旋转一个对象面对另一个C

Rotating one object to face another C++

本文关键字：另一个 面对 一个对象 旋转      更新时间：2023-10-16

我正在尝试旋转一个对象（汽车）以面对一个对象，但是我对此有很多困难。

我在此代码方面取得了不同的成功，它知道角度何时正确，并且何时会面对正确的方式，但大多数情况下它会由于符号值而迅速陷入困境1> -1或从-1> 1每个框架，从而导致所有旋转停止，并使汽车不受控制地抽搐，从不真正纠正自己。

老实说，我不确定我的符号计算是否在使用X/Z轴上移动时使用正确的值，但在Y轴上旋转以向左/右转

我正在使用c 和directx11

任何建议/帮助将不胜感激，谢谢！

bool ParticleModel::FaceTarget(XMFLOAT3 target)
{
XMFLOAT3 toNormalize;
toNormalize.x = transform->GetPosition().x - target.x;
toNormalize.y = transform->GetPosition().y - target.y;
toNormalize.z = transform->GetPosition().z - target.z;
XMFLOAT3 toTarget = NormalizeVector(toNormalize);
//Determine the angle between the heading vector and the target.
XMFLOAT3 carHeading;
carHeading.x = sin(transform->GetRotation().y);
carHeading.y = sin(transform->GetRotation().x);
carHeading.z = cos(transform->GetRotation().y);
carHeading = NormalizeVector(carHeading);
double angle = acos(DotProduct(carHeading, toTarget));

//Return true if the player is facing the target.
if (angle < 0.01000)
{
    return true;
}
/*if (signTimer < signCooldown)
{
    signTimer++;
}
else if (signTimer >= signCooldown)
{
    signTimer = 0;
    sign = GetSign(carHeading, toTarget);
}*/
sign = GetSign(carHeading, toTarget);
transform->SetYRot(transform->GetRotation().y + (0.030f*sign));
//bool thing = false;
//RotateHeadingByRadian(angle, mHeading.Sign(toTarget));

return true;
}
float ParticleModel::DotProduct(XMFLOAT3 a, XMFLOAT3 b)
{
    float dot;
    dot = (a.x * b.x) + (a.y * b.y) + (a.z * b.z);
    return dot;
}
int ParticleModel::GetSign(XMFLOAT3 v1, XMFLOAT3 v2)
{
    if (v1.y*v2.z > v1.z*v2.y)
    {
        return -1;
    }
    else
    {
    return 1;
    }
}

没关系，我发现了如何做，从本质上讲，这是代码

XMFLOAT3 distance;
distance.x = transform->GetPosition().x - target.x;
distance.y = transform->GetPosition().y - target.y;
distance.z = transform->GetPosition().z - target.z;
XMFLOAT3 carHeading;
carHeading.x = sin(transform->GetRotation().y);
carHeading.y = sin(transform->GetRotation().x);
carHeading.z = cos(transform->GetRotation().y);
if (VectorLength(distance) < 0.5)
{
    return true;
}
//Don't actually need to call normalize for directionA - just doing it to indicate
//that this vector must be normalized.
XMFLOAT3 directionA = carHeading;
XMFLOAT3 directionB = NormalizeVector(distance);
float rotationAngle = (float)acos(DotProduct(directionA, directionB));
if (abs(rotationAngle) < 0.5)
{
    return true;
}
XMFLOAT3 rotationAxis = CrossProduct(directionA, directionB);
rotationAxis = NormalizeVector(rotationAxis);
transform->SetYRot(transform->GetRotation().y + (rotationAngle*rotationAxis.y));
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