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using System.IO;
using System.Text;
using UnityEngine;
public class RTPObjExporter
{
public static string MeshToString(MeshFilter mf)
{
Mesh sharedMesh = mf.sharedMesh;
Material[] sharedMaterials = mf.GetComponent<Renderer>().sharedMaterials;
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append("g ").Append(mf.name).Append("\n");
Vector3[] vertices = sharedMesh.vertices;
for (int i = 0; i < vertices.Length; i++)
{
Vector3 vector = vertices[i];
stringBuilder.Append($"v {0f - vector.x} {vector.y} {vector.z}\n");
}
stringBuilder.Append("\n");
Vector3[] normals = sharedMesh.normals;
for (int j = 0; j < normals.Length; j++)
{
Vector3 vector2 = normals[j];
stringBuilder.Append($"vn {0f - vector2.x} {vector2.y} {vector2.z}\n");
}
stringBuilder.Append("\n");
Vector2[] uv = sharedMesh.uv;
for (int k = 0; k < uv.Length; k++)
{
Vector3 vector3 = uv[k];
stringBuilder.Append($"vt {vector3.x} {vector3.y}\n");
}
for (int l = 0; l < sharedMesh.subMeshCount; l++)
{
stringBuilder.Append("\n");
stringBuilder.Append("usemtl ").Append(sharedMaterials[l].name).Append("\n");
stringBuilder.Append("usemap ").Append(sharedMaterials[l].name).Append("\n");
int[] triangles = sharedMesh.GetTriangles(l);
for (int m = 0; m < triangles.Length; m += 3)
{
stringBuilder.Append(string.Format("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}\n", triangles[m + 2] + 1, triangles[m + 1] + 1, triangles[m] + 1));
}
}
return stringBuilder.ToString();
}
public static void MeshToFile(MeshFilter mf, string filename)
{
using StreamWriter streamWriter = new StreamWriter(filename);
streamWriter.Write(MeshToString(mf));
}
}
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