[Unity]meshデータを使ってGLクラスで描画を行う

example.cs

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {

	public GameObject targetGameObject;
	private Mesh mesh;
	private Vector3[] vertices;
	private int[] indices;

	void Start ()
	{
		if (targetGameObject != null) {
			MeshFilter meshFilter = targetGameObject.GetComponent<MeshFilter> ();
			if (meshFilter) {
				mesh = meshFilter.mesh;
			} else {
				SkinnedMeshRenderer skinnedMeshRenderer = targetGameObject.GetComponent<SkinnedMeshRenderer> ();
				if (skinnedMeshRenderer != null) {
					mesh = skinnedMeshRenderer.sharedMesh;
				}
			}
			vertices = mesh.vertices;
			indices = mesh.GetIndices (0);
			Debug.Log ("subMeshCount:" + mesh.subMeshCount);
		}
		Debug.Log ("vertices.Length:" + vertices.Length);
	}
	
	void drawLineTriangle (Vector3[] v)
	{
		for (int i=0; i<3; i++) {
			int j = (i + 0) % 3;
			int k = (i + 1) % 3;
			GL.Vertex3 (v [j].x, v [j].y, v [j].z);	
			GL.Vertex3 (v [k].x, v [k].y, v [k].z);	
		}
	}
	
	void OnPostRender ()
	{
		GL.PushMatrix ();
		GL.LoadOrtho ();
		GL.Color (Color.red);
		Quaternion q = Quaternion.Euler (-30f, 0, 0);
		Vector3 offsetV = new Vector3 (.3f, .3f, 0f);
		float s = 1.0f;
		
		for (int subMeshCount=0; subMeshCount<mesh.subMeshCount; subMeshCount++) {
			Debug.Log ("mesh.GetTopology (subMeshCount):" + mesh.GetTopology (subMeshCount));
			switch (mesh.GetTopology (subMeshCount)) {
			case MeshTopology.Lines:
				GL.Begin (GL.LINES);
				for (int i=0; i<indices.Length/3; i++) {
					Vector3[] v = new Vector3[3];
					v [0] = q * vertices [indices [i * 3 + 0]] + offsetV;
					v [0] *= s;
					v [1] = q * vertices [indices [i * 3 + 1]] + offsetV;
					v [1] *= s;
					v [2] = q * vertices [indices [i * 3 + 2]] + offsetV;
					v [2] *= s;
					drawLineTriangle (v);
				}
				break;
			case MeshTopology.Triangles:
				GL.Begin (GL.TRIANGLES);
				break;
			case MeshTopology.TriangleStrip:
				GL.Begin (GL.TRIANGLE_STRIP);
				Vector3 v;
				for (int i=0; i<indices.Length; i++) {
					v = vertices [indices [i]] * 1f;
					v = q * v + offsetV;
					GL.Vertex3 (v.x, v.y, v.z);
				}
				break;
			}
		}
		GL.End ();
		GL.PopMatrix ();
	}
}