Pass{Cull FrontCGPROGRAM#include "UnityCG.cginc"  #pragma vertex vert  #pragma fragment frag  fixed4 _OutlineCol;float _OutlineFactor;struct v2f{float4 pos : SV_POSITION;};v2f vert(appdata_full v){v2f o;o.pos = UnityObjectToClipPos(v.vertex);float3 vnormal = mul((float3x3)UNITY_MATRIX_IT_MV, v.normal);//正常做法，视空间法线外扩，没考虑到相机的透视问题//float2 offset = TransformViewToProjection(vnormal.xy);//o.pos.xy += offset * _OutlineFactor / 1000;//把clip.w考虑进去，解决相机拉远拉近导致描边殂谢改变的透视问题，以及屏幕宽高比描边不均衡问题(ScreenParam.xy).float2 offset = normalize(clipNormal.xy) / _ScreenParams.xy * _OutlineWidth * o.pos.w * 2;o.pos.xy += offset;return o;}fixed4 frag(v2f i) : SV_Target{return _OutlineCol;}ENDCG  }

         v2f vert(appdata v){v2f o;o.pos = UnityObjectToClipPos(v.vertex);float4 worldPos = mul(unity_ObjectToWorld, v.vertex);float3 worldNormal = UnityObjectToWorldNormal(v.normal);float3 worldTangent = UnityObjectToWorldDir(v.tangent.xyz);float3 worldBitangent = normalize(cross(worldNormal, worldTangent) * v.tangent.w);float3x3 tangentTransform = float3x3(worldTangent, worldBitangent, worldNormal);float3 fixedNormal = UnpackNormalRG(float3(v.uv2, 1.0));fixedNormal = normalize(fixedNormal);float3 worldSpaceFixedNormal = normalize(mul(fixedNormal, tangentTransform));float3 localSpaceNormal = mul((float3x3)unity_WorldToObject, worldSpaceFixedNormal);float3 viewSpaceNormal = mul((float3x3)UNITY_MATRIX_IT_MV, localSpaceNormal);float2 ndcnormal = normalize(mul((float3x3)UNITY_MATRIX_P, viewSpaceNormal).xy) * o.pos.w;o.pos.xy += ndcnormal / _ScreenParams.xy * _OutlineFactor * 2;o.uv = TRANSFORM_TEX(v.uv, _MainTex);return o;}fixed4 frag(v2f i) : SV_Target{return _OutlineCol;}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;public class PluginMeshTools
{[MenuItem("MeshTools/模型平均法线写入UV2数据")]public static void WirteAverageNormalToTangentToos(){MeshFilter[] meshFilters = Selection.activeGameObject.GetComponentsInChildren<MeshFilter>();foreach (var meshFilter in meshFilters){Mesh mesh = meshFilter.sharedMesh;WirteAverageNormalToTangent(mesh);}SkinnedMeshRenderer[] skinMeshRenders = Selection.activeGameObject.GetComponentsInChildren<SkinnedMeshRenderer>();foreach (var skinMeshRender in skinMeshRenders){Mesh mesh = skinMeshRender.sharedMesh;WirteAverageNormalToTangent(mesh);}}private static void WirteAverageNormalToTangent(Mesh mesh){var averageNormalHash = new Dictionary<Vector3, Vector3>();for (var j = 0; j < mesh.vertexCount; j++){if (!averageNormalHash.ContainsKey(mesh.vertices[j])){averageNormalHash.Add(mesh.vertices[j], mesh.normals[j]);}else{averageNormalHash[mesh.vertices[j]] =(averageNormalHash[mesh.vertices[j]] + mesh.normals[j]).normalized;}}var averageNormals = new Vector3[mesh.vertexCount];for (var j = 0; j < mesh.vertexCount; j++){averageNormals[j] = averageNormalHash[mesh.vertices[j]];}var