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xwc2022
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準備頂點的相鄰三角形資訊
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8 files changed

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-20
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8 files changed

+147
-20
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‎Assembly-CSharp.csproj

+1
Original file line numberDiff line numberDiff line change
@@ -123,6 +123,7 @@
123123
<Compile Include="Assets\Pack\DiyTerrain\Script\Brush.cs" />
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<Compile Include="Assets\Pack\DiyTerrain\Script\ShowMeshBound.cs" />
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<Compile Include="Assets\scripts\Level\ManyBike.cs" />
126+
<Compile Include="Assets\scripts\GravityGenerator\GravitySensor.cs" />
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<None Include="Assets\Pack\DiyTerrain\shaders\ToSphere.shader" />
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<None Include="Assets\Pack\DiyTerrain\shaders\ToSpherePBR.shader" />
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<None Include="Assets\Pack\DiyTerrain\shaders\brush\brush_fill.shader" />

‎Assets/Prefab/GravitySensor.prefab

1.15 KB
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‎Assets/Scenes/knot.unity

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‎Assets/scripts/GravityGenerator/GravitySensor.cs

+21
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,21 @@
1+
using System.Collections.Generic;
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using UnityEngine;
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public class GravitySensor : MonoBehaviour
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{
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public List<int> neighborTriangleIndex;
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public void init() { neighborTriangleIndex = new List<int>(); }
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public void addNeighborTriangleIndex(int index)
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{
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neighborTriangleIndex.Add(index);
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}
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public int triangelIndex;
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public string info()
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{
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var len = neighborTriangleIndex.Count;
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var msg = "";
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for (var i = 0; i < len; ++i)
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msg += neighborTriangleIndex[i] + ",";
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return msg;
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}
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}

‎Assets/scripts/GravityGenerator/GravitySensor.cs.meta

+11
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‎Assets/scripts/GravityGenerator/MeshGravityGenerator.cs

+68-11
Original file line numberDiff line numberDiff line change
@@ -1,32 +1,87 @@
1-
using UnityEngine;
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using System.Collections.Generic;
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using UnityEngine;
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//非球圓形星球：像是Donuts、Knot
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public class MeshGravityGenerator : MonoBehaviour, GroundGravityGenerator
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{
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public float findingGravitySensorR = 4;
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public Transform gs;
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7+
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public float findingGravitySensorR = 4;
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Collider[] colliderList = new Collider[100];//大小看需求自己設定
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Color purple = new Color(159.0f / 255, 90.0f / 255, 253.0f / 255);
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void Awake()
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{
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createGS();
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Mesh mesh = GetComponent<MeshFilter>().sharedMesh;
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triangles = mesh.triangles;
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vertices = mesh.vertices;
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normals = mesh.normals;
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createGravitySensor();
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}
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public void createGS()
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int[] triangles;
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Vector3[] vertices;
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Vector3[] normals;
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GravitySensor[] gsList;
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public GravitySensor gravitySensorPrefab; // Prefab
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void createGravitySensor()
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{
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Mesh mesh = GetComponent<MeshFilter>().sharedMesh;
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var modelPos = transform.position;
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int vCount = mesh.vertices.Length;
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Vector3[] vertices = mesh.vertices;
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Vector3[] normals = mesh.normals;
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int vCount = vertices.Length;
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// 跑1次所有vertex
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gsList = new GravitySensor[vCount];
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for (int i = 0; i < vCount; i++)
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{
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var v0 = vertices[i];
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var n0 = normals[i];
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Quaternion rot0 = Quaternion.LookRotation(n0);
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Instantiate(gs, v0 + modelPos, rot0, this.transform);
39+
var gs = Instantiate(gravitySensorPrefab, v0 + modelPos, rot0, this.transform);
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gs.init();
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gs.triangelIndex = i;
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gs.name = "gs" + i;
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gsList[i] = gs;
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}
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// 跑1次所有三角形
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int triCount = triangles.Length / 3;
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for (int i = 0; i < triCount; ++i)
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{
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int v0Index = triangles[3 * i];
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int v1Index = triangles[3 * i + 1];
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int v2Index = triangles[3 * i + 2];
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gsList[v0Index].addNeighborTriangleIndex(i);
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gsList[v1Index].addNeighborTriangleIndex(i);
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gsList[v2Index].addNeighborTriangleIndex(i);
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}
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}
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void createGravityDir(GravitySensor gs)
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{
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// 找出位在那個三角形上
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var triIndexList = gs.neighborTriangleIndex;
63+
// print(triIndexList.Count + "->" + gs.info());
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65+
var triCount = triIndexList.Count;
66+
for (var i = 0; i < triCount; ++i)
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{
68+
var triIndex = triIndexList[i];
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int v0Index = triangles[3 * triIndex];
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int v1Index = triangles[3 * triIndex + 1];
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int v2Index = triangles[3 * triIndex + 2];
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print(v0Index + "," + v1Index + "," + v2Index);
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var v0 = vertices[v0Index];
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var v1 = vertices[v1Index];
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var v2 = vertices[v2Index];
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var parentPos = transform.position;
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v0 += parentPos;
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v1 += parentPos;
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v2 += parentPos;
82+
Debug.DrawLine(v0, v1, Color.red);
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Debug.DrawLine(v1, v2, Color.green);
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Debug.DrawLine(v2, v0, Color.blue);
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}
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}
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@@ -53,6 +108,8 @@ public Vector3 findGravityDir(Vector3 headUp, Vector3 targetPos, bool isHitFloor
53108
nearestDistance = nowDistance;
54109
}
55110
}
111+
var gs = nearestC.GetComponent<GravitySensor>();
112+
createGravityDir(gs);
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Debug.DrawRay(nearestC.transform.position, nearestC.transform.forward * 5, purple);
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return -nearestC.transform.forward;

