├── ConvexHull ├── ConvexHull.cs ├── ConvexHull.cs.meta ├── ConvexHull.prefab ├── ConvexHull.prefab.meta ├── ConvexHullTest.cs ├── ConvexHullTest.cs.meta ├── TestScene.unity └── TestScene.unity.meta ├── Preview.gif └── README.md /ConvexHull/ConvexHull.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections; 3 | using System.Collections.Generic; 4 | using UnityEngine; 5 | 6 | namespace Hont 7 | { 8 | public class ConvexHull : MonoBehaviour 9 | { 10 | public Transform[] pointsArray; 11 | public float height = 4; 12 | 13 | 14 | public bool IsInRange(Vector3 comparePoint) 15 | { 16 | comparePoint = transform.worldToLocalMatrix.MultiplyPoint3x4(comparePoint); 17 | 18 | var flag = true; 19 | flag &= comparePoint.y <= height; 20 | flag &= comparePoint.y >= -height; 21 | flag &= IsConcaveContain2D(pointsArray, comparePoint); 22 | 23 | if (flag) 24 | return true; 25 | 26 | return false; 27 | } 28 | 29 | bool IsConcaveContain2D(Transform[] points, Vector3 compare) 30 | { 31 | const float VIRTUAL_RAYCAST_LEN = 100000; 32 | 33 | var comparePoint = (points[1].localPosition + points[0].localPosition) * 0.5f; 34 | var originPoint = compare; 35 | comparePoint += (comparePoint - originPoint).normalized * VIRTUAL_RAYCAST_LEN; 36 | 37 | int count = 0; 38 | for (int i = 0; i < points.Length; i++) 39 | { 40 | var a = points[i % points.Length]; 41 | var b = points[(i + 1) % points.Length]; 42 | 43 | var r = IsLineSegmentIntersection(a.localPosition, b.localPosition, originPoint, comparePoint); 44 | 45 | if (r) count++; 46 | } 47 | 48 | return count % 2 == 1; 49 | } 50 | 51 | bool IsLineSegmentIntersection(Vector3 a, Vector3 b, Vector3 c, Vector3 d) 52 | { 53 | var crossA = Mathf.Sign(Vector3.Cross(d - c, a - c).y); 54 | var crossB = Mathf.Sign(Vector3.Cross(d - c, b - c).y); 55 | 56 | if (Mathf.Approximately(crossA, crossB)) return false; 57 | 58 | var crossC = Mathf.Sign(Vector3.Cross(b - a, c - a).y); 59 | var crossD = Mathf.Sign(Vector3.Cross(b - a, d - a).y); 60 | 61 | if (Mathf.Approximately(crossC, crossD)) return false; 62 | 63 | return true; 64 | } 65 | 66 | #if UNITY_EDITOR 67 | void OnDrawGizmos() 68 | { 69 | if (pointsArray == null) return; 70 | 71 | var cacheMatrix = UnityEditor.Handles.matrix; 72 | UnityEditor.Handles.matrix = transform.localToWorldMatrix; 73 | 74 | Action drawPoints = () => 75 | { 76 | for (int i = 0; i < pointsArray.Length; i++) 77 | { 78 | var a = pointsArray[i]; 79 | var b = pointsArray[(i + 1) % pointsArray.Length]; 80 | 81 | if (a == null) continue; 82 | if (b == null) continue; 83 | 84 | var minA = a.localPosition; 85 | var minB = b.localPosition; 86 | 87 | var maxA = a.localPosition; 88 | var maxB = b.localPosition; 89 | 90 | minA.y = -height; 91 | minB.y = -height; 92 | 93 | maxA.y = height; 94 | maxB.y = height; 95 | 96 | UnityEditor.Handles.DrawAAPolyLine(minA, minB); 97 | UnityEditor.Handles.DrawAAPolyLine(maxA, maxB); 98 | 99 | 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-------------------------------------------------------------------------------- 1 | fileFormatVersion: 2 2 | guid: 4c32d938a00d58b4bae162aaede1c998 3 | DefaultImporter: 4 | externalObjects: {} 5 | userData: 6 | assetBundleName: 7 | assetBundleVariant: 8 | -------------------------------------------------------------------------------- /Preview.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hont127/Unity3D-ConvexHull/bff5ed8cef2fab324510bf8e6e0924999ed81cd0/Preview.gif -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Unity3D-ConvexHull 2 | Easy Unity3d ConvexHull range detecter 3 | 一个简单的unity凸/凹包范围检测器，可以用作场景事件碰撞等 4 | 5 | ```C# 6 | if (convexHull.IsInRange(transform.position)) //do something.. 7 | ``` 8 | 9 | ![](https://github.com/hont127/Unity3D-ConvexCull/blob/master/Preview.gif) 10 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