在Unity 3D中，如何均匀分布对象以填充曲线空间是最佳方法？

Question

在Unity 3D中，如何均匀分布对象以填充曲线空间是最佳方法？

5

我希望在编辑器中用椅子填充这个观众席，并使它们都面向同一个焦点（舞台）。然后，我将随机地用不同的人来填充这些椅子（在运行时）。每次运行后，椅子应保持不变，但人员应该被清除，以便在下一次运行时，人群看起来不同。

当前，座位区域、椅子和人员均未附加碰撞器。

我找到了这段代码，它已经处理好了旋转椅子以便它们对准同一个焦点的问题。但我仍然想知道是否有更好的方法来实现这个目标。

//C# Example (LookAtPoint.cs)
using UnityEngine;
[ExecuteInEditMode]
public class LookAtPoint : MonoBehaviour
{
    public Vector3 lookAtPoint = Vector3.zero;

    void Update()
    {
        transform.LookAt(lookAtPoint);
    }
}

额外的截图

- johnny117

1个回答

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- zwcloud · Accepted Answer

你可以编写编辑器脚本来自动地将它们均匀地放置。在这个脚本中，

以下代码中我没有处理世界空间和局部/模型空间。需要时请记得处理。

Generate parallel rays that come from +y to -y in a grid. The patch size of this grid depends on how big you chair and the mesh(curved space) is. To get a proper patch size. Get the bounding box of a chair(A) and the curved space mesh(B), and then devide them(B/A) and use the result as the patch size.

Mesh chairMR;//Mesh of the chair
Mesh audiMR;//Mesh of the auditorium
var patchSizeX = audiMR.bounds.size.X;
var patchSizeZ = audiMR.bounds.size.Z;
var countX = audiMR.bounds.size.x / chairMR.bounds.size.x;
var countZ = audiMR.bounds.size.z / chairMR.bounds.size.z;

So the number of rays you need to generate is about countX*countZ. Patch size is (patchSizeX, patchSizeZ).

Then, origin points of the rays can be determined:

//Generate parallel rays that come form +y to -y.
List<Ray> rays = new List<Ray>(countX*countZ);
for(var i=0; i<countX; ++i)
{
    var x = audiMR.bounds.min.x + i * sizeX + tolerance /*add some tolerance so the placed chairs not intersect each other when rotate them towards the stage*/;
    for(var i=0; i<countZ; ++i)
    {
        var z = audiMR.bounds.min.z + i * sizeZ + tolerance;
        var ray = new Ray(new Vector3(x, 10000, z), Vector3.down);
        //You can also call `Physics.Raycast` here too.
    }
}

Get postions to place chairs.
1. attach a MeshCollider to your mesh temporarily
2. foreach ray, Physics.Raycast it (you can place some obstacles on places that will not have a chair placed. Set special layer for those obstacles.)
3. get hit point and create a chair at the hit point and rotate it towards the stage
Reuse these hit points to place your people at runtime.

Convert each of them into a model/local space point. And save them into json or asset via serialization for later use at runtime: place people randomly.