Raycast或时间或滞后？(Raycast or timing or lag?)

 所以我正在从教程中对一个raycast物理处理程序进行测试。 我正在从每个模拟的相同高度下降一个块，目标是使块以平滑的方式落在平坦表面的顶部。 目前，我的光线投影通过皮肤宽度从盒子的底部突出，raylength缩小了velocity.y如下所示： 
 
rayOrigin += Vector2.right * (verticalRaySpacing * i + velocity.x);
//Sends out the ray at its respective spot an length

RaycastHit2D hit = Physics2D.Raycast(rayOrigin, Vector2.up * directionY, rayLength, collisionMask);
Debug.DrawRay(rayOrigin, Vector2.up * directionY * rayLength, Color.red);

//If the ray hits, make velocity = distance to the hit distance - skin width
//Also reset the rayLength for edge height discrepencies
if (hit)
{
    //Reports the very first hit.distance and velocity.y at the first hit
    if (!temp && hit.distance != 0)
    {
        Debug.Log(hit.distance);
        Debug.Log(velocity.y);
        temp = true;
    }

    velocity.y = (hit.distance - skinWidth) * directionY;
    rayLength = hit.distance;
}
 
 我的问题是，当我反复运行这个模拟时，大约有一半的时间，当块与平面碰撞时，它会在表面上方产生这个初始的“停止力”，然后块上的重力重新启动并拉动它直接在表面上。 
 
 所以基本上，有时候它会在比其他时间更高的距离感应到碰撞，从而迫使它在太空中停止半空。 我已经通过观察hit.distance和velocity.y上的hit.distance映射了这一点。 这种不利影响发生的时间， hit.distance距离大于0.1 ， velocity.y hit.distance大约是-9.56 ，而hit.distance距离有利的hit.distance在0.1以下， velocity.y -9.67是-9.67 。 
 
 当我根本不改变系统时，什么导致模拟高度和数字的差异？ 是编辑中的滞后还是需要考虑的事情？ 它会出现在移动应用程序上吗？ 
 
 谢谢你的帮助。 

So i'm running a test on a raycast physics handler from a tutorial. I am dropping a block from the same height each simulation with the goal to have the block land on top of a flat surface in one smooth motion. Currently, I have raycasts projecting out of the bottom of the box through a skin width with the raylength scaling off the velocity.y as seen below: 
 
rayOrigin += Vector2.right * (verticalRaySpacing * i + velocity.x);
//Sends out the ray at its respective spot an length

RaycastHit2D hit = Physics2D.Raycast(rayOrigin, Vector2.up * directionY, rayLength, collisionMask);
Debug.DrawRay(rayOrigin, Vector2.up * directionY * rayLength, Color.red);

//If the ray hits, make velocity = distance to the hit distance - skin width
//Also reset the rayLength for edge height discrepencies
if (hit)
{
    //Reports the very first hit.distance and velocity.y at the first hit
    if (!temp && hit.distance != 0)
    {
        Debug.Log(hit.distance);
        Debug.Log(velocity.y);
        temp = true;
    }

    velocity.y = (hit.distance - skinWidth) * directionY;
    rayLength = hit.distance;
}
 
My problem is that when i run this simulation over and over, about half the time when the block collides with the flat surface it produces this initial "stopping force" a bit above the surface, and then the gravity on the block restarts and pulls it directly onto the surface. 
 
So basically, sometimes it is sensing a collision at higher distances than other times forcing it to stop mid-air too early. I have mapped this out by watching the Debug.Log on the hit.distance and velocity.y. The times where this unfavorable effect happens, the hit.distance is above 0.1 and the velocity.y is about -9.56, while the times that are favorable the hit.distance is somewhere below 0.1 and the velocity.y is -9.67. 
 
What is causing this difference in the simulation heights and numbers when i am not changing the system at all? Is it lag in the editor or something that needs to be accounted for? Will it show up on a mobile App?
 
Thanks for your help.

原文：https://stackoverflow.com/questions/47257205