‎Assets/scripts/Tool/GeometryTool.cs

+37
Original file line numberDiff line numberDiff line change
@@ -97,4 +97,41 @@ public static void GetShootingRay(Vector3 mousePos, out Vector3 from, out Vector
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else
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GeometryTool.GetShootingRayPerspective(mousePos, out from, out dir);
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}
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// 這些點z都是0
102+
static void CalculateBarycentricCoordinates(Vector3 s0, Vector3 s1, Vector3 s2, Vector3 P, ref bool success, out float α, out float β, out float γ)
103+
{
104+
var diff = P - s0;
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106+
// https://1.bp.blogspot.com/-csct6vAS1vs/YajSLKgW1WI/AAAAAAABDd8/shSLs78p274fnRa3R5fv3wN9dNS5WCN3wCPcBGAsYHg/s4618/screen_sapce.png
107+
// 求ray(P,S0-S2)和ray(S0,S1-S2)的交點
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// 等同於求ray(P,S0-S2)和平面的交點
109+
var dir01 = s1 - s0;
110+
var dir02 = s2 - s0;
111+
112+
var help = Vector3.Cross(dir01, dir02);
113+
var n = Vector3.Cross(help, dir01); // 不需要正規化
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115+
Vector3 hitPos;
116+
var result = RayHitPlane(P, -dir02, s0, n, out hitPos);
117+
if (!result)
118+
{
119+
// 退化成直線的三角形才有也可能
120+
// console.log('平行', s0, s1, s2, P);
121+
success = false;
122+
}
123+
124+
var p_on_dir01 = hitPos;
125+
var vector_α = p_on_dir01 - s0;
126+
var vector_β = diff - vector_α;
127+
128+
// 擋掉dir01、dir02是y軸平行的情況
129+
// 浮點數請用 number_equal，不然會GG
130+
// 見圖：bug/float_point_compaire_error(fixed)/bug_when_clipping_2.jpg
131+
// 其實當初直接用長度比算α、β不是更簡單嗎？
132+
α = vector_α.magnitude / dir01.magnitude;
133+
β = vector_β.magnitude / dir02.magnitude;
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135+
γ = 1 - α - β;
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}
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}

‎UserSettings/EditorUserSettings.asset

+9-9
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@@ -6,31 +6,31 @@ EditorUserSettings:
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serializedVersion: 4
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m_ConfigSettings:
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value: 22424703114646680e0b0227036c7b1f18020c39193b2f3e2a1d1221f7f3132ae3f13ffdfe742a323016f6
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flags: 0
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RecentlyUsedScenePath-1:
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value: 22424703114646680e0b0227036c4f1c17191d3e0a21283e633c133af6f9
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