skphysicsbody

I want to move a physicsBody with the applyImpulse method in a direction based on the physicsBody rotation. Foe example, the physicsBody is a square in shape, I call a "move" which will apply an impulse to make it move up vertically. I then call a method to rotate the physicsBody 45 degrees right. If I call the "move" method again, the physicsBody will move diagonally right and up. Can anyone help please? I suggest that you follow Sprite Kit’s coordinate and rotation conventions. Specifically, your sprite image should be facing right at zero degrees (the default value), and a positive value is

As I am porting an iPhone app that uses SpriteKit to iPad, I have been able to scale all the screen elements and font sizes using the height ratio of the iPhone 5 to iPad screen. Everything looks proportional, except for the physics since there is more area. So the question is, how do I scale the physics along with the screen using that height ratio? Perhaps changing density or mass of all the nodes? How would I do it, mathematically using the ratio so that it is perfect? You can configure the SKPhysicsWorld object attached to the SKScene . It changes: The gravity property that applies an

I am developing a game using Sprite-Kit (Objective-C). It's a game where you control a bird in flight and arrows and other bad projectiles are shot at you from the right/top/bottom sides of the screen. I am using physics instead of an SKAction in order to accomplish this as I want it to seem as life-like as possible. So I know to use applyImpulse on the projectile to shoot it towards the bird, but what I am wondering is how can gaurantee that the projectile will be shot directly at the bird, no matter the y-positioning of the bird and the y-positioning of the projectile prior to applyImpulse?

I am trying to create simple Joints between two SKPhysicsBodies. But, they are acting weirdly. I am well aware of the fact the anchor points should be on scene coordinate. Please have a look at the Source code attached. For Example this is how a fixed Joint results after attaching a small square on a rectangle. -(void)createFixedJointOnScene:(SKScene*)scene { //Adding Rectangle SKSpriteNode* backBone = [[SKSpriteNode alloc] initWithColor:[UIColor whiteColor] size:CGSizeMake(20, 200)]; backBone.position = CGPointMake(CGRectGetWidth(self.frame)/2.0, CGRectGetHeight(self.frame)/2.0); backBone

It is hard to describe in plain text, so I recorded a GIF to demonstrate. https://public.lightpic.info/image/2B1F_582465841.gif I am currently working on a project that requires such effect. Up to now I have finished a similar effect on iOS with SpriteKit, however unfortunately it turns out the result is not pretty satisfying. This is my work: in my project there is an object with an irregular shape, a constant force is applied at somewhere below the gravity center of the object and its direction is downward. I have made it a rule that the object's coordinate cannot be changed by the force, so

I have two SKShapeNodes – one with an edge-based SKPhysicsBody, one volume-based – and I want to detect their intersection without collision. I've got this working fine, with the SKPhysicsContactDelegate contact methods getting called as one passes over another, but my issue is that didEndContact gets called when the edges no longer intersect, even when one body is completely contained within the other. What's the best way to determine true contact or overlap, not just edge intersection? I've tried usesPreciseCollisionDetection , to no avail. CGPoint locObj1 = [sprite1 locationInNode:self];