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unitycoder/ExportMeshToOBJ.cs

Created May 27, 2023 12:31
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  1. unitycoder created this gist May 27, 2023.
    55 changes: 55 additions & 0 deletions ExportMeshToOBJ.cs
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,55 @@
    // https://forum.unity.com/threads/export-unity-mesh-to-obj-or-fbx-format.222690/#post-9041305
    using UnityEngine;
    using UnityEditor;
    using System.Collections;
    using System.IO;
    using System.Text;

    public class ExportMeshToOBJ : ScriptableObject
    {
        [MenuItem("GameObject/Export to OBJ")]
        static void ExportToOBJ()
        {
            GameObject obj = Selection.activeObject as GameObject;
            if (obj == null)
            {
                Debug.Log("No object selected.");
                return;
            }

            MeshFilter meshFilter = obj.GetComponent<MeshFilter>();
            if (meshFilter == null)
            {
                Debug.Log("No mesh found in selected GameObject.");
                return;
            }

            string path = EditorUtility.SaveFilePanel("Export OBJ", "", obj.name, "obj");
            Mesh mesh = meshFilter.sharedMesh;
            StringBuilder sb = new StringBuilder();

            foreach(Vector3 v in mesh.vertices)
            {
                sb.Append(string.Format("v {0} {1} {2}\n", v.x, v.y, v.z));
            }
            foreach(Vector3 v in mesh.normals)
            {
                sb.Append(string.Format("vn {0} {1} {2}\n", v.x, v.y, v.z));
            }
            for (int material=0; material < mesh.subMeshCount; material++)
            {
                sb.Append(string.Format("\ng {0}\n", obj.name));
                int[] triangles = mesh.GetTriangles(material);
                for (int i = 0; i < triangles.Length; i += 3)
                {
                    sb.Append(string.Format("f {0}/{0} {1}/{1} {2}/{2}\n",
                    triangles[i] + 1,
                    triangles[i + 1] + 1,
                    triangles[i + 2] + 1));
                }
            }
            StreamWriter writer = new StreamWriter(path);
            writer.Write(sb.ToString());
            writer.Close();
        }
    }