applyAngularVelocity causes error when called right after object instantiation

Posted by Appeltaart on Game Development See other posts from Game Development or by Appeltaart
Published on 2014-05-14T13:12:51Z Indexed on 2014/06/02 21:50 UTC
Read the original article Hit count: 213

Filed under:

cocos2d

|

objective-c

|

chipmunk

I'm trying to make a physicsBody rotate as soon as it is instantiated.

CCNode* ball = [CCBReader load:@"Ball"]; [ball.physicsBody applyForce:force]; [ball.physicsBody applyAngularImpulse:arc4random_uniform(360) - 180];

Applying force works fine, the last line however throws an error in cpBody.c line 123: cpAssertHard(body->w == body->w && cpfabs(body->w) != INFINITY, "Body's angular velocity is invalid.");

When I don't apply force and merely rotate the problem persists. If I send applyAngularImpulse at some later point (in this case on a touch) it does work. Is this function not supposed to be called right after instantiation, or is this a bug?

© Game Development or respective owner

Related posts about cocos2d

difference between cocos2d-x vs cocos2d-js

as seen on Game Development - Search for 'Game Development'
I'm just moving towards native apps... A friend of mine told me to start with cocos2d, I'm good in javascript. while searching google for cocos2d, and within cocos2d-x.org i found cocos2d-x cocos2d-JSB cocos2d-html5 cocos2d-Javascript I know what cocos2d-x is for.. and what cocos2d-html5 is for… >>> More
Cocos2d-x v3 invalid conversion from 'cocos2d::Layer* [on hold]

as seen on Game Development - Search for 'Game Development'
Hello guys I'm learning cocos2d-x v3 right but most of the code that I can find is to the version 2. My specific error is this one, when I try to compile my cocos2s-x 3 project this error shows. invalid conversion from 'cocos2d::Layer to Game* [-fpermisive]* What I want to do is create a new game… >>> More
Cocos2d-x Spritebatch node animation appears to be broken? cocos2d-x 2.0.3

as seen on Game Development - Search for 'Game Development'
Hi I have spent aprox 2 days trying to get this to work doing a google searches left and right and I did get it working except for sprite batch nodes. So in my class I am able to load kuwalio_stand.png and I tested kuwalio_walk1.png and 2 and 3 from the FrameCache(). They work for sure 100%. I run… >>> More
Spritebatch node animation appears to be broken in cocos2d-x 2.0.3

as seen on Game Development - Search for 'Game Development'
Hi I have spent aprox 2 days trying to get this to work doing a google searches left and right and I did get it working except for sprite batch nodes. So in my class I am able to load kuwalio_stand.png and I tested kuwalio_walk1.png and 2 and 3 from the FrameCache(). They work for sure 100%. I run… >>> More
Cocos2d+pybox2d vs Cocos2d-Iphone

as seen on Game Development - Search for 'Game Development'
I'm now working with two guys for making our first pc indie game and we decide to use cocos2d+pybox2d ( yeah , 2d python game :) ). We decide this based on what i seen in cocos2d iphone games , but i don't get very clear if cocos2d-iphone is just a porting with just a little more features or is far… >>> More

Related posts about objective-c

Blocking access to websites with objective-C / root privileges in objective-C

as seen on Stack Overflow - Search for 'Stack Overflow'
I am writing a program in Objective-C (XCode 3.2, on Snow Leopard) that is capable of either selectively blocking certain sites for a duration or only allow certain sites (and thus block all others) for a duration. The reasoning behind this program is rather simple. I tend to get distracted when I… >>> More
Objective-C with some Objective-C++, calling a normal c++ method "referenced from" problem

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I made an Objective-C project for the iPhone. I had only one cpp class, the soundEngine taken from some Apple demo. Now I'm trying to merge OpenFeint which is coded in Objective-C++. As soon as I drop in the code without even referring to it from my code, when I hit Build, my Objective-C code… >>> More
Add an objective @property attribute in objective-c

as seen on Stack Overflow - Search for 'Stack Overflow'
Does anyone know of a way to add additional attribute types to the @property keyword without modifying the compiler? Or can anyone think of another way to genericize getter/setter creation? Basically, I have a lot of cases in a recent project where it's handy for objects to lazily instantiate their… >>> More
ObjectiveC builtin template system ?

as seen on Stack Overflow - Search for 'Stack Overflow'
I am developing an iPhone application and I use HTML to display formatted text. I often display the same webpage, but with a different content. I would like to use a template HTML file, and then fill it with my diffent values. I wonder if ObjectiveC has a template system similar to ERB in Ruby. That… >>> More
ObjectiveC Syntax for Specifying Protocol Name in Method Argument

as seen on Stack Overflow - Search for 'Stack Overflow'
What's the ObjectiveC syntax for specifying a protocol as an argument in a method? Say I have 2 protocols, MyProtocol and MyProtocolCB: @protocol MyProtocolCB <NSObject> - (void) func; @end @protocol MyProtocol <NSObject> - (void) register:(MyProtocolCB*) cb; @end I'm receiving this… >>> More