Mesh:
- vertices:
- normals:
- uv:
- tangents:
- boneWeights :
- colors/colors32:
//頂點位置數組
public Vector3[] vertices ;
//兩種方法更改
//public void SetVertices (List<Vector3> inVertices);
mesh.SetVertices(vertices);
mesh.vertices = vertices;
//改變 vertices 后通常需要重新計算包圍盒
mesh.RecalculateBounds();
//每一個頂點的法線方向
public Vector3[] normals ;
//uv列表
public Vector2[] uv ;
//網格的切線。
//切線最常用於凹凸貼圖着色器中。切線是單位長度的矢量，它順着網格 表面沿水平 (U) 紋理方向。Unity 中的切線表示為 Vector4， 其“x,y,z”分量定義矢量，而 w 用於在需要時翻轉副法線。
//Unity 計算另一個表面矢量（副法線）的方法是獲取法線與切線 之間的叉積，然后將結果乘以切線的 w。因此，w 應始終為 1 或 -1。
//如果計划在網格上使用凹凸貼圖着色器，則應自己計算切線。 在分配 normals 或使用 RecalculateNormals 之后分配切線。
//注意：若要對 tangents 進行更改，從 Mesh 復制 切線十分重要。復制和更改 tangents 之后，normals 即可重新分配回 Mesh。
public Vector4[] tangents ;
//每個頂點的骨骼權重。
public BoneWeight[] boneWeights ;
//網格的頂點顏色。
//如果沒有頂點顏色可用，則返回空數組。
public Color[] colors ;
//與 colors 相同，但是使用 Color32 結構的性能更好。
public Color32[] colors32 ;
- triangles:
//該數組是三角形的列表，包含頂點數組的索引，長度必須始終是 3 的倍數。
//使用此屬性分配三角形數組時，subMeshCount 設置為 1。如果要具有多個子網格，請使用 SetTriangles。
public int[] triangles ;
public void SetTriangles (int[] triangles, int submesh, bool calculateBounds= true, int baseVertex= 0);
public void SetTriangles (int[] triangles, int submesh);
public void SetTriangles (List<int> triangles, int submesh, bool calculateBounds= true, int baseVertex= 0);
public void SetTriangles (List<int> triangles, int submesh);
public int[] GetTriangles (int submesh);
public int[] GetTriangles (int submesh, bool applyBaseVertex= true);
public void GetTriangles (List<int> triangles, int submesh, bool applyBaseVertex= true);
public void GetTriangles (List<int> triangles, int submesh);
//決定索引的布局為三角形、四邊形等
public MeshTopology GetTopology (int submesh);
//* SetIndices 、GetIndices 、GetIndexStart 、GetIndexCount
//* 子網格的 GetIndices 方法得到索引列表，始終是在 mesh.vertices 中截取的范圍，范圍的起始索引為 GetIndexStart ，數量為 GetIndexCount。
//* 只能通過 SetIndices 來指定截取的范圍。
//* 當為 MeshTopology(網格拓撲) 為 MeshTopology.Triangles(三角形) 時， GetIndices 與 GetTriangles 得到的結果是一致的
public void SetIndices (int[] indices, MeshTopology topology, int submesh, bool calculateBounds);
public void SetIndices (int[] indices, MeshTopology topology, int submesh);
public void SetIndices (int[] indices, MeshTopology topology, int submesh, bool calculateBounds= true, int baseVertex= 0);
public void GetIndices (List<int> indices, int submesh);
public int[] GetIndices (int submesh)
public uint GetIndexStart (int submesh);
public uint GetIndexCount (int submesh);
1.從頭開始構建網格： 應始終按以下順序進行： 分配 vertices -> 分配 triangles。
using UnityEngine;
public class Example : MonoBehaviour
{
Vector3[] newVertices;
Vector2[] newUV;
int[] newTriangles;
void Start()
{
Mesh mesh = new Mesh();
GetComponent<MeshFilter>().mesh = mesh;
mesh.vertices = newVertices;
mesh.uv = newUV;
mesh.triangles = newTriangles;
}
}
2.每一幀都修改頂點屬性：
a) 獲取頂點
b) 修改它們
c) 將它們分配回網格。
using UnityEngine;
public class Example : MonoBehaviour
{
void Update()
{
Mesh mesh = GetComponent<MeshFilter>().mesh;
Vector3[] vertices = mesh.vertices;
Vector3[] normals = mesh.normals;
for (var i = 0; i < vertices.Length; i++)
{
vertices[i] += normals[i] * Mathf.Sin(Time.time);
}
mesh.vertices = vertices;
}
}
3.連續更改網格三角形和頂點：
a) 調用 Clear 以開始刷新
b) 分配頂點和其他屬性
c) 分配三角形索引。
在分配新頂點或三角形之前調用 Clear 十分重要。 Unity 始終檢查提供的三角形索引是否未引用超出邊界的頂點。 調用 Clear，分配頂點，然后分配三角形可確保不會有超出邊界的數據。
using UnityEngine;
public class ExampleClass : MonoBehaviour
{
Vector3[] newVertices;
Vector2[] newUV;
int[] newTriangles;
void Start()
{
Mesh mesh = GetComponent<MeshFilter>().mesh;
mesh.Clear();
// Do some calculations...
