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Sheeft
 Post subject: Re: 2.1 Manual Errata
PostPosted: Mon Jul 19, 2010 2:30 pm 
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Joined: Thu Apr 01, 2010 1:42 pm
Posts: 72
Under 8.7 Prismatic Joints :

Quote:
jointDef.motorForce = 1.0f;


instead of
Quote:
jointDef.maxMotorForce = 1.0f;


;)
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bindesh
 Post subject: Re: 2.1 Manual Errata
PostPosted: Wed Jul 28, 2010 4:16 am 
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Joined: Wed Jul 28, 2010 3:35 am
Posts: 2
4.3 Circle Shapes

b2CircleShape circle;
circle.m_p.Set(1.0f, 2.0f, 3.0f); // b2Vec3 used instead of b2Vec2
circle.m_radius = 0.5f;

On manual m_p is b2Vec2 but b2Vec3 is documented.
circle.m_p.Set( 1.0f, 2.0f, 3.0f ) ;


I have just started learning box2d from yesterday and found mostly older version ( Box2d 2.0 ) articles on web. But i learned 2.1 has good features so i am keeping it up.

Thank you for such a nice physics package.
;^)
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Remi Gillig
 Post subject: Re: 2.1 Manual Errata
PostPosted: Fri Aug 06, 2010 2:36 pm 
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Joined: Mon May 17, 2010 8:26 am
Posts: 13
Location: France
manual.pdf Box2D 2.1.2, page 44, 9.4 Contact Filtering

Code:
class MyContactListener : public b2ContactListener
{
public:
void BeginContact(b2Contact* contact)
{ // handle begin event }
void EndContact(b2Contact* contact)
{ // handle end event }
void PreSolve(b2Contact* contact, const b2Manifold* oldManifold)
{ // handle pre-solve event }
void PostSolve(b2Contact* contact, const b2ContactImpulse* impulse)
{ // handle post-solve event }
};


Should be

Code:
class MyContactListener : public b2ContactListener
{
public:
void BeginContact(b2Contact* contact)
{ /* handle begin event */ }
void EndContact(b2Contact* contact)
{ /* handle end event */ }
void PreSolve(b2Contact* contact, const b2Manifold* oldManifold)
{ /* handle pre-solve event */ }
void PostSolve(b2Contact* contact, const b2ContactImpulse* impulse)
{ /* handle post-solve event */ }
};


:geek:
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Rena
 Post subject: Re: 2.1 Manual Errata
PostPosted: Sat Feb 05, 2011 9:04 pm 
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Joined: Sat Feb 05, 2011 8:51 pm
Posts: 30
In chapter 10, Ray Casts section:
Quote:
You can use ray casts to do line-of-site checks
Should be "line-of-sight".
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bindesh
 Post subject: Re: 2.1 Manual Errata
PostPosted: Wed Feb 16, 2011 4:42 am 
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Joined: Wed Jul 28, 2010 3:35 am
Posts: 2
6.2 Fixture Creation

Section: Density
Line: The mass of a body is automatically adjusted when you ......

Nothing after you word. The statement is incomplete.
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Cloud07Studios
 Post subject: Re: 2.1 Manual Errata
PostPosted: Mon Feb 21, 2011 10:40 am 
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Joined: Mon Feb 21, 2011 10:28 am
Posts: 1
There is an issue with the example of a revolute joint's lifetime on page 34.

Chapter 8.3 Joint Factory

Here's an example of the lifetime of a revolute joint:
Code:
b2RevoluteJointDef jointDef;
jointDef.body1 = myBody1;
jointDef.body2 = myBody2;
jointDef.anchorPoint = myBody1->GetCenterPosition();
b2RevoluteJoint* joint = myWorld->CreateJoint(&jointDef);
... do stuff ...
myWorld->DestroyJoint(joint);
joint = NULL;



It took a rather long time to find the answer to this problem, but it would appear that joints cannot be created in this manner.
Instead they must be created like this.

b2RevoluteJoint* joint = (b2RevoluteJoint*)myWorld->CreateJoint(&jointDef);
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Rena
 Post subject: Re: 2.1 Manual Errata
PostPosted: Fri Mar 04, 2011 10:01 pm 
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Joined: Sat Feb 05, 2011 8:51 pm
Posts: 30
In the API documentation for b2World::GetContactList() (API/classb2_world.html):
Quote:
Warning:
contacts are
...are what?
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pTymN
 Post subject: Re: 2.1 Manual Errata
PostPosted: Wed May 11, 2011 5:24 pm 
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Joined: Tue Sep 25, 2007 2:22 pm
Posts: 482
Code:
jointDef.body1 = myBody1;
jointDef.body2 = myBody2;


In the manual, under gear joints, I see this code, but the constructor makes assumptions about the bodies on the joints from the b2GearJointDef and does not use the bodies from b2JointDef.
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Erin Catto
 Post subject: Re: 2.1 Manual Errata
PostPosted: Sun Aug 28, 2011 3:39 pm 
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Site Admin

Joined: Thu Sep 06, 2007 12:34 am
Posts: 2931
Thanks all. I have incorporated your feedback. I'll start a new thread once 2.2 is out.
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