cocos2d for iPhone

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

1. 

   pabloruiz55
   Member

   I have a weird problem i don't even know how to start solving.

   I have a pinball game, it uses chipmunk physics.
   It works fine in my 3g, in other 3gs. BUT when it was in review, apple rejected it beacuse the ball was getting stuck in somewhere when starting in a 3gs. After a couple of rejections it went through. i just re submited it, since i couldn't reproduce the bug in any device.
   Now a costumer is experiencing this problem.

   This post is very vague, sorry. But what could cause the simulation (i suppose) to fail in some devices and not in others with the same caracteristics?

   It uses the latest chipmunk and cocos2d, i tested it in simulator and device with all targets and it didn't fail once.

   Posted 1 year ago #
2. 

   Steve Oldmeadow
   Administrator

   Do you use a fixed timestep? One of the arguments for a fixed timestep is to guard against the simulation "blowing up".

   Posted 1 year ago #
3. 

   mobilebros
   Moderator

   I'll add in that if you don't use a fixed timestep, the iphone/ipod may chug for a split moment and that delay will cause your step function to get a larger than normal dt.... if the dt is large enough and the balls velocity is just high enough, chipmunk is going to calculate its position to a new distance that might be quite long lengthwise, thus making your ball "jump" thru walls/objects/etc, perhaps getting stuck in a crack or wall it otherwise wouldn't have.

   Posted 1 year ago #

RSS feed for this topic

Reply

You must log in to post.