uv2 = new Vector2[mesh.vertexCount];var oriTangents = mesh.tangents;var oriNormals = mesh.normals;var oriBitangent = Vector3.one;for (var j = 0; j < mesh.vertexCount; j++){oriBitangent = (Vector3.Cross(oriNormals[j], oriTangents[j]) * oriTangents[j].w).normalized;//构建tbn矩阵， 默认tbn->切线到模型var tbn = new Matrix4x4( oriTangents[j], oriBitangent, oriNormals[j], Vector4.zero);//旋转矩阵的逆矩阵等于转置矩阵，所以转置tbn，获得其逆矩阵=>模型到切线空间tbn = tbn.transpose;var bakeNormal = tbn.MultiplyVector(averageNormals[j]).normalized;//归一化后写入uv2[j] = new Vector2(bakeNormal.x * 0.5f + 0.5f, bakeNormal.y * 0.5f + 0.5f);}//uv从0开始mesh.SetUVs(2, uv2);}
}

void UnFbx::FFbxImporter::StoreNormalsToVertColor(FbxMesh* mesh)
{//获取layerFbxLayer* layer0 = mesh->GetLayer(0);//依次获取layer中的顶点色、2uv、法线、切线、副法线FbxLayerElementVertexColor* VertColor = layer0->GetVertexColors();FbxLayerElementUV* UV2 = mesh->GetLayer(1)->GetUVs();FbxLayerElementNormal* VertNormal = layer0->GetNormals();FbxLayerElementTangent* VertTangent = layer0->GetTangents();FbxLayerElementBinormal* VertBinomral = layer0->GetBinormals();//逐顶点遍历操作for (int j = 0; j < mesh->GetPolygonVertexCount(); j++){FbxArray<int> SameControlPointsIndex;for (int k = 0; k < mesh->GetPolygonVertexCount(); k++){//将重复的保存下来，代表是同一个顶点if (mesh->GetPolygonVertices()[k] == mesh->GetPolygonVertices()[j]){SameControlPointsIndex.Add(k);}}//去除重复数据FbxArray<FbxVector4> Normals;for (int x = 0; x < SameControlPointsIndex.Size(); x++){FbxVector4 Normal = VertNormal->GetDirectArray()[SameControlPointsIndex[x]];Normals.AddUnique(Normal);}//将所有不同方向的法线加在一起并归一化获得光滑法线FbxVector4 SmoothNormal;for (int n = 0; n < Normals.Size(); n++){SmoothNormal += Normals[n];}SmoothNormal.Normalize();//构建tbn矩阵FbxVector4 Tangent = VertTangent->GetDirectArray()[j];FbxVector4 Normal = VertNormal->GetDirectArray()[j];FbxVector4 Bitangent = VertBinomral->GetDirectArray()[j];//将法线从模型空间转为切线空间FbxVector4 tmpVector;tmpVector = SmoothNormal;tmpVector[0] = Tangent.DotProduct(SmoothNormal);tmpVector[1] = Bitangent.DotProduct(SmoothNormal);tmpVector[2] = Normal.DotProduct(SmoothNormal);tmpVector[3] = 0;SmoothNormal = tmpVector;//找到定点色对应的颜色索引int VertColorIndex = VertColor->GetIndexArray()[j];//将法线数值范围从-1~1处理为0~1后存入RGB通道中，A通道保持//不变，因为其中存放着轮廓线大小信息FbxColor Color;Color.mRed = SmoothNormal[0] * 0.5f + 0.5f;Color.mGreen = SmoothNormal[1] * 0.5f + 0.5f;Color.mBlue = SmoothNormal[2] * 0.5f + 0.5f;Color.mAlpha = VertColor->GetDirectArray()[VertColorIndex].mAlpha;//将颜色写入顶点颜色layer中VertColor->GetDirectArray().SetAt(VertColorIndex, Color);//第二种方案：尝试将数据写入第2套UV，想办法把顶点色留出来用来设置描边的颜色，可惜失败了~~~//具体原因不明，不知道UE在处理2UV的时候做了什么操作，但方法写出来供大家参考if (UV2){int UV2Index = UV2->GetIndexArray()[j];FbxVector2 v2;v2[0] = SmoothNormal[0];v2[1] = SmoothNormal[1];UV2->GetDirectArray().SetAt(UV2Index, v2);}}
}