Unity Mash实现战斗飘血

什么是Mesh

Mesh是指的模型的网格，3D模型是由多边形拼接而成，而多边形实际上又是由多个三角形拼接而成的。即一个3D模型的表面其实是由多个彼此相连的三角面构成。三维空间中，构成这些三角形的点和边的集合就是Mesh

为什么要用Mesh实现战斗飘血

我们都做游戏的时候，都是知道一个很熟悉的词汇“预设体”，它在游戏开发过程中有这举足轻重的地位，时刻时刻都能见到他的身影。我们可以通过预设体的特征克隆出大量的具有相同性质的游戏物体，我上一个项目的的飘血实现就是用不断的克隆预设体实现的。由于战斗的节奏很快，所以会创建很多的飘血对象。比如场景有一百条飘血展示，这个时候客户端就需要存在一百条飘血的对象。这个对内存的消耗是很大，并且没有必要的。
问：“有什么改进的方法吗”？
答：“有的”。

工作原理

我们可以通过Mesh来实现，

创建Mesh对象
初始化Mash的顶点数据，UV数据
根据输入的内容设置顶点数据，UV数据
在Mesh渲染出来

详细过程

附上代码，只有稍微对Mesh有点了解的你，这些代码都不是问题：

1.SpriteHeper

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class SpriteHelper
{private Rect uvRect;private Font font;bool isDynamic;public Font getFont { get { return font; } }Dictionary<char, CharacterInfo> m_dicCharacter;Dictionary<char, CharacterInfo> characterTable{get{if (m_dicCharacter == null)m_dicCharacter = new Dictionary<char, CharacterInfo>();return m_dicCharacter;}}public SpriteHelper(Font fontInfo, bool isDynamic){font = fontInfo;if (font.dynamic != isDynamic){Debugger.LogError("字体类型不符合，请修改！");}this.isDynamic = isDynamic;}public Rect GetSpriteRect(char index){return GetFontUv(index);}public Rect GetFontUv(char index){CharacterInfo cha;if (GetCharacterInfo(index, out cha)){uvRect = new Rect(cha.uvBottomLeft, cha.uvTopRight - cha.uvBottomLeft);if (uvRect.width < 0){uvRect.x += uvRect.width;uvRect.width *= -1;}if (uvRect.height < 0){uvRect.y += uvRect.height;uvRect.height *= -1;}return uvRect;}return Rect.zero;}internal bool GetCharacterInfo(char c, out CharacterInfo info){if (isDynamic){return font.GetCharacterInfo(c, out info);}else{if (!characterTable.TryGetValue(c, out info)){if (font.GetCharacterInfo(c, out info))characterTable.Add(c, info);elseDebugger.LogError("静态字体没有文字[{0}]，请修复", c);}return true;}}
}

UIMeshTextGenerator

using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using UnityEngine;public class UIMeshText
{public Color?[] colorArray;public string originString; //起始public string outPutString; // 输出public Vector2 offset;public float[] minX;public float[] minY;public float[] maxX;public float[] maxY;public float[] advance;public Vector3 pos;public float scale;public Color color;public Vector3 scaleVec = Vector3.zero;public UIMeshText(string originStr){originString = originStr;colorArray = new Color?[originStr.Length];}}public class UIMeshTextGenerator
{StringBuilder m_textBuilder;static readonly Regex m_colorRegex = new Regex(@"<color=(#[a-zA-Z0-9]{6,8})>(.*?)</color>", RegexOptions.Singleline);public UIMeshTextGenerator(){m_textBuilder = new StringBuilder();}public UIMeshText GeneratText(string originStr){UIMeshText meshText = new UIMeshText(originStr);meshText.outPutString = originStr;meshText.minX = new float[meshText.outPutString.Length];meshText.minY = new float[meshText.outPutString.Length];meshText.maxX = new float[meshText.outPutString.Length];meshText.maxY = new float[meshText.outPutString.Length];meshText.advance = new float[meshText.outPutString.Length];return meshText;}private void FillOutPutClass(string originStr, UIMeshText meshText){m_textBuilder.Length = 0;int textIndex = 0;foreach (Match match in m_colorRegex.Matches(originStr)){m_textBuilder.Append(originStr.Substring(textIndex, match.Index - textIndex));int trueIndex = m_textBuilder.Length;m_textBuilder.Append(match.Groups[2].Value);for (int i = 0; i < match.Groups[2].Value.Length; i++)meshText.colorArray[trueIndex + i] = GetColot(match.Groups[1].Value);textIndex = match.Index + match.Length;}m_textBuilder.Append(originStr.Substring(textIndex, originStr.Length - textIndex));meshText.outPutString = m_textBuilder.ToString();}private Color GetColot(string colorStr){Color colour;ColorUtility.TryParseHtmlString(colorStr, out colour);return colour;}}