mesh.vertices = newVertices;
mesh.uv = newUV;
mesh.triangles = newTriangles;
}
}
創建四邊形示例
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class TestCreateMesh : MonoBehaviour{
public float width=2f;
public float height=1f;
private void Start(){
MeshFilter mf = GetComponent<MeshFilter>();
Mesh mesh = new Mesh();
mf.mesh = mesh;
Vector3[] vertices = new Vector3[4];
vertices[0] = new Vector3(0, 0, 0);
vertices[1] = new Vector3(width, 0, 0);
vertices[2] = new Vector3(0, height, 0);
vertices[3] = new Vector3(width, height, 0);
mesh.vertices = vertices;
int[] tri = new int[6];
tri[0] = 0;
tri[1] = 2;
tri[2] = 1;
tri[3] = 2;
tri[4] = 3;
tri[5] = 1;
mesh.triangles = tri;
Vector3[] normals = new Vector3[4];
normals[0] = Vector3.back;
normals[1] = Vector3.back;
normals[2] = Vector3.back;
normals[3] = Vector3.back;
mesh.normals = normals;
Vector2[] uv = new Vector2[4];
uv[0] = new Vector2(0, 0);
uv[1] = new Vector2(1, 0);
uv[2] = new Vector2(0, 1);
uv[3] = new Vector2(1, 1);
mesh.uv = uv;
}
}
不同材質多個子網格示例（在上面例子基礎上，在左側添加一個不同材質的矩形）
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class TestCreateMesh : MonoBehaviour{
public float width=2f;
public float height=1f;
private void Start(){
MeshFilter mf = GetComponent<MeshFilter>();
Mesh mesh = new Mesh();
mf.mesh = mesh;
Vector3[] vertices = new Vector3[4];
vertices[0] = new Vector3(0, 0, 0);
vertices[1] = new Vector3(width, 0, 0);
vertices[2] = new Vector3(0, height, 0);
vertices[3] = new Vector3(width, height, 0);
mesh.vertices = vertices;
int[] tri = new int[6];
tri[0] = 0;
tri[1] = 2;
tri[2] = 1;
tri[3] = 2;
tri[4] = 3;
tri[5] = 1;
mesh.triangles = tri;
Vector3[] normals = new Vector3[4];
normals[0] = Vector3.back;
normals[1] = Vector3.back;
normals[2] = Vector3.back;
normals[3] = Vector3.back;
mesh.normals = normals;
Vector2[] uv = new Vector2[4];
uv[0] = new Vector2(0, 0);
uv[1] = new Vector2(1, 0);
uv[2] = new Vector2(0, 1);
uv[3] = new Vector2(1, 1);
mesh.uv = uv;
//********************************
//在左側添加一個不同材質的矩形。注意： MeshRenderer.Materials 需要設置2個材質
Vector3[] vertices2=new Vector3[vertices.Length+4];
Array.Copy(vertices,vertices2,4);
vertices2[4] = new Vector3(0, 0, width);
vertices2[5] = new Vector3(0, 0, 0);
vertices2[6] = new Vector3(0, height, width);
vertices2[7] = new Vector3(0, height, 0);
mesh.vertices=vertices2;
int[] tri2 = new int[tri.Length+6];
Array.Copy(tri,tri2,6);
tri2[6] = 4;
tri2[7] = 6;
tri2[8] = 5;
tri2[9] = 6;
tri2[10] = 7;
tri2[11] = 5;
mesh.triangles = tri2;
Vector3[] normals2 = new Vector3[normals.Length+4];
Array.Copy(normals,normals2,4);
normals2[4] = Vector3.left;
normals2[5] = Vector3.left;
normals2[6] = Vector3.left;
normals2[7] = Vector3.left;
mesh.normals = normals2;
Vector2[] uv2 = new Vector2[uv.Length+4];
Array.Copy(uv,uv2,4);
uv2[4] = new Vector2(0, 0);
uv2[5] = new Vector2(1, 0);
uv2[6] = new Vector2(0, 1);
uv2[7] = new Vector2(1, 1);
mesh.uv = uv2;
mesh.subMeshCount=2;
//方法1：使用 SetIndices 方法 MeshTopology.Triangles 時，索引列表必須為3的倍數
mesh.SetIndices(new int[]{0,2,1, 2,3,1},MeshTopology.Triangles,0,true);
mesh.SetIndices(new int[]{4,6,5, 6,7,5},MeshTopology.Triangles,1,true);
//方法2：使用 SetTriangles
//mesh.SetTriangles(new int[]{0,2,1, 2,3,1},0,true);
//mesh.SetTriangles(new int[]{4,6,5, 6,7,5},1,true);
}
}
程序化網格幾何體（Unity）
https://docs.unity.cn/cn/current/Manual/GeneratingMeshGeometryProcedurally.html
Mesh（Unity）
https://docs.unity.cn/cn/current/ScriptReference/Mesh.html
Unity中動態創建Mesh
https://www.cnblogs.com/answer-yj/p/11231247.html
使用Mesh創建一個Cube
https://www.cnblogs.com/kyokuhuang/p/4191169.html
水模型動態運動
https://blog.csdn.net/qwsx789/article/details/80351385
關於圖形切割的問題
https://blog.csdn.net/thunderdreamer_or/article/details/104184589
unity實現任意多邊形三角剖分
https://blog.csdn.net/huangzengman/article/details/77114082
圖片轉化為3d物體插件_UCLA Mesh Creator
https://blog.csdn.net/lizhenxiqnmlgb/article/details/82854800
將SpriteRenderer組件轉換為Mesh
https://www.weixiuzhan.cn/news/show-17973.html