move deformable examples to a single folder and rename them; change license to google 2016

This commit is contained in:
Xuchen Han
2019-08-08 15:00:55 -07:00
parent 02c5b99b2f
commit 9a7e30d09f
17 changed files with 157 additions and 175 deletions

View File

@@ -1,4 +1,4 @@
SUBDIRS( HelloWorld BasicDemo )
SUBDIRS( HelloWorld BasicDemo)
IF(BUILD_BULLET3)
SUBDIRS( ExampleBrowser RobotSimulator SharedMemory ThirdPartyLibs/Gwen ThirdPartyLibs/BussIK ThirdPartyLibs/clsocket OpenGLWindow TwoJoint )
ENDIF()

View File

@@ -1,20 +0,0 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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 _DEFORMABLE_CONTACT_H
#define _DEFORMABLE_CONTACT_H
class CommonExampleInterface* DeformableContactCreateFunc(struct CommonExampleOptions& options);
#endif //_DEFORMABLE_CONTACT_H

View File

@@ -1,20 +0,0 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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 _DEFORMABLE_DEMO_H
#define _DEFORMABLE_DEMO_H
class CommonExampleInterface* DeformableCreateFunc(struct CommonExampleOptions& options);
#endif //_DEFORMABLE_DEMO_H

View File

@@ -1,17 +1,15 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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.
*/
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2016 Google Inc. http://bulletphysics.org
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.
*/
///create 125 (5x5x5) dynamic object
#define ARRAY_SIZE_X 5
@@ -27,7 +25,7 @@ subject to the following restrictions:
#define START_POS_Y -5
#define START_POS_Z -3
#include "DeformableContact.h"
#include "DeformableMultibody.h"
///btBulletDynamicsCommon.h is the main Bullet include file, contains most common include files.
#include "btBulletDynamicsCommon.h"
#include "BulletSoftBody/btDeformableRigidDynamicsWorld.h"
@@ -46,20 +44,20 @@ subject to the following restrictions:
#include "../CommonInterfaces/CommonMultiBodyBase.h"
#include "../Utils/b3ResourcePath.h"
///The DeformableContact demo deformable bodies self-collision
///The DeformableMultibody demo deformable bodies self-collision
static bool g_floatingBase = true;
static float friction = 1.;
class DeformableContact : public CommonMultiBodyBase
class DeformableMultibody : public CommonMultiBodyBase
{
btMultiBody* m_multiBody;
btAlignedObjectArray<btMultiBodyJointFeedback*> m_jointFeedbacks;
public:
DeformableContact(struct GUIHelperInterface* helper)
DeformableMultibody(struct GUIHelperInterface* helper)
: CommonMultiBodyBase(helper)
{
}
virtual ~DeformableContact()
virtual ~DeformableMultibody()
{
}
@@ -109,7 +107,7 @@ public:
}
};
void DeformableContact::initPhysics()
void DeformableMultibody::initPhysics()
{
m_guiHelper->setUpAxis(1);
@@ -237,7 +235,7 @@ void DeformableContact::initPhysics()
m_guiHelper->autogenerateGraphicsObjects(m_dynamicsWorld);
}
void DeformableContact::exitPhysics()
void DeformableMultibody::exitPhysics()
{
//cleanup in the reverse order of creation/initialization
@@ -274,14 +272,14 @@ void DeformableContact::exitPhysics()
delete m_collisionConfiguration;
}
void DeformableContact::stepSimulation(float deltaTime)
void DeformableMultibody::stepSimulation(float deltaTime)
{
// getDeformableDynamicsWorld()->getMultiBodyDynamicsWorld()->stepSimulation(deltaTime);
m_dynamicsWorld->stepSimulation(deltaTime, 5, 1./250.);
}
btMultiBody* DeformableContact::createFeatherstoneMultiBody_testMultiDof(btMultiBodyDynamicsWorld* pWorld, int numLinks, const btVector3& basePosition, const btVector3& baseHalfExtents, const btVector3& linkHalfExtents, bool spherical, bool floating)
btMultiBody* DeformableMultibody::createFeatherstoneMultiBody_testMultiDof(btMultiBodyDynamicsWorld* pWorld, int numLinks, const btVector3& basePosition, const btVector3& baseHalfExtents, const btVector3& linkHalfExtents, bool spherical, bool floating)
{
//init the base
btVector3 baseInertiaDiag(0.f, 0.f, 0.f);
@@ -341,7 +339,7 @@ btMultiBody* DeformableContact::createFeatherstoneMultiBody_testMultiDof(btMulti
return pMultiBody;
}
void DeformableContact::addColliders_testMultiDof(btMultiBody* pMultiBody, btMultiBodyDynamicsWorld* pWorld, const btVector3& baseHalfExtents, const btVector3& linkHalfExtents)
void DeformableMultibody::addColliders_testMultiDof(btMultiBody* pMultiBody, btMultiBodyDynamicsWorld* pWorld, const btVector3& baseHalfExtents, const btVector3& linkHalfExtents)
{
btAlignedObjectArray<btQuaternion> world_to_local;
world_to_local.resize(pMultiBody->getNumLinks() + 1);
@@ -403,9 +401,9 @@ void DeformableContact::addColliders_testMultiDof(btMultiBody* pMultiBody, btMul
pMultiBody->getLink(i).m_collider = col;
}
}
class CommonExampleInterface* DeformableContactCreateFunc(struct CommonExampleOptions& options)
class CommonExampleInterface* DeformableMultibodyCreateFunc(struct CommonExampleOptions& options)
{
return new DeformableContact(options.m_guiHelper);
return new DeformableMultibody(options.m_guiHelper);
}