3 . UIMesh

using System.Collections;
using System.Collections.Generic;
using System;
using UnityEngine;
using UnityEngine.UI;
using System.Text;public class VertPool
{private int maxVertNum;private int[] blocks;           //顶点private char[] charList;public VertPool(int maxVert){maxVertNum = maxVert;blocks = new int[maxVert % 4 == 0 ? maxVert >> 2 : maxVert >> 2 + 1];   // 取4的倍数charList = new char[maxVert % 4 == 0 ? maxVert >> 2 : maxVert >> 2 + 1];}// 获取一个顶点public int GetVert(){for (int i = 0; i < blocks.Length; i++){if (blocks[i] >= 0){blocks[i] = -1;return i;}}Debug.Log("No Available Vertex");return -1;}public int GetVert(char value){for (int i = 0; i < blocks.Length; i++){if (blocks[i] >= 0){blocks[i] = -1;charList[i] = value;return i;}}Debug.Log("No Available Vertex");return -1;}// 顶点数是否足够public bool TestVert(int nCount){int nCurCount = 0;for (int i = 0; i < blocks.Length; i++){if (blocks[i] >= 0){nCurCount++;if (nCurCount > nCount){return true;}}}return false;}public int[] GetBlocks { get { return blocks; } }public char[] GetCharList { get { return charList; } }//释放public void ReleaseVert(int id){if (id < blocks.Length && blocks[id] < 0){blocks[id] = 0;}}}public class UIMesh
{private GameObject gameObj;private MeshFilter meshFilter;private MeshRenderer meshRenderer;private Vector3[] vertices;               //顶点private Vector2[] uvs;                    //uv 顶点private Color[] colors;private int[] triangles;                //三角形 private Mesh mesh;private VertPool vp;                    //顶点对象池private SpriteHelper spriteHelper;private bool m_isDrawUving = false;     // 正在绘制Uvprivate Vector2 m_rectVec = Vector2.zero;private Vector3 m_vertOffsetVec = Vector3.zero;private Dictionary<List<int>, UIMeshText> m_requireList;private UIMeshTextGenerator textGenerator;public RectTransform rectTransform;private bool bShow = false;private bool needRefresh = false;private bool dynamic = false;       //是否动态private bool uvNeedRebuild = false;private float critScale = 0.7f;public UIMesh(GameObject parent, string name, Font font, bool isdynamic = false, int vertCount = 2040){CreateMeshObject(name, parent);CreateMeshComponent(font.material);InitCapacity(vertCount);spriteHelper = new SpriteHelper(font, isdynamic);m_requireList = new Dictionary<List<int>, UIMeshText>();textGenerator = new UIMeshTextGenerator();dynamic = isdynamic;this.gameObj.SetActive(false);if (isdynamic){Font.textureRebuilt += OnFontTextureRebuild;}else{meshRenderer.material.shader = UnityEngine.UI.Text.defaultGraphicMaterial.shader;}}public void SetRenderQueue(int nQueue){meshRenderer.material.renderQueue = nQueue;}public void Show(bool bShow){if (this.bShow == bShow){return;}this.bShow = bShow;this.gameObj.SetActive(bShow);}public Vector3 GetVectorInMesh(Vector3 worldPos){return gameObj.transform.InverseTransformPoint(worldPos);}//创建对象private void CreateMeshObject(string name, GameObject parent){gameObj = new GameObject();gameObj.name = name;gameObj.transform.SetParent(parent.transform);}//添加脚本private void CreateMeshComponent(Material meshMaterial){rectTransform = gameObj.AddComponent<RectTransform>();meshFilter = gameObj.AddComponent<MeshFilter>();meshRenderer = gameObj.AddComponent<MeshRenderer>();meshRenderer.