从向量中得到xyz

下面是一个帮助控制汽车的函数，它创建一个矩阵，然后使用该矩阵创建一个向量，现在我希望能够从该向量中获得x、y和z。我试过i32 CarX = vecVel.GetX;，但出现了这三个错误

error C3867: 'Vec2::GetX': function call missing argument list; use '&Vec2::GetX' to create a pointer to member
error C2440: '=' : cannot convert from 'const float (__thiscall Vec2::* )(void) const' to 'i32'
IntelliSense: a pointer to a bound function may only be used to call the function

我认为i32 carX = vecVel[0];可能工作，但没有。i32 carX = vecVel.FX;不工作，因为它说FX是受保护的

void APIENTRY Car_Update(Object *pObject)
{
    Car *pCar=(Car *)pObject;
    Matrix mat;
    Matrix *pmat;
    Object_GetMatrix(pObject,&mat);
    Object_GetMatrixPtr(pObject,&pmat);
    Vec3 vecVel(pCar->vecBounce + mat.GetColumn(2) * pCar->fSpeed);
    pCar->vecBounce = pCar->vecBounce *0.5f;
    mat.RotY(pCar->fRot);
    mat.SetColumn(3, vecVel + mat.GetColumn(3));
    //mat.GetColumn;
    pCar->fSpeed *= 0.8f;// friction
    pCar->fRotWheelLast = pCar->fRotWheel;
    pCar->fRotWheel += (pCar->fSpeed*30.f);
    Level_GenerateDraw( &mat.GetColumn(3) );
    Level_GenerateAlphas( &mat.GetColumn(3) );
    Car_Light(pCar);
    Collision_UpdateMat(pCar->pBox, &mat);
    float fCol=1.f;
    while(Level_TestBoxCollide( pCar->pBox ))
    {
        ColData Data;
        float fDot;
        Collision_GetColData(&Data);    
        fDot = -1.8f * Data.normal.Dot(vecVel);
        pCar->vecBounce = (vecVel + Data.normal * fDot)*fCol;
        pCar->fSpeed = 0.f;
        mat.SetColumn(3, pmat->GetColumn(3) + pCar->vecBounce);
        Collision_UpdateMat(pCar->pBox, &mat);
        vecVel = pCar->vecBounce;
        fCol-=0.1f;
        if(fCol<0.f)
        {
            pCar->vecBounce.Set(0.f,0.f,0.f);
            mat.SetColumn(3, pmat->GetColumn(3));
            Collision_UpdateMat(pCar->pBox, &mat);
            ASSERT(!Level_TestBoxCollide( pCar->pBox ), "still colliding");
        }
    }
    Object_SetMatrix(pObject, &mat);
    Vec3 vecWidth(mat.GetColumn(0)*0.2f);
    Vec3 vecWheel1(mat.GetColumn(3) - mat.GetColumn(0)*0.6f);
    Vec3 vecWheel2(mat.GetColumn(3) + mat.GetColumn(0)*0.6f);
    vecWheel1.SetY( vecWheel1.GetY() - 0.7f );
    vecWheel2.SetY( vecWheel2.GetY() - 0.7f );
    Trail_AddPoint((Object*)pCar->pTrail[0], vecWheel1, vecWidth);
    Trail_AddPoint((Object*)pCar->pTrail[1], vecWheel2, vecWidth);
}