlesprite      var halfwidth = c.size.width / 2.0      c.update(dt) // in update() exploding circles larger.          if c.isexploding{         // fixme: have make new physics body every update - don't this!             c.physicsbody = skphysicsbody(circleofradius: halfwidth)             c.physicsbody?.categorybitmask = collisioncategories.explodingcircle             c.physicsbody?.contacttestbitmask = collisioncategories.circle             c.physicsbody?.collisionbitmask = 0             c.physicsbody?.dynamic = true // default         }   } }

you might want read more here. resizing physicsbody not possible , recommended create new physicsbody , assign node.


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