ios - SpriteKit circle particle effect -

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in ios spritekit. trying create sk particle emitter particle effect circle radius r. ideas how that? thanks!

the way achieved using color ramp, starting color 0 opacity, color 1% opacity near end of range , having third color 100% opacity actual circle.

here parameters used: particles: 800, maximum:0 lifetime: 1.1, range 0.2 (play , location of colors on color ramp set radius) position range: x=5, y=5 (not must) speed: 30 (should around value) acceleration: x=10, y=10 (small values here) alpha: start=0.3, range=1, speed: 0.1 (play these)


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