Box2d 碰撞脉冲

发布于 2024-12-21 21:31:09 字数 837 浏览 0 评论 0原文

我想使用碰撞的冲量来计算碰撞中每个物体所造成的损坏。到目前为止，我有以下内容：

void FMContactListener::PostSolve(b2Contact* contact, const b2ContactImpulse* impulse) {

    // Can be up to 2 for polygon collision
    int count = contact->GetManifold()->pointCount;

    // My two sprites in the collision
    CCSprite *spriteA = (CCSprite*)contact->GetFixtureA()->GetBody()->GetUserData();
    CCSprite *spriteB = (CCSprite*)contact->GetFixtureB()->GetBody()->GetUserData();

    for (int i = 0; i < count; ++i) {
        b2ManifoldPoint point = contact->GetManifold()->points[i];
        // This is the impulse at this point
        float impulse = point.normalImpulse;
    }
}

这给了我每次调用 PostSolve 碰撞中每个点时的冲动。

我不是物理系的学生，但是每个物体不是都有自己的冲量作为其动量随 box2d 步骤的时间变化（例如 1/60 秒）吗？如果我从两个物体的碰撞中得到一个脉冲，这意味着什么？

原文

I would like to use the impulse of a collision in order to calculate the damage each object in the collision undertakes. So far I have the following:

void FMContactListener::PostSolve(b2Contact* contact, const b2ContactImpulse* impulse) {

    // Can be up to 2 for polygon collision
    int count = contact->GetManifold()->pointCount;

    // My two sprites in the collision
    CCSprite *spriteA = (CCSprite*)contact->GetFixtureA()->GetBody()->GetUserData();
    CCSprite *spriteB = (CCSprite*)contact->GetFixtureB()->GetBody()->GetUserData();

    for (int i = 0; i < count; ++i) {
        b2ManifoldPoint point = contact->GetManifold()->points[i];
        // This is the impulse at this point
        float impulse = point.normalImpulse;
    }
}

This gives me the impulse at each call to PostSolve for each point in the collision.

I'm no physics student, but doesn't each object have their own impulse as the change in its momentum over the time of the box2d step (say 1/60th of a second)? If I'm getting a single impulse from the collision of two objects, what does this imply?

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