Physics behave different in iphone and ipad air simulator

cocos2d-x C++
#1

cocos2dx 3.17.1 version
(chipmunk physics and Box2d physics )
i just create 1 ball body and apply velocity Vec2(0,100);
in iphone simulator when i apply velocity ball is jump up to middle of the screen but in the ipad air simulator it behave not like this

in ipad air simulator it jump up to 1/4 part of screen.
i try lost of diff diff things but not working i am stuck in this please someone help me

i also try box2d but the problem is same in box2d also.
@slackmoehrle @smitpatel88

#2

3 points:

  1. For gaming you should always avoid simulator. Always use physical device for iOS & Android both. I use simulator just for game launch testing. whether game is launching for different OS version, like that.
  2. I will prefer Box2d for such requirement
  3. Play with dt, read details for physics delta time.
1 Like
#3

is it require to multiply velocity with dt . in my all past project i never multiply any velocity with dt

#4

You should use fixed time step for this.
Check forum for such posts and google it as well.

#5

this problem is also happen in real device also in chipmunk physics .
but is i set ResolutionPolicy::EXACT_FIT . then this issue is not happen

#6

Thats different issue. Read more about how to support multiresolution.