Mesh模型导出OBJ、STL格式及Windows窗口调用方法

背景：客户想在UG中打开编辑好的模型，UG不支持obj格式。mesh转曲面不太现实，折中取了个STL。

mesh转OBJ格式

设置导出模型的零点,例如设置底面中心为导出模型的零点。

        float offsetX = 0;
        float offsetY = 0;
        float offsetZ = 0;
        float minX = float.MaxValue;
        float maxX = float.MinValue;
        float minY = float.MaxValue;
        float maxY = float.MinValue;
        float minZ = float.MaxValue;
        float maxZ = float.MinValue;   
        foreach (var item in vertices )
        {
   
   
            Vector3 worldPos = trans.TransformPoint(item);
            if (minX > worldPos.x) minX = worldPos.x;
            if (minY > worldPos.y) minY = worldPos.y;
            if (minZ > worldPos.z) minZ = worldPos.z;
            if (maxX < worldPos.x) maxX = worldPos.x;
            if (maxY < worldPos.y) maxY = worldPos.y;
            if (maxZ < worldPos.z) maxZ = worldPos.z;
        }  
        offsetX = (minX + manX) / 2;
        offsetZ = (maxZ + minZ) / 2;
        offsetY = minY;

校验传入路径名称是否带.obj后缀。

   if (!name.Contains(".obj"))
        {
   
   
            name = Path.Combine(name + ".obj");
        }       

验证是否导出成功

  if (!File.Exists(name ))
        {
   
   
            UnityEngine.Debug.LogError("导出失败！");
        }

完整代码

  public static void Export(Transform trans, Mesh mesh, string name)
    {
   
   
        if (mesh == null) return;
        Vector3[] vertices = mesh.vertices;
        Vector3[] normals = mesh.normals;
        int[] triangles = mesh.triangles;
        StringBuilder sb = new StringBuilder();
        float offsetX = 0;
        float offsetY = 0;
        float offsetZ = 0;
        float minX = float.MaxValue;
        float maxX = float.MinValue;
        float minY = float.MaxValue;
        float maxY = float.MinValue;
        float minZ = float.MaxValue;
        float maxZ = float.MinValue;         

        foreach (var item in vertices )
        {
   
   
            Vector3 worldPos = trans.TransformPoint(item);
            if (minX > worldPos.x) minX = worldPos.x;
            if (minY > worldPos.y) minY = worldPos.y;
            if (minZ > worldPos.z) minZ = worldPos.z;
            if (maxX < worldPos.x) maxX = worldPos.x;
            if (maxY < worldPos.y) maxY = worldPos.y;
            if (maxZ < worldPos.z) maxZ = worldPos.z;
        }

        offsetX = minX;
        offsetZ = (maxZ + minZ) / 2;
        offsetY = (minY + maxY) / 2;
       

        //sb.Append("#为模型导出的obj，不带材质\n\n");     
        for (int i = 0; i < vertices.Length; i++)
        {
   
   
            Vector3 worldVertices = trans.TransformPoint(vertices[i]);
            sb.Append("v " + (worldVertices.x - offsetX) + " " + (worldVertices.y - offsetY) + " " + (worldVertices.z - offsetZ) + "\n");
        }
        sb.Append("\n");

        for (int
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