using UnityEngine;
using texturetk;

[RequireComponent(typeof(MeshFilter))]
public class uvexporter : MonoBehaviour {

	[ContextMenu("Export to file")]
	void ExportUVs () {
		// Load the mesh
		Mesh m = gameObject.GetComponent<MeshFilter> ().sharedMesh;
		int[] tris = m.triangles;
		Vector2[] uvs = m.uv;
		// Create the texture to draw the uv map on
		int w = 1024;
		int h = 1024;
		Texture2D tex = new Texture2D(w, h);
		// Draw the uv map lines on the texture
		for (int i=0;i<tris.Length;i+=3){
			Vector2 pt1 = uvs[tris[i]];
			Vector2 pt2 = uvs[tris[i+1]];
			Vector2 pt3 = uvs[tris[i+2]];
			TextureTools.DrawLine(tex, (int)(pt1.x*w), (int)(pt1.y*h), (int)(pt2.x*w), (int)(pt2.y*h), Color.red);
			TextureTools.DrawLine(tex, (int)(pt2.x*w), (int)(pt2.y*h), (int)(pt3.x*w), (int)(pt3.y*h), Color.red);
			TextureTools.DrawLine(tex, (int)(pt3.x*w), (int)(pt3.y*h), (int)(pt1.x*w), (int)(pt1.y*h), Color.red);
		}
		tex.Apply();
		// Save the texture with exported uvs
		string path = Application.dataPath + "/exporteduvs.png";
		Debug.Log ("Exporting uvs to "+path);
		TextureTools.SaveTexture(tex, path);
	}
}