太阳系模拟器物理整合问题(虚幻引擎4,C ++)

所以我在虚幻引擎4中使用C ++为大学项目制作了这个太阳系模拟器,然而,我是C ++和UE4的新手,我吸取了数学知识,所以我需要一些帮助,我想用欧拉积分器现在只是为了获得一些基本的物理学,并在地球上有月球轨道,然后继续使用Velocity Verlet方法并以这种方式构建整个太阳系。 但是,就目前而言,即使欧拉整合也不起作用。 这是Moon.cpp中的代码

//Declare the masses
float MMass = 109.456;
float EMass = 1845.833;

//New velocities
float NewMVelX = 0.0;
float NewMVelY = 0.0;
float NewMVelZ = 0.0;

//Distance
float DistanceX = 0.0;
float DistanceY = 0.0;
float DistanceZ = 0.0;

//Earth's velocity
float EVelocityX = 0.0;
float EVelocityY = 0.0;
float EVelocityZ = 0.0;

//Moon's base velocity
float MVelocityX = 0.1;
float MVelocityY = 0.0;
float MVelocityZ = 0.0;

//Moon's acceleration
float MForceX = 0.0;
float MForceY = 0.0;
float MForceZ = 0.0;

//New position
float MPositionX = 0.0;
float MPositionY = 0.0;
float MPositionZ = 0.0;

// Called every frame
void AMoon::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

    //Get Earth Location
    FVector EPosition = FVector(0.0, 0.0, 0.0);

    //Get Moon Location
    FVector MPosition = GetActorLocation();

    //Get the distance between the 2 bodies
    DistanceX = (MPosition.X - EPosition.X) / 100;
    DistanceY = (MPosition.Y - EPosition.Y) / 100;
    //DistanceZ = MPosition.Z - EPosition.Z / 100; 


    //Get the acceleration/force for every axis
    MForceX = G * MMass * EMass / (DistanceX * DistanceX);
    MForceY = G * MMass * EMass / (DistanceY * DistanceY);
    //MForceZ = G * MMass * EMass / (DistanceZ * DistanceZ);


    //Get the new velocity
    NewMVelX = MVelocityX + MForceX;
    NewMVelY = MVelocityY + MForceY;
    //NewMVelZ = MVelocityZ + MForceZ * DeltaTime;

    //Get the new location
    MPositionX = (MPosition.X) + NewMVelX;
    MPositionY = (MPosition.Y) + NewMVelY;
    //MPositionZ = MPosition.Z * (MVelocityZ + NewMVelZ) * 0.5 * DeltaTime;

    //Set the new velocity on the old one
    MVelocityX = NewMVelX;
    MVelocityY = NewMVelY;
    //MVelocityZ = NewMVelZ;

    //Assign the new location
    FVector NewMPosition = FVector(MPositionX, MPositionY, MPositionZ);

    //Set the new location
    SetActorLocation(NewMPosition);

}

这些值可能不对,我只是在这一点上进行测试。 我将这些代码基于我在Google和多个网站上获得的不同信息,但此时我很困惑。 正在发生的事情是,月球刚刚开始朝着一个方向前进,永不停歇。 我知道我的问题是地球的力量/加速度/实际重力,它应该拉动月球不会推开它。 但无论如何,如果有人知道我做错了什么,我会非常感谢你听到你说的话! 谢谢


力依赖于欧几里德旋转不变距离。 因此使用

distance = sqrt(distanceX²+distanceY²+distanceZ²)

force = - G*Emass*Mmass/distance²

forceX = force * X/distance
forceY = force * Y/distance
forceZ = force * Z/distance

速度的时间跨度也是错误的,应该是

velocityX += forceX/Mmass * deltaTime
velocityY += forceY/Mmass * deltaTime
velocityZ += forceZ/Mmass * deltaTime

当然,位置更新也包含时间步骤

positionX += velocityX * deltaTime
....
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