View File

@@ -0,0 +1,19 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2016 Google Inc. http://bulletphysics.org
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 _DEFORMABLE_MULTIBODY_H
#define _DEFORMABLE_MULTIBODY_H
class CommonExampleInterface* DeformableMultibodyCreateFunc(struct CommonExampleOptions& options);
#endif //_DEFORMABLE_MULTIBODY_H

View File

@@ -1,17 +1,15 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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.
*/
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2016 Google Inc. http://bulletphysics.org
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.
*/
///create 125 (5x5x5) dynamic object
#define ARRAY_SIZE_X 5
@@ -27,7 +25,7 @@ subject to the following restrictions:
#define START_POS_Y -5
#define START_POS_Z -3
#include "DeformableDemo.h"
#include "DeformableRigid.h"
///btBulletDynamicsCommon.h is the main Bullet include file, contains most common include files.
#include "btBulletDynamicsCommon.h"
#include "BulletSoftBody/btDeformableRigidDynamicsWorld.h"
@@ -41,17 +39,17 @@ subject to the following restrictions:
#include "../CommonInterfaces/CommonRigidBodyBase.h"
#include "../Utils/b3ResourcePath.h"
///The DeformableDemo shows the use of rolling friction.
///The DeformableRigid shows the use of rolling friction.
///Spheres will come to a rest on a sloped plane using a constraint. Damping cannot achieve the same.
///Generally it is best to leave the rolling friction coefficient zero (or close to zero).
class DeformableDemo : public CommonRigidBodyBase
class DeformableRigid : public CommonRigidBodyBase
{
public:
DeformableDemo(struct GUIHelperInterface* helper)
DeformableRigid(struct GUIHelperInterface* helper)
: CommonRigidBodyBase(helper)
{
}
virtual ~DeformableDemo()
virtual ~DeformableRigid()
{
}
void initPhysics();
@@ -148,7 +146,7 @@ public:
}
};
void DeformableDemo::initPhysics()
void DeformableRigid::initPhysics()
{
m_guiHelper->setUpAxis(1);
@@ -246,7 +244,7 @@ void DeformableDemo::initPhysics()
m_guiHelper->autogenerateGraphicsObjects(m_dynamicsWorld);
}
void DeformableDemo::exitPhysics()
void DeformableRigid::exitPhysics()
{
//cleanup in the reverse order of creation/initialization
@@ -285,9 +283,9 @@ void DeformableDemo::exitPhysics()
class CommonExampleInterface* DeformableCreateFunc(struct CommonExampleOptions& options)
class CommonExampleInterface* DeformableRigidCreateFunc(struct CommonExampleOptions& options)
{
return new DeformableDemo(options.m_guiHelper);
return new DeformableRigid(options.m_guiHelper);
}

View File

@@ -0,0 +1,19 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2016 Google Inc. http://bulletphysics.org
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 _DEFORMABLE_RIGID_H
#define _DEFORMABLE_RIGID_H
class CommonExampleInterface* DeformableRigidCreateFunc(struct CommonExampleOptions& options);
#endif //_DEFORMABLE_RIGID_H

View File

@@ -1,17 +1,15 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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.
*/
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2016 Google Inc. http://bulletphysics.org
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.
*/
///create 125 (5x5x5) dynamic object
#define ARRAY_SIZE_X 5

View File

@@ -0,0 +1,19 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2016 Google Inc. http://bulletphysics.org
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 _PINCH_H
#define _PINCH_H
class CommonExampleInterface* PinchCreateFunc(struct CommonExampleOptions& options);
#endif //_PINCH_H

View File

@@ -1,17 +1,15 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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.
*/
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2016 Google Inc. http://bulletphysics.org
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.
*/
///create 125 (5x5x5) dynamic object
#define ARRAY_SIZE_X 5

