线上站就在Vector3前

Question

我试着做一个直线，但它太精确了，所以它不是我想要的工作方式。

我似乎不知道如何执行从point A转换而来的行，并阻止0.001f远离点B (Point A意为camera.transform.position，以及point B意为代码片段中的handle )。

foreach(Vector3 handle in handles){
    if(!Physics.Linecast(camera.transform.position, handle)){
        Handles.FreeMoveHandle(handle, Quaternion.identity, 0.001f, Vector3.zero, Handles.DotCap);
    }
}

那么，从相机到重点，我如何才能让Linecast停下来呢？

编辑

前视镜

在前面的视图中，并不是所有的句柄都显示：

​

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后视镜

在后面的视图中，几乎所有的句柄都在那里：

​

​

全码

CreatureCreatorEditor.cs

using UnityEngine;
using UnityEditor;
using System.Collections;
using System.Collections.Generic;
using Creature;

[CustomEditor(typeof(Creator))]
public class CreatureCreatorEditor : Editor {
    
    HashSet<Vector3> handles = new HashSet<Vector3>();

    void OnEnable(){
        Creator t = (Creator)target;
        Mesh mesh = t.GetComponent<MeshFilter>().sharedMesh;
        if (mesh != null) {
            Vector3[] vertices = mesh.vertices;
            Vector3 lp = t.transform.position;
            foreach (Vector3 v in vertices) {
                Vector3 p = (lp - v);
                handles.Add(new Vector3 (p.x, -p.z, p.y));
            }
        }
    }

    public void OnSceneGUI(){
        Handles.color = Color.red;
        Camera camera = Camera.current;
        foreach(Vector3 handle in handles){
            Vector3 point = camera.WorldToViewportPoint(handle);
            if(point.x > 0 && point.x < 1 && point.y > 0 && point.y < 1){
//              float dist = Vector3.Distance(camera.transform.position, handle);
//              Vector3 fwd = camera.transform.TransformDirection(handle);
                Vector3 newBPos = new Vector3(handle.x - 0.001f, handle.y - 0.001f, handle.z - 0.001f);
                if(!Physics.Linecast(camera.transform.position, newBPos)){
                    Handles.FreeMoveHandle(handle, Quaternion.identity, 0.001f, Vector3.zero, Handles.DotCap);
                }
            }
        }
    }

    public override void OnInspectorGUI(){

    }
}

Creator.cs

using UnityEngine;
using UnityEditor;
using System.Collections;

namespace Creature{
    [RequireComponent(typeof(MeshFilter))]
    [RequireComponent(typeof(MeshCollider))]
    public class Creator : MonoBehaviour {

    }
}

Answer 1

我喜欢它的工作原理，我只需要让Y轴正常工作。

public void OnSceneGUI(){
    Camera camera = Camera.current;
    Handles.color = Color.red;
    Vector3 mp = Event.current.mousePosition;
    Ray ray = camera.ScreenPointToRay(mp);
    RaycastHit hit;
    if(Physics.Raycast(ray, out hit)){
        Vector3 pos = hit.point;
        foreach(Vector3 handle in handles){
            if(Vector3.Distance(handle, pos) <= 0.05f){
                Handles.FreeMoveHandle(handle, Quaternion.identity, 0.001f, Vector3.zero, Handles.DotCap);
            }
        }
    }
}

Answer 2

你需要一个补偿。你应该从B位置减去0.001f。

这将对x，y，z位置起作用。

const float newPosOffset = 0.001f;

    foreach(Vector3 handle in handles){
    Vector3 newBPos = new Vector3(handle.x-newPosOffset ,handle.y-newPosOffset ,handle.z-newPosOffset );
        if(!Physics.Linecast(camera.transform.position, newBPos)){
            Handles.FreeMoveHandle(handle, Quaternion.identity, 0.001f, Vector3.zero, Handles.DotCap);
        }
    }