86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
|
|
#pragma once
|
|
|
|
#include "Vector3.h"
|
|
|
|
#include <array>
|
|
|
|
|
|
|
|
|
|
|
|
// 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);
|
|
|
|
/// Signum function
|
|
int SigNum(float a_Num);
|
|
|
|
cWorld * m_World;
|
|
|
|
static const std::array<const Vector3f, 6> & m_NormalTable(void);
|
|
|
|
Vector3f dir;
|
|
Vector3f tDelta;
|
|
Vector3i pos;
|
|
Vector3i end1;
|
|
Vector3i step;
|
|
Vector3f tMax;
|
|
};
|
|
|
|
// tolua_end
|
|
|
|
|
|
|
|
|