I have a working script where I export multiple meshes that are created during runtime into a OBJ file, but each mesh creates a separate file.
Code that is working
private static void ExportToObjImpl(GameObject obj, string writePath)
{
if (obj == null)
{
Debug.Log("No object selected.");
return;
}
if (!obj.TryGetComponent(out MeshFilter meshFilter))
{
Debug.Log("No MeshFilter is found in selected GameObject.", obj);
return;
}
if (meshFilter.sharedMesh == null)
{
Debug.Log("No mesh is found in selected GameObject.", obj);
return;
}
CultureInfo previousCurrentCulture = Thread.CurrentThread.CurrentCulture;
try
{
using StreamWriter writer = new StreamWriter(writePath);
// Set the culture to always being invariant/standard
// this is why the OBJ's were messed up, my CultureInfo formats floats with ',' instead of '.' which is what OBJ uses.
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
writer.Write(GetMeshOBJ(obj.name, meshFilter.sharedMesh, ApplyObjTransformations ? obj.transform.localToWorldMatrix : Matrix4x4.identity));
}
catch (System.Exception e)
{
Debug.LogWarning($"[ExportToObjImpl] An exception occured while exporting selected GameObject : {e.Message}\n{e.StackTrace}", obj);
}
Thread.CurrentThread.CurrentCulture = previousCurrentCulture;
}
public static string GetMeshOBJ(string name, Mesh mesh, Matrix4x4 objTransform)
{
StringBuilder sb = new StringBuilder();
foreach (Vector3 v in mesh.vertices)
{
Vector3 writeV = (objTransform != Matrix4x4.identity && objTransform != default) ? objTransform.MultiplyPoint(v) : v;
sb.Append(string.Format("v {0} {1} {2}\n", writeV.x, writeV.y, writeV.z));
}
// Also export UV's
foreach (Vector3 v in mesh.uv)
{
sb.Append(string.Format("vt {0} {1} {2}\n", v.x, v.y, v.z));
}
foreach (Vector3 v in mesh.normals)
{
sb.Append(string.Format("vn {0} {1} {2}\n", v.x, v.y, v.z));
}
for (int material = 0; material < mesh.subMeshCount; material++)
{
sb.Append(string.Format("\ng {0}\n", name));
int[] triangles = mesh.GetTriangles(material);
for (int i = 0; i < triangles.Length; i += 3)
{
sb.Append(string.Format("f {0}/{0} {1}/{1} {2}/{2}\n",
triangles[i] + 1,
triangles[i + 1] + 1,
triangles[i + 2] + 1));
}
}
return sb.ToString();
}
I wanted to export all the meshes into one file only, but the meshes seem to break
Code that is not working
private static void ExportToObjImpl2(GameObject[] objs, string writePath)
{
if (objs == null)
{
Debug.Log("No object selected.");
return;
}
List<Mesh> meshfilter = new List<Mesh>();
foreach (GameObject obj in objs)
{
meshfilter.Add(obj.GetComponent<MeshFilter>().sharedMesh);
}
Mesh[] meshesArray = meshfilter.ToArray();
CultureInfo previousCurrentCulture = Thread.CurrentThread.CurrentCulture;
try
{
using StreamWriter writer = new StreamWriter(writePath);
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
writer.Write(GetMeshOBJ2(objs, meshesArray, Matrix4x4.identity));
}
catch (System.Exception e)
{
Debug.LogWarning($"[ExportToObjImpl] An exception occured while exporting selected GameObject : {e.Message}\n{e.StackTrace}", objs[0]);
}
Thread.CurrentThread.CurrentCulture = previousCurrentCulture;
}
public static string GetMeshOBJ2(Object[] lines, Mesh[] meshes, Matrix4x4 objTransform)
{
StringBuilder sb = new StringBuilder();
int l = 0;
foreach (Object obj in lines)
{
sb.Append(string.Format("o {0}\n", "Line" + l.ToString()));
foreach (Vector3 v in meshes[l].vertices)
{
Vector3 writeV = (objTransform != Matrix4x4.identity && objTransform != default) ? objTransform.MultiplyPoint(v) : v;
sb.Append(string.Format("v {0} {1} {2}\n", writeV.x, writeV.y, writeV.z));
}
// Also export UV's
foreach (Vector3 v in meshes[l].uv)
{
sb.Append(string.Format("vt {0} {1} {2}\n", v.x, v.y, v.z));
}
foreach (Vector3 v in meshes[l].normals)
{
sb.Append(string.Format("vn {0} {1} {2}\n", v.x, v.y, v.z));
}
for (int material = 0; material < meshes[l].subMeshCount; material++)
{
int[] triangles = meshes[l].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));
}
}
l++;
}
return sb.ToString();
}
The left image is from the first script and the right one from the second
Could anyone help point me in the right direction? Is it a formatting error?
