在透视模式下绘制调试射线

Question

我已经成功地使用正交相机投射和绘制调试光线，但我将其更改为透视并且我的 none 光线似乎不再起作用（在场景视图中，我的调试光线不起作用用我的鼠标移动）。

这是我的正交代码，我需要做哪些不同的透视？

public class Cursor : MonoBehaviour {

// 45 degree angle down, same as camera angle
private Vector3 gameAngle = new Vector3(0, -45, -45);
public RaycastHit hit;
public Ray ray;

void Update() {
    // Rays
    ray = new Ray(Camera.main.ScreenToWorldPoint(Input.mousePosition), gameAngle);
    if (Debug.isDebugBuild)
        Debug.DrawRay(Camera.main.ScreenToWorldPoint(Input.mousePosition), gameAngle * 20, Color.green);    
}

}

Answer 1

你试过换视角吗？我假设你开启了 2d 模式。

Answer 2

我想直接从文档中得到答案 http://docs.unity3d.com/ScriptReference/Camera.ScreenPointToRay.html

Ray ray = camera.ScreenPointToRay(Input.mousePosition);
Debug.DrawRay(ray.origin, ray.direction * 10, Color.yellow);

Answer 3

首先我们需要知道 DrawRay 函数期望的参数是什么

它想要光线的原点，方向和距离（你也可以给它一个颜色，和其他参数）。

public static void DrawRay(Vector3 start, Vector3 dir, Color color = Color.white, float duration = 0.0f, bool depthTest = true);

所以现在我们需要知道光线原点和 ray.point 位置之间的方向，为了找到我们可以使用减法...

If one point in space is subtracted from another, then the result is a vector that “points” from one object to the other:

// Gets a vector that points from the player's position to the target's.
var heading = hit.point - ray.origin;

现在有了这个信息，我们可以得到光线的方向和距离

var distance = heading.magnitude;
var direction = heading / distance; // This is now the normalized direction.

这将是生成的代码...

Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;

if (Physics.Raycast(ray, out hit))
{
   // Gets a vector that points from the player's position to the target's.
   var heading = hit.point - ray.origin;
   var distance = heading.magnitude;
   var direction = heading / distance; // This is now the normalized direction.

   Debug.DrawRay(ray.origin, direction * distance, Color.red);

 }

https://docs.unity3d.com/Manual/DirectionDistanceFromOneObjectToAnother.html https://docs.unity3d.com/ScriptReference/Debug.DrawRay.html

在透视模式下绘制调试射线

Draw debug ray in perspective mode

c#

unity3d

raytracing