#ifndef TXS_QUAD_FACE_GUARD
#define TXS_QUAD_FACE_GUARD

#include "TxsFace.h"
#include "BareTri.h"

namespace TXS {

	/*
	 * The special 4-vertice case of TxsFace
	 * The normal TxsFace only should be used for triangles
	 */
	class TxsQuadFace : public TxsFace
	{
		private:

			/*
			 * The four tris that make up this possibly non-planar
			 * quadrilat
			 */
			list<BareTri> slices;

			/*
			 * The average plane - ie. the plane that all the slices project onto
			 */
			TxsVertex *avgVert;

			void calcAvgVert();

			// also calculates this->normal
			void createTriSlices();

			void calcUVPlaneAndBasis();

			void calcUVPlaneBoundaryPlanes();

			/*
			 * This overrides calcEverything in TxsFace
			 * This does:
			 * 	- calcs edge planes
			 * 	- calcs radial planes
			 * 	- sets up UV plane
			 */
			virtual void calcEverything(TXS_REAL unitsPerPixel);
			virtual Plane calcEdgePlane(int iv);

		public:

			TxsQuadFace(vector<TxsVertex*> *verts, TXS_REAL unitsPerPixel) :
			  avgVert(NULL)
			{
				this->verts = *verts;
				this->calcEverything(unitsPerPixel);
			}

			virtual ~TxsQuadFace();

			Point getPointForUV(const UVs &uv);
			bool intersectRay(const Point &s, const Vector &d, Point &intxOut, TXS_REAL &distOut);
			bool getRgbForRay(const Point &s, const Vector &d, int level, NormRGB &rgbOut);
			virtual Vector calcPhongNormalAt(const Point &p);

	};

}

#endif /* TXS_QUAD_FACE_GUARD */