unity之线框模式

概述

游戏场景有时候需要显示物体的线框模式，这时候有多种方法可以达到效果，这里推荐一种动态绘制物体mesh的方法。

给物体挂载这个线框生成脚本

public class WireframeShader : MonoBehaviour
{public Material wireframeMaterial;private GameObject wireframeObject;private Mesh bakedMesh;bool hasMesh = false;bool isSkinned = false;void Start(){if (wireframeMaterial == null){Debug.LogError("The Wireframe Material field is empty. You must assign the wireframe material!");}if ((GetComponent<MeshFilter>() != null) || (GetComponent<SkinnedMeshRenderer>() != null))        hasMesh = true;if (hasMesh){bakedMesh = new Mesh();wireframeObject = new GameObject("Wireframe");wireframeObject.transform.SetParent(transform);wireframeObject.transform.localPosition = Vector3.zero;wireframeObject.transform.localScale = new Vector3(1, 1, 1);wireframeObject.transform.localRotation = Quaternion.identity;var meshFilter = GetComponent<MeshFilter>();if (meshFilter == null)isSkinned = true;if (isSkinned){var skinnedMeshRenderer = GetComponent<SkinnedMeshRenderer>();bakedMesh = BakeMesh(skinnedMeshRenderer.sharedMesh);var wireframeRenderer = wireframeObject.AddComponent<SkinnedMeshRenderer>();wireframeRenderer.bones = skinnedMeshRenderer.bones;wireframeRenderer.sharedMesh = bakedMesh;wireframeRenderer.material = wireframeMaterial;}else{				bakedMesh = BakeMesh(meshFilter.sharedMesh);wireframeObject.AddComponent<MeshRenderer>();wireframeObject.AddComponent<MeshFilter>();wireframeObject.GetComponent<MeshFilter>().sharedMesh = bakedMesh;wireframeObject.GetComponent<MeshRenderer>().material = wireframeMaterial;}}else{Debug.LogError(name + " does not have a mesh!");}}private Mesh BakeMesh(Mesh originalMesh){var maxVerts = 2147483647;var meshNor = originalMesh.normals;var meshTris = originalMesh.triangles;var meshVerts = originalMesh.vertices;		var boneW = originalMesh.boneWeights;		var vertsNeeded = meshTris.Length;if (vertsNeeded > maxVerts){	Debug.LogError("The mesh has so many vertices that Unity could not create it!");return null;}var resultMesh = new Mesh();resultMesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;		var resultVerts = new Vector3[vertsNeeded];var resultUVs = new Vector2[vertsNeeded];var resultTris = new int[meshTris.Length];var resultNor = new Vector3[vertsNeeded];var boneWLen = (boneW.Length > 0) ? vertsNeeded : 0;var resultBW = new BoneWeight[boneWLen]; for (var i = 0; i < meshTris.Length; i+=3){resultVerts[i] = meshVerts[meshTris[i]];resultVerts[i+1] = meshVerts[meshTris[i+1]];resultVerts[i+2] = meshVerts[meshTris[i+2]];		resultUVs[i] = new Vector2(0f,0f);resultUVs[i+1] = new Vector2(1f,0f);resultUVs[i+2] = new Vector2(0f,1f);resultTris[i] = i;resultTris[i+1] = i+1;resultTris[i+2] = i+2;resultNor[i] = meshNor[meshTris[i]];resultNor[i+1] = meshNor[meshTris[i+1]];resultNor[i+2] = meshNor[meshTris[i+2]];if (resultBW.Length > 0){resultBW[i] = boneW[meshTris[i]];resultBW[i+1] = boneW[meshTris[i+1]];resultBW[i+2] = boneW[meshTris[i+2]];}}resultMesh.vertices = resultVerts;resultMesh.uv = resultUVs;resultMesh.triangles = resultTris;resultMesh.normals = resultNor;resultMesh.bindposes = originalMesh.bindposes;resultMesh.boneWeights = resultBW;return resultMesh;}}