子弹物理盒不旋转答案

【问题标题】：Bullet physics boxes don't rotate子弹物理盒不旋转
【发布时间】：2014-06-29 19:08:28
【问题描述】：

我正在使用以下代码使用子弹物理引擎设置一个简单的世界。当我运行它时，盒子的行为并不真实，因为它们不旋转。就像他们的旋转被锁定了一样。有没有人以前见过这样的事情或知道可能是什么原因造成的？谢谢。

World::World()
{
mBroadphase = new btDbvtBroadphase();
mCollisionConfiguration = new btDefaultCollisionConfiguration();
mDispatcher = new btCollisionDispatcher(mCollisionConfiguration);
mSolver = new btSequentialImpulseConstraintSolver();
mWorld = new btDiscreteDynamicsWorld(mDispatcher, mBroadphase, mSolver, mCollisionConfiguration);
mWorld->setGravity(btVector3(0, -10, 0));

mGroundShape = new btStaticPlaneShape(btVector3(0, 1, 0), 1);
mBoxShape = new btBoxShape(btVector3(4, 1.5, 1));

mGroundMotionState = new btDefaultMotionState(btTransform(btQuaternion(0, 0, 0, 1), btVector3(0, -10, 0)));
btRigidBody::btRigidBodyConstructionInfo groundRBCI(0, mGroundMotionState, mGroundShape, btVector3(0, 0, 0));

mGroundRigidBody = new btRigidBody(groundRBCI);
mGroundRigidBody->setUserIndex(1);
mWorld->addRigidBody(mGroundRigidBody);

btScalar mass = 1;
btVector3 boxInertia(0, 0, 0);
mBoxShape->calculateLocalInertia(mass, boxInertia);

mBoxMotionState1 = new btDefaultMotionState(btTransform(btQuaternion(0, 0, 0, 1), btVector3(0, 35, -20)));
btRigidBody::btRigidBodyConstructionInfo BoxRBCI1(mass, mBoxMotionState1, mBoxShape, btVector3(0, 0, 0));
mBoxRigidBody1 = new btRigidBody(BoxRBCI1);
mBoxRigidBody1->setUserIndex(2);

mBoxMotionState2 = new btDefaultMotionState(btTransform(btQuaternion(0, 0, 0, 1), btVector3(2, 20, -20)));
btRigidBody::btRigidBodyConstructionInfo BoxRBCI2(mass, mBoxMotionState2, mBoxShape, btVector3(0, 0, 0));
mBoxRigidBody2 = new btRigidBody(BoxRBCI2);
mBoxRigidBody2->setUserIndex(3);

mBoxMotionState3 = new btDefaultMotionState(btTransform(btQuaternion(0, 0, 0, 1), btVector3(-5, 12, -20)));
btRigidBody::btRigidBodyConstructionInfo BoxRBCI3(mass, mBoxMotionState3, mBoxShape, btVector3(0, 0, 0));
mBoxRigidBody3 = new btRigidBody(BoxRBCI3);
mBoxRigidBody3->setUserIndex(4);

mWorld->addRigidBody(mBoxRigidBody1);
mWorld->addRigidBody(mBoxRigidBody2);
mWorld->addRigidBody(mBoxRigidBody3);



}

【问题讨论】：

标签： c++ opengl physics bullet

【解决方案1】：

啊哈！我遇到了这个问题，但很长时间都找不到答案，所以我很乐意提供帮助！

线

mBoxShape->calculateLocalInertia(mass, boxInertia);

修改boxInertia，然后您需要将其传递给btRigidBody::btRigidBodyConstructionInfo 的构造函数，如下所示：

btRigidBody::btRigidBodyConstructionInfo BoxRBCI1(mass, mBoxMotionState1, mBoxShape, boxInertia);

然后你的盒子应该旋转:)

【讨论】：