1 files changed, 82 insertions, 0 deletions

diff --git a/src/Tracer.h b/src/Tracer.h
new file mode 100644
index 000000000..6c2ab6792
--- /dev/null
+++ b/src/Tracer.h
@@ -0,0 +1,82 @@
+
+#pragma once
+
+#include "Vector3i.h"
+#include "Vector3f.h"
+
+
+
+
+
+// fwd:
+class cWorld;
+
+
+
+
+
+// tolua_begin
+
+class cTracer
+{
+public:
+
+	/// Contains the position of the block that caused the collision
+	Vector3f BlockHitPosition;
+
+	/// Contains which face was hit
+	Vector3f HitNormal;
+
+	/// Contains the exact position where a collision occured. (BlockHitPosition + Offset on block)
+	Vector3f RealHit;
+
+
+	cTracer(cWorld * a_World);
+	~cTracer();
+
+	/// Determines if a collision occures along a line. Returns true if a collision occurs.
+	bool Trace(const Vector3f & a_Start, const Vector3f & a_Direction, int a_Distance)
+	{
+		return Trace(a_Start, a_Direction, a_Distance, false);
+	}
+
+	/// Determines if a collision occures along a line. Returns true if a collision occurs.
+	/// When a_LineOfSight is true, we don't use the standard collision detection rules. Instead we use
+	/// the rules for monster vision. E.g. Only water and air do not block vision.
+	/// a_Distance is the number of iterations (blocks hits) that are tested.
+	bool Trace(const Vector3f & a_Start, const Vector3f & a_Direction, int a_Distance, bool a_LineOfSight);
+
+private:
+
+	/// Preps Tracer object for call of Trace function. Only used internally.
+	void SetValues( const Vector3f & a_Start, const Vector3f & a_Direction );
+
+	/// Calculates where on the block a collision occured, if it does occur
+	/// Returns 0 if no intersection occured
+	/// Returns 1 if an intersection occured at a single point
+	/// Returns 2 if the line segment lies in the plane being checked 
+	int intersect3D_SegmentPlane( const Vector3f & a_Origin, const Vector3f & a_End, const Vector3f & a_PlanePos, const Vector3f & a_PlaneNormal );
+	
+	/// Determines which face on the block a collision occured, if it does occur
+	/// Returns 0 if the block is air, water or no collision occured
+	/// Return 1 through 6 for the following block faces, repectively: -x, -z, x, z, y, -y
+	int GetHitNormal( const Vector3f & start, const Vector3f & end, const Vector3i &  a_BlockPos);
+
+	float SigNum( float a_Num );
+	cWorld* m_World;
+
+	Vector3f m_NormalTable[6];
+
+	Vector3f dir;
+	Vector3f tDelta;
+	Vector3i pos;
+	Vector3i end1;
+	Vector3i step;
+	Vector3f tMax;
+};
+
+// tolua_end
+
+
+
+