View File

@@ -0,0 +1,19 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2016 Google Inc. http://bulletphysics.org
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 _VOLUMETRIC_DEFORMABLE_H
#define _VOLUMETRIC_DEFORMABLE_H
class CommonExampleInterface* VolumetricDeformableCreateFunc(struct CommonExampleOptions& options);
#endif //_VOLUMETRIC_DEFORMABLE__H

View File

@@ -359,14 +359,14 @@ SET(BulletExampleBrowser_SRCS
../MultiBody/MultiBodyConstraintFeedback.cpp
../SoftDemo/SoftDemo.cpp
../SoftDemo/SoftDemo.h
../Pinch/Pinch.cpp
../Pinch/Pinch.h
../DeformableContact/DeformableContact.cpp
../DeformableContact/DeformableContact.h
../DeformableDemo/DeformableDemo.cpp
../DeformableDemo/DeformableDemo.h
../VolumetricDeformable/VolumetricDeformable.cpp
../VolumetricDeformable/VolumetricDeformable.h
../DeformableDemo/Pinch.cpp
../DeformableDemo/Pinch.h
../DeformableDemo/DeformableMultibody.cpp
../DeformableDemo/DeformableMultibody.h
../DeformableDemo/DeformableRigid.cpp
../DeformableDemo/DeformableRigid.h
../DeformableDemo/VolumetricDeformable.cpp
../DeformableDemo/VolumetricDeformable.h
../MultiBody/MultiDofDemo.cpp
../MultiBody/MultiDofDemo.h
../RigidBody/RigidBodySoftContact.cpp

View File

@@ -47,11 +47,10 @@
#include "../FractureDemo/FractureDemo.h"
#include "../DynamicControlDemo/MotorDemo.h"
#include "../RollingFrictionDemo/RollingFrictionDemo.h"
#include "../DeformableDemo/DeformableDemo.h"
#include "../Pinch/Pinch.h"
#include "../DeformableContact/DeformableContact.h"
#include "../MultiBodyBaseline/MultiBodyBaseline.h"
#include "../VolumetricDeformable/VolumetricDeformable.h"
#include "../DeformableDemo/DeformableRigid.h"
#include "../DeformableDemo/Pinch.h"
#include "../DeformableDemo/DeformableMultibody.h"
#include "../DeformableDemo/VolumetricDeformable.h"
#include "../SharedMemory/PhysicsServerExampleBullet2.h"
#include "../SharedMemory/PhysicsServerExample.h"
#include "../SharedMemory/PhysicsClientExample.h"
@@ -196,10 +195,10 @@ static ExampleEntry gDefaultExamples[] =
//ExampleEntry(1, "Spheres & Plane C-API (Bullet3)", "Collision C-API using Bullet 3.x backend", CollisionTutorialBullet2CreateFunc,TUT_SPHERE_PLANE_RTB3),
ExampleEntry(0, "Deformabe Body"),
ExampleEntry(1, "Deformable-RigidBody Contact", "Deformable test", DeformableCreateFunc),
ExampleEntry(1, "Deformable-RigidBody Contact", "Deformable test", DeformableRigidCreateFunc),
ExampleEntry(1, "Grasp Deformable Cube", "Grasping test", PinchCreateFunc),
ExampleEntry(1, "Volumetric Deformable Objects", "Volumetric Deformable test", VolumetricDeformableCreateFunc),
ExampleEntry(1, "Deformable-MultiBody Contact", "MultiBody and Deformable contact", DeformableContactCreateFunc),
ExampleEntry(1, "Deformable-MultiBody Contact", "MultiBody and Deformable contact", DeformableMultibodyCreateFunc),
// ExampleEntry(1, "MultiBody Baseline", "MultiBody Baseline", MultiBodyBaselineCreateFunc),
#ifdef INCLUDE_CLOTH_DEMOS

View File

@@ -189,9 +189,6 @@ project "App_BulletExampleBrowser"
"../VoronoiFracture/*",
"../SoftDemo/*",
"../DeformableDemo/*",
"../DeformableContact/*",
"../VolumetricDeformable/*",
"../Pinch/*",
"../RollingFrictionDemo/*",
"../rbdl/*",
"../FractureDemo/*",

View File

@@ -1,20 +0,0 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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 _PINCH_H
#define _PINCH_H
class CommonExampleInterface* PinchCreateFunc(struct CommonExampleOptions& options);
#endif //_PINCH_H

View File

@@ -1,20 +0,0 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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 _VOLUMETRIC_DEFORMABLE_H
#define _VOLUMETRIC_DEFORMABLE_H
class CommonExampleInterface* VolumetricDeformableCreateFunc(struct CommonExampleOptions& options);
#endif //_VOLUMETRIC_DEFORMABLE__H

View File

@@ -1,13 +1,11 @@
/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
Copyright (c) 2016 Google Inc. http://bulletphysics.org
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.