Unity Raycast() 和 DrawRay() 使用相同的输入创建不同的光线

Question

我正在尝试创建一条弯曲射线，并且需要列出弯曲射线命中的对象。我可以用 Debug.DrawRay() 绘制弯曲的射线。然而，当我为 Raycast() 提供与 DrawRay() 相同的参数时，它会创建非常不同的射线（我猜是因为我看不到射线）。 Raycast() 的光线击中我在图像中突出显示的对象。但是 DrawRay() 的 Ray 距离太远，无法击中高亮的物体。我怎样才能让它们创建相同的光线？

//Here is the code:

public void CurveCast(Vector3 origin, Vector3 direction, Vector3 gravityDirection, int smoothness, float maxDistance, float direction_multiply, float radius)
{
    Vector3 currPos = origin, hypoPos = origin, hypoVel = (direction.normalized / smoothness) * direction_multiply;
    List<Vector3> v = new List<Vector3>();        
    float curveCastLength = 0;

    Ray ray;
    RaycastHit hit;
    hit_list = new List<RaycastHit>();
    while (curveCastLength < maxDistance)
    {
        ray = new Ray(currPos, hypoVel);

        Debug.DrawRay(currPos, hypoVel, Color.white);
        if (Physics.Raycast(currPos, hypoVel, out hit)) // if (Physics.SphereCast(ray, radius, out hit,maxDistance))
        {
            hit_list.Add(hit);
        }


        v.Add(hypoPos);
        currPos = hypoPos;
        hypoPos = currPos + hypoVel + (gravityDirection * Time.fixedDeltaTime / (smoothness * smoothness));
        hypoVel = hypoPos - currPos;
        curveCastLength += hypoVel.magnitude;
    }
}

Answer 1

因为Debug.DrawRay和Physics.Raycast不完全一样

在Debug.DrawRay中，射线的长度由向量大小定义。你可以 see it in the doc:

Draws a line from start to start + dir in world coordinates.

对于Physics.Raycast，射线的长度与方向无关，可以设置为参数。它的默认值是无穷大，所以如果你不定义它，即使方向向量很短，光线投射也会趋于无穷大。 See the doc:

Casts a ray, from point origin, in direction direction, of length maxDistance, against all colliders in the scene.

因此，您的解决方案是为 Raycast 函数提供适当的距离：

Debug.DrawRay(currPos, hypoVel, Color.white);
if (Physics.Raycast(currPos, hypoVel, out hit, hypoVel.magnitude())) // if (Physics.SphereCast(ray, radius, out hit,maxDistance))
{
    hit_list.Add(hit);
}

Unity Raycast() 和 DrawRay() 使用相同的输入创建不同的光线

Unity Raycast() and DrawRay() creates different Rays using same inputs

c#

unity3d

raycasting