SKEmitterNode Particle's actual position after positionRange

Question

End Goal: generate particles within an area (got that bit) that all accelerate to a point.

If I knew the position of the particle, everything would be fine, but I generate the particles with a particleRange, meaning I don't know the exact location of each particle.

Is there any way to retrieve the location of each particle after it has been generated?

My current plan is to attach a particleAction with a block that can read the final rendered position.

You could try with customAction seeing how it receives a node as parameter, I am interested what that node will be (not enough to test it my self) :). — Dobroćudni Tapir, Feb 03 '14 at 15:32
I tested this, when the action is attached to a particle the node is nil — Jordan, Feb 03 '14 at 23:05

Batalia · Answer 1 · 2014-02-03T11:55:45.853

No, as it says in the SKEmitterNode documentation, particles are objects privately owned by Sprite Kit, you cannot access them after they're generated, so the current position of each separate particle will not be retrievable. Thus, your plan of reading the position in the particle action block won't work, as the actions are only executed by new particles, which are not subject to manipulation/access as separate nodes.

You're left with setting their behaviour in advance using particleRange or particleAction. However, the SKCropNode class might be the way out - you can try masking the particle emitter, so that particles outside of your desired area are not rendered.

score 0 · Answer 2 · answered Feb 03 '14 at 23:09

0

Whilst the particle does not accelerate (I can live without that) I have been able to get them to all go to the desired location using:

emitterNode.particleAction = [SKAction moveTo:location duration:1];

Which is as close as it's going to get.

answered Feb 03 '14 at 23:09

Jordan

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SKEmitterNode Particle's actual position after positionRange

2 Answers2