I successfully reproduce this bug in a testbed example :
SuperStrict
Framework BaH.Box2d
Import BRL.GLMax2D
Import "test.bmx"
Graphics 800,600, 0
SetBlend alphablend
Run(New ApplyForce.Create(), New TSettings)
Type ApplyForce Extends Test
Field m_body:b2Body
Method Create:ApplyForce()
Init()
m_world.SetGravity(New b2Vec2.Create(0.0, 0.0))
Local bodyDef:b2BodyDef = New b2BodyDef
Local specialWall:b2PolygonDef = New b2PolygonDef
Local v:b2Vec2[] = New b2Vec2[4]
' fail with negative (counter-clockwise)
v[0] = Vec2(10.0, - 2.0)
v[1] = Vec2(2.0, - 9.0)
v[2] = Vec2(2.0, - 10.0)
v[3] = Vec2(10.0, - 3.0)
specialWall.SetVertices(v)
bodyDef.SetPosition(New b2Vec2.Create(- 5.0, 0.0))
m_world.CreateBody(bodyDef).CreateShape(specialWall)
' fait with positive (counter-clockwise)
v[3] = Vec2(10.0, 9.0)
v[2] = Vec2(2.0, 2.0)
v[1] = Vec2(2.0, 3.0)
v[0] = Vec2(10.0, 10.0)
specialWall.SetVertices(v)
bodyDef.SetPosition(New b2Vec2.Create(- 5.0, 0.0))
m_world.CreateBody(bodyDef).CreateShape(specialWall)
Local bd:b2BodyDef = New b2BodyDef
Local sd1:b2PolygonDef = New b2PolygonDef
sd1.SetAsBox(1, 1)
' event this won't do it
' Local vertices:b2Vec2[] = New b2Vec2[4]
' vertices[0] = Vec2(0.0, 0.0)
' vertices[1] = Vec2(1.0, 0.0)
' vertices[2] = Vec2(1.0, 2.0)
' vertices[3] = Vec2(0.0, 2.0)
' sd1.SetVertices(vertices)
sd1.SetDensity(4.0)
sd1.SetRestitution(0.25)
sd1.SetFriction(0.01)
bd = New b2BodyDef
bd.SetFixedRotation(True)
bd.SetPosition(New b2Vec2.Create(0.0, 0.0))
m_body = m_world.CreateBody(bd)
m_body.CreateShape(sd1)
m_body.SetMassFromShapes()
Return Self
End Method
Method Keyboard()
Super.Keyboard()
Local p:b2Vec2 = m_body.GetWorldPoint(New b2Vec2.Create(0.0, 0.0))
If KeyDown(KEY_UP) Then
m_body.ApplyForce(New b2Vec2.Create(0, 200), p)
End If
If KeyDown(KEY_LEFT)
m_body.ApplyForce(New b2Vec2.Create(- 200, 0), p)
End If
If KeyDown(KEY_RIGHT)
m_body.ApplyForce(New b2Vec2.Create(200, 0), p)
End If
If KeyDown(KEY_DOWN)
m_body.ApplyForce(New b2Vec2.Create(0, - 200), p)
End If
End Method
End Type
And I try to reproduce this bug in the C++ TestBed of Box2d but everything work as intended !ApplyForce.h file modified :
/*
* Copyright (c) 2006-2007 Erin Catto <a href="http://www.gphysics.com" target="_blank">http://www.gphysics.com</a>
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#ifndef APPLY_FORCE_H
#define APPLY_FORCE_H
class ApplyForce : public Test
{
public:
ApplyForce()
{
m_world->SetGravity(b2Vec2(0.0f, 0.0f));
{
b2BodyDef bd;
bd.position.Set(0.0f, 10.0f);
b2Body* ground = m_world->CreateBody(&bd);
b2PolygonDef sd;
sd.vertexCount = 4;
sd.vertices[0] = b2Vec2(10.0f, -2.0f);
sd.vertices[1] = b2Vec2(2.0f, -9.0f);
sd.vertices[2] = b2Vec2(2.0f, -10.0f);
sd.vertices[3] = b2Vec2(10.0f, -3.0f);
ground->CreateShape(&sd);
sd.vertices[0] = b2Vec2(10.0f, 10.0f);
sd.vertices[1] = b2Vec2(2.0f, 3.0f);
sd.vertices[2] = b2Vec2(2.0f, 2.0f);
sd.vertices[3] = b2Vec2(10.0f, 9.0f);
bd.position.Set(0.0f, 10.0f);
ground->CreateShape(&sd);
}
{
b2PolygonDef sd1;
sd1.SetAsBox(1.0f,1.0f);
// sd1.vertexCount = 4;
// sd1.vertices[0] = b2Vec2(0.0f, 0.0f);
// sd1.vertices[1] = b2Vec2(1.0f, 0.0f);
// sd1.vertices[2] = b2Vec2(1.0f, 2.0f);
// sd1.vertices[3] = b2Vec2(0.0f, 2.0f);
sd1.density = 2.0f;
b2BodyDef bd;
bd.angularDamping = 2.0f;
bd.linearDamping = 0.1f;
bd.fixedRotation = true;
bd.position.Set(0.0f, 5.0f);
bd.angle = b2_pi;
m_body = m_world->CreateBody(&bd);
m_body->CreateShape(&sd1);
m_body->SetMassFromShapes();
}
}
void Keyboard(unsigned char key)
{
switch (key)
{
case 'i':
{
b2Vec2 f = m_body->GetWorldVector(b2Vec2(0.0f, -400.0f));
b2Vec2 p = m_body->GetWorldPoint(b2Vec2(0.0f, 0.0f));
m_body->ApplyForce(f, p);
}
break;
case 'k':
{
b2Vec2 f = m_body->GetWorldVector(b2Vec2(0.0f, 400.0f));
b2Vec2 p = m_body->GetWorldPoint(b2Vec2(0.0f, 0.0f));
m_body->ApplyForce(f, p);
}
break;
case 'j':
{
b2Vec2 f = m_body->GetWorldVector(b2Vec2(400.0f, 0.0f));
b2Vec2 p = m_body->GetWorldPoint(b2Vec2(0.0f, 0.0f));
m_body->ApplyForce(f, p);
}
break;
case 'l':
{
b2Vec2 f = m_body->GetWorldVector(b2Vec2(-400.0f, 0.0f));
b2Vec2 p = m_body->GetWorldPoint(b2Vec2(0.0f, 0.0f));
m_body->ApplyForce(f, p);
}
break;
}
}
static Test* Create()
{
return new ApplyForce;
}
b2Body* m_body;
};
#endifErin tells me
-"
There was a bug with polygon collision in a pre-2.0 version."
So maybe you need to update you SVN code ?