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;meshRenderer.lightProbeUsage = UnityEngine.Rendering.LightProbeUsage.Off;meshRenderer.reflectionProbeUsage = UnityEngine.Rendering.ReflectionProbeUsage.Off;meshRenderer.receiveShadows = false;meshRenderer.material = meshMaterial;mesh = new Mesh();mesh.name = gameObj.name;meshFilter.mesh = mesh;}//初始化顶点数据private void InitCapacity(int vertCount){vertices = new Vector3[vertCount];uvs = new Vector2[vertCount];triangles = new int[(vertCount - 2) * 3];      colors = new Color[vertCount];vp = new VertPool(vertCount);}public void OnFontTextureRebuild(Font changedFont){if (changedFont != spriteHelper.getFont)return;RebuildMesh();}private void ReDrawVerts(int vertIndex, float vertPosx, float vertPosy, Color vertColor, float vertAngle = 0){if (vertAngle != 0)RotationZ(vertAngle, ref vertPosx, ref vertPosy);vertices[vertIndex].x = vertPosx;vertices[vertIndex].y = vertPosy;colors[vertIndex] = vertColor;}private void ReDrawUVs(int vertIndex, float uvVectorx, float uvVectory){uvs[vertIndex].x = uvVectorx;uvs[vertIndex].y = uvVectory;}/// <summary>/// 通过旋转矩阵对顶点进行旋转，等同于修改unity中的rotation/// </summary>/// <param name="angle"></param>/// <param name="vertX"></param>/// <param name="vertY"></param>private void RotationZ(float angle, ref float vertX, ref float vertY){float x, y;float CosAngle = Mathf.Cos(angle * Mathf.Deg2Rad);float SinAngle = Mathf.Sin(angle * Mathf.Deg2Rad);x = vertX * CosAngle - SinAngle * vertY;y = vertX * SinAngle + CosAngle * vertY;vertX = x;vertY = y;}/// <summary>/// 绘制一个正方形，占用4个顶点。根据顶点下标，绘制位置，图集宽高，uv位置绘制。/// </summary>/// <param name="vertIndex">顶点下标，不是4的倍数会从4的倍数开始绘制</param>/// <param name="drawRect">xy为绘制起点(左下角)，宽高代表绘制大小与缩放,使用世界坐标</param>/// <param name="uvRect">xy是左下角uv坐标值。根据这个值算出四个点的uv</param>private void DrawMesh(int vertIndex, Rect drawRect, Rect uvRect, Color drawColor, float vertAngle = 0){return;if (vertIndex % 4 != 0){vertIndex = vertIndex >> 2 << 2;}int vertStartIndex = vertIndex;int triglesIndex = vertIndex * 6 / 4;ReDrawVerts(vertIndex, drawRect.x, drawRect.y, drawColor, vertAngle);ReDrawUVs(vertIndex, uvRect.x, uvRect.y);ReDrawVerts(++vertIndex, drawRect.x, drawRect.y + drawRect.height, drawColor, vertAngle);ReDrawUVs(vertIndex, uvRect.x, (uvRect.y + uvRect.height));ReDrawVerts(++vertIndex, drawRect.x + drawRect.width, drawRect.y + drawRect.height, drawColor, vertAngle);ReDrawUVs(vertIndex, (uvRect.x + uvRect.width), (uvRect.y + uvRect.height));ReDrawVerts(++vertIndex, drawRect.x + drawRect.width, drawRect.y, drawColor, vertAngle);ReDrawUVs(vertIndex, (uvRect.x + uvRect.width), uvRect.y);SetTriangle(triglesIndex, vertStartIndex);}private void SetTriangle(int triangleIndex, int vertIndex){triangles[triangleIndex] = vertIndex;triangles[triangleIndex + 1] = vertIndex + 1;triangles[triangleIndex + 2] = vertIndex + 2;triangles[triangleIndex + 3] = vertIndex;triangles[triangleIndex + 4] = vertIndex + 2;triangles[triangleIndex + 5] = vertIndex + 3;}void SetColor(int index, Color color){colors[index + 0] = color;colors[index + 1] = color;colors[index + 2] = color;colors[index + 3] = color;}//构建Meagpublic void RebuildMesh(){if (m_isDrawUving){return;}var blocks = vp.GetBlocks;var charList = vp.GetCharList;for (int i = 0; i < blocks.Length; i++){if (blocks[i] == -1){CharacterInfo ch;if (!spriteHelper.GetCharacterInfo(charList[i], out ch)){uvNeedRebuild = true;return;}SetUv(i << 2, ch);}}needRefresh = true;}private void SetUv(int index, CharacterInfo ch){//矩形的四个顶点var uvTopLeft = ch.uvTopLeft;var uvTopRight = ch.uvTopRight;var uvBottomRight = ch.uvBottomRight;var uvBottomLeft = ch.uvBottomLeft;if (uvTopLeft == uvTopRight){return;}uvs[index + 1] = uvTopLeft;uvs[index + 2] = uvTopRight;uvs[index + 3] = uvBottomRight;uvs[index + 0] = uvBottomLeft;}public void Update(){if (!this.bShow){return;}if (needRefresh){RefreshMesh();needRefresh = false;}if (null == m_requireList || dynamic == false){return;}var e = m_requireList.GetEnumerator();while (e.MoveNext()){spriteHelper.getFont.RequestCharactersInTexture(e.Current.Value.outPutString);}if (uvNeedRebuild){uvNeedRebuild = false;RebuildMesh();}}private void RefreshMesh(){mesh.vertices = vertices;mesh.uv = uvs;mesh.triangles = triangles;mesh.colors = colors;}private Vector3 SetVertOffsetVector(Vector3 pos, float x, float y){pos.x += x;pos.y += y;return pos;}private void SetVert(int index, Vector3 pos, float maxX, float maxY, Vector3 scale){int x = maxX > 0 ? 1 : -1;int y = maxY > 0 ? 1 : -1;if (y < 0){pos.y += scale.y;}vertices[index + 1] = SetVertOffsetVector(pos, 0, scale.y * y);vertices[index + 2] = SetVertOffsetVector(pos, scale.x * x, scale.y * y);vertices[index + 3] = SetVertOffsetVector(pos, scale.x * x, 0);vertices[index + 0] = pos;}public void RefreshDynamicPos(List<int> vertIndexList, Vector3 pos, Vector3 scale){if (null == vertIndexList) return;UIMeshText meshText = m_requireList[vertIndexList];if (pos == meshText.pos)return;meshText.pos = pos;meshText.scaleVec = scale;pos.x -= scale.x * 0.5f;m_isDrawUving = true;var listCount = vertIndexList.Count;for (int i = 0; i < listCount; i++){int verticeStartIndex = vertIndexList[i] << 2;SetVert(verticeStartIndex, pos, meshText.maxX[i], meshText.maxY[i], scale);pos.x += meshText.advance[i] * scale.z;}needRefresh = true;m_isDrawUving = false;}public void RefreshDynamicPos(List<int> vertIndexList, string showString, Vector3 pos, float scale, Color color, float scaleGlobal = 0.1f){if (null == vertIndexList) return;UIMeshText meshText = m_requireList[vertIndexList];if (showString == meshText.originString && pos == meshText.pos && color == meshText.color)return;meshText.pos = pos;meshText.color = color;showString = meshText.outPutString;if (showString != null){pos.x -= meshText.offset.x * 0.5f;}m_isDrawUving = true;var listCount = vertIndexList.Count;for (int i = 0; i < listCount; i++){int verticeStartIndex = vertIndexList[i] << 2;//Color c = meshText.colorArray[i] == null ? color : (Color)meshText.colorArray[i];SetVert(verticeStartIndex, pos, meshText.minX[i], meshText.minY[i], meshText.maxX[i], meshText.maxY[i], scale);SetColor(verticeStartIndex, color);pos.x += meshText.advance[i] * scale;}needRefresh = true;m_isDrawUving = false;}public void RefreshDynamicPos(List<int> vertIndexList, Color color){if (null == vertIndexList) return;UIMeshText meshText = m_requireList[vertIndexList];if (color == meshText.color)return;meshText.color = color;m_isDrawUving = true;var listCount = vertIndexList.Count;for (int i = 0; i < listCount; i++){int verticeStartIndex = vertIndexList[i] << 2;SetColor(verticeStartIndex, color);}needRefresh = true;m_isDrawUving = false;}public void RefreshDynamicPos(List<int> vertIndexList, string showString, Vector3 pos, Vector3 scale, Color color, float scaleGlobal = 0.1f){if (null == vertIndexList) return;UIMeshText meshText = m_requireList[vertIndexList];showString = meshText.outPutString;if (showString == meshText.originString && pos == meshText.pos && color == meshText.color && meshText.scaleVec == scale) return;meshText.pos = pos;meshText.color = color;meshText.scaleVec = scale;pos.x -= scale.x * 0.5f;m_isDrawUving = true;var listCount = vertIndexList.Count;for (int i = 0; i < listCount; i++){int verticeStartIndex = vertIndexList[i] << 2;//Color c = color//meshText.colorArray[i] == null ? color : (Color)meshText.colorArray[i];SetVert(verticeStartIndex, pos, meshText.maxX[i], meshText.maxY[i], scale);SetColor(verticeStartIndex, color);pos.x += meshText.advance[i] * scale.z;}needRefresh = true;m_isDrawUving = false;}public void LuanMa(List<int> vertIndexList){StringBuilder sb = new StringBuilder();for (int i = 0; i < vertIndexList.Count; i++){int vertIndex = vertIndexList[i];int index = vertIndex << 2;sb.Append(string.Format("{0}=", vertIndex));for (int k = 0; k < 4; k++){sb.Append(string.Format("({0:0.000000},{1:0.000000}) ", uvs[index + k].x, uvs[index + k].y));}sb.Append("\n");}Debugger.Log("strUV==" + sb.ToString());}public void SetUVNeedRebuild(){uvNeedRebuild = true;}public Vector2 GetTextOffset(List<int> vertIndexList, float scale){if (null == vertIndexList)return Vector2.zero;UIMeshText meshText = m_requireList[vertIndexList];if (meshText != null)return meshText.offset;return Vector2.zero;}public List<int> DrawDynamicTextUVs(string showString, Vector3 pos, float scale, Color color, float scaleGlobal = 0.1f, bool isCrit = false){if (!vp.TestVert(showString.Length)){return null;}UIMeshText meshText = textGenerator.GeneratText(showString);meshText.pos = pos;meshText.scale = scale;meshText.color = color;if (dynamic)spriteHelper.getFont.RequestCharactersInTexture(meshText.outPutString);List<int> indexArray = new List<int>();int vertIndex;bool bSuccess = true;var offsets = GetTextRect(meshText.outPutString, scale, out bSuccess);if (!bSuccess){Debugger.LogError("DrawDynamicTextUVs uv error={0}", showString);return null;}meshText.offset = offsets;pos.x -= offsets.x * 0.5f;for (int i = 0; i < meshText.outPutString.Length; i++){vertIndex = vp.GetVert(meshText.outPutString[i]);if (vertIndex == -1){return null;}indexArray.Add(vertIndex);int verticeStartIndex = vertIndex << 2;int triangleStartIndex = vertIndex * 6;CharacterInfo ch;Color c = meshText.colorArray[i] == null ? color : (Color)meshText.colorArray[i];if (!spriteHelper.GetCharacterInfo(meshText.outPutString[i], out ch)){uvNeedRebuild = true;continue;}if ((meshText.outPutString[i] == '暴' || meshText.outPutString[i] == '击') && isCrit){meshText.minX[i] = ch.minX * critScale;meshText.maxX[i] = ch.maxX * critScale;meshText.minY[i] = ch.minY * critScale;meshText.maxY[i] = ch.maxY * critScale;meshText.advance[i] = ch.advance * critScale;}else{meshText.minX[i] = ch.minX;meshText.maxX[i] = ch.maxX;meshText.minY[i] = ch.minY;meshText.maxY[i] = ch.maxY;meshText.advance[i] = ch.advance;}SetVert(verticeStartIndex, pos, meshText.minX[i], meshText.minY[i], meshText.maxX[i], meshText.maxY[i], scale);SetUv(verticeStartIndex, ch);SetColor(verticeStartIndex, c);SetTriangle(triangleStartIndex, verticeStartIndex);pos.x += meshText.advance[i] * scale;}needRefresh = true;if (!m_requireList.ContainsKey(indexArray))m_requireList.Add(indexArray, meshText);return indexArray;}private void SetVert(int index, Vector3 pos, float minX, float minY, float maxX, float maxY, float scale){minX *= scale;maxX *= scale;minY *= scale;maxY *= scale;vertices[index + 1] = SetVertOffsetVector(pos, minX, maxY);vertices[index + 2] = SetVertOffsetVector(pos, maxX, maxY);vertices[index + 3] = SetVertOffsetVector(pos, maxX, minY);vertices[index + 0] = SetVertOffsetVector(pos, minX, minY);}public Vector2 GetTextRect(string showString, float scale, out bool bSuccess, bool isCrit = false){float length = 0;float heigth = 0;bSuccess = true;for (int i = 0; i < showString.Length; i++){CharacterInfo ch;bSuccess = spriteHelper.GetCharacterInfo(showString[i], out ch);if (!bSuccess){break;}if ((showString[i] == '暴' || showString[i] == '击') && isCrit){length += ch.advance * scale * critScale;float fAbsHeight = Mathf.Abs(ch.glyphHeight);heigth = heigth > fAbsHeight ? heigth : fAbsHeight;}else{length += ch.advance * scale;float fAbsHeight = Mathf.Abs(ch.glyphHeight);heigth = heigth > fAbsHeight ? heigth : fAbsHeight;}}m_rectVec.x = length;m_rectVec.y = heigth;return m_rectVec;}public void RefreshVertPos(List<int> vertArray, Vector3 pos, float scale, Color color, float vertAngle = 0){RefreshDynamicPos(vertArray, null, pos, scale, color);}public void ReleaseVert(List<int> vertArray){if (null == vertArray) return;for (int i = 0; i < vertArray.Count; i++){vp.ReleaseVert(vertArray[i]);DrawMesh(vertArray[i] * 4, Rect.zero, Rect.zero, Color.white);}//ListPool<int>.Release(vertArray);if (m_requireList.ContainsKey(vertArray))m_requireList.Remove(vertArray);needRefresh = true;}public List<int> DrawDamage(string showString, Vector3 pos, float scale, Color color, bool isCrit = false){//请有bug修复bug，不要在这里用Replace方式处理文字。以下代码屏蔽@hmz//showString = showString.Replace(" ", "");return DrawDynamicTextUVs(showString, pos, scale, color, 0.1f, isCrit);}
}

简单测试代码

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;public class MyMeshText : MonoBehaviour
{UIMesh mesh;public UnityEngine.UI.Text text;private List<int> m_meshArry = new List<int>();void Start(){mesh = new UIMesh(gameObject, "mymesh", text.font, true, 1024);m_meshArry = mesh.DrawDamage("闪避", new Vector3(978, 529, 0), 0.4f, Color.black, false);}int i = 0; // Update is called once per framevoid Update(){if (null != mesh)mesh.Update();mesh.Show(true);if (Input.GetKeyDown(KeyCode.A)){i += 100;mesh.ReleaseVert(m_meshArry);m_meshArry.Clear();m_meshArry =  mesh.DrawDamage("44444525", new Vector3(978, 529 + i, 0), 0.4f, Color.black, false);}}
}

这样我们只需要对一个Mesh操作就能实现很多伤害飘血。而不需要像之前那样美一条伤害飘血都去创建一个UIText显示。

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