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include/framework/geometry/plane.h

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+/* -----------------------------------------------------------------------------
+	GSFramework
+	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
+----------------------------------------------------------------------------- */
+
+
+#ifndef	__NPLANE__
+#define	__NPLANE__
+
+
+		#include "math/vector.h"
+
+
+namespace GS {
+
+/*!
+	@short	Plane.
+	ax + by + cz + d = 0
+	@author	Emmanuel Julien (ejulien@nworks.fr)
+*/
+
+class	Plane
+{
+		float			d;						///< Distance to origin.
+		Vector4			p, n;					///< Point in plane and normal.
+
+public:
+
+		/// Return plane normal.
+inline	const Vector4	&GetNormal() const
+		{	return n;	}
+
+		/*!
+			@short	Return point distance to plane.
+
+			Distance is signed, positive when the point is in front of the plane,
+			negative otherwise.
+		*/
+inline	float			DistanceToPlane(const Vector4 &p) const
+		{	return p.Dot(n) + d;	}
+
+		/// Set plane from point/normal and an optional transformation matrix.
+		void			Set(const Vector4 *_p, const Vector4 &_n, const Matrix4 * = 0);
+		/// Set plane three vectors and an optional transformation matrix.
+		void			Set(const Vector4 _p[3], const Matrix4 * = 0);
+
+		Plane();
+		Plane(const Vector4 &_p, const Vector4 &_n, const Matrix4 *_m = 0)
+		{	Set(&_p, _n, _m);	}
+};
+
+} // GS
+
+
+#endif	// __NPLANE__