cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   Dennis
   Member

   Hello,

   I'm using a point particle system and having trouble getting something I'd like to do to work. Help is appreciated.

   Can I start a particle system a few seconds into it? I have snow particles that continuously fall from the top of the screen. When the game starts I'd like snow to already be falling all over the screen. Currently it starts at the top of the screen when the game starts.

   I couldn't find this information anywhere and experimenting didn't turn up anything useful.

   I'm using .8.2

   Thanks very much.

   Posted 1 year ago #
2. 

   zenkimoto
   Member

   1. You could initialize the system and call stopSystem and resetSystem when you want to start it up.

   2. Cocos2d allocates it's particles on init, so I don't think this is possible with the Cocos2d particle system. You could try and create a custom one. There is a totalParticles property, but that is not meant to be dynamic. Not sure why it's not read only.

   Hope this helps.

   Posted 1 year ago #
3. 

   Clain
   Member

   This thread may be of interest : http://www.cocos2d-iphone.org/forum/topic/2496

   Posted 1 year ago #
4. 

   mobilebros
   Moderator

   Theres been discussion on this.... with no solution found.... except! I kinda hacked something together out of disgust for it not working. Heres what I did in 8.2:

   I created a ParticleRain system first, and then tried to manually call step 10 times.

   for (int i = 0; i < 10; i++)
       [rain step:1.0/20.0f];

   To my great surprise this did not work, I decided to debug.... for some reason once inside the step routine my value was always ZERO!! I spent a little time on this before giving up and throwing in this hack in the particlesystem.m

   -(void) step: (ccTime) dt
   {
       if (!dt)
   	dt = 1.0f/20.0f;

   It worked great! Doing this type of thing is a bad idea... that said, if anyone finds out the REAL way to do this though... I'm all ears :)

   Posted 1 year ago #

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