VertexType vertex;
		Vector3 tangent;
		Vector3 bitangent;
		for (int i = 0; i < mesh.second.vertices.size(); i++)
		{

			vertex.positon = mesh.second.vertices[i];
			vertex.normal = mesh.second.normals[i];
			vertex.texture = mesh.second.uvs[i];

			//Calculate tangent and bitangent

			if (i == 0 || i % 3 == 0)
			{
				Vector3 p0 = mesh.second.vertices[i];
				Vector3 p1 = mesh.second.vertices[i + 1];
				Vector3 p2 = mesh.second.vertices[i + 2];

				Vector2 uv0 = vertex.texture = mesh.second.uvs[i];
				Vector2 uv1 = vertex.texture = mesh.second.uvs[i + 1];
				Vector2 uv2 = vertex.texture = mesh.second.uvs[i + 2];

				Vector3 dv1 = p1 - p0;
				Vector3 dv2 = p2 - p0;

				Vector2 duv1 = uv1 - uv0;
				Vector2 duv2 = uv2 - uv0;

				float r = 1.0f / (duv1.x * duv2.y - duv1.y * duv2.x);
				tangent = (dv1 * duv2.y - dv2 * duv1.y)*r;
				bitangent = (dv2 * duv1.x - dv1 * duv2.x)*r;


			}
			vertex.tangent = tangent;
			vertex.bitangent = bitangent;

			vertices.push_back(vertex);
		}