transparency - Swift | Ignore transparent parts of sprite when detecting collisions? -


i want detect collisions every part of sprite except transparent parts. found solution c can't figure out how in swift.

here's obj-c solution: sprite kit collisions: ignore transparency?

anyone have idea?

edit:

here's function code building shape. i'm not sure how set spritename.physicsbody answer supplied below user. 

func addtriangles() {       center = skspritenode(imagenamed:"images/center.png")     center.position = cgpoint(x: cgrectgetmidx(self.frame), y: cgrectgetmidy(self.frame))     center.zposition = -1     center.physicsbody = init!(texture centertexture: sktexture!, size 1.0: cgsize) -> skphysicsbody?     center.physicsbody?.dynamic = false     center.physicsbody?.affectedbygravity = false     center.physicsbody?.categorybitmask = physicscategory.triangle     self.addchild(center)     spin = clockwise     center.runaction(skaction.repeatactionforever(spin))   }

you can use 

init!(texture texture: sktexture!, size size: cgsize) -> skphysicsbody?

to set collision body alpha channel of texture of sprite

however, not recommended because costs lot simulate complicated shape's physics behaviour.

if have sprite complicated shape, try draw simpler shape , use texture physics body.


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