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authorTiger Wang <ziwei.tiger@hotmail.co.uk>2014-07-18 21:10:51 +0200
committerTiger Wang <ziwei.tiger@hotmail.co.uk>2014-07-18 21:10:51 +0200
commit37140ae57835680d2c4fb3aa365082622d3a150e (patch)
tree89a636c74375b3c9f0fe77b20ecbadc693bd0989 /src/Tracer.cpp
parentMerge branch 'master' of https://github.com/mc-server/MCServer into portals (diff)
parentMonster fixes (diff)
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Diffstat (limited to 'src/Tracer.cpp')
-rw-r--r--src/Tracer.cpp54
1 files changed, 34 insertions, 20 deletions
diff --git a/src/Tracer.cpp b/src/Tracer.cpp
index be42430a5..54b4716e3 100644
--- a/src/Tracer.cpp
+++ b/src/Tracer.cpp
@@ -7,7 +7,7 @@
#include "Entities/Entity.h"
#ifndef _WIN32
- #include <stdlib.h> // abs()
+ #include <stdlib.h>
#endif
@@ -247,7 +247,7 @@ bool cTracer::Trace( const Vector3f & a_Start, const Vector3f & a_Direction, int
// return 1 = hit, other is not hit
int LinesCross(float x0,float y0,float x1,float y1,float x2,float y2,float x3,float y3)
{
- //float linx, liny;
+ // float linx, liny;
float d=(x1-x0)*(y3-y2)-(y1-y0)*(x3-x2);
if (abs(d)<0.001) {return 0;}
@@ -257,8 +257,8 @@ int LinesCross(float x0,float y0,float x1,float y1,float x2,float y2,float x3,fl
float CD=((y0-y2)*(x1-x0)-(x0-x2)*(y1-y0))/d;
if (CD>=0.0 && CD<=1.0)
{
- //linx=x0+AB*(x1-x0);
- //liny=y0+AB*(y1-y0);
+ // linx=x0+AB*(x1-x0);
+ // liny=y0+AB*(y1-y0);
return 1;
}
}
@@ -273,36 +273,50 @@ int LinesCross(float x0,float y0,float x1,float y1,float x2,float y2,float x3,fl
// 2 = the segment lies in the plane
int cTracer::intersect3D_SegmentPlane( const Vector3f & a_Origin, const Vector3f & a_End, const Vector3f & a_PlanePos, const Vector3f & a_PlaneNormal )
{
- Vector3f u = a_End - a_Origin;//a_Ray.P1 - S.P0;
- Vector3f w = a_Origin - a_PlanePos;//S.P0 - Pn.V0;
+ Vector3f u = a_End - a_Origin; // a_Ray.P1 - S.P0;
+ Vector3f w = a_Origin - a_PlanePos; // S.P0 - Pn.V0;
- float D = a_PlaneNormal.Dot( u );//dot(Pn.n, u);
- float N = -(a_PlaneNormal.Dot( w ) );//-dot(a_Plane.n, w);
+ float D = a_PlaneNormal.Dot( u ); // dot(Pn.n, u);
+ float N = -(a_PlaneNormal.Dot( w ) ); // -dot(a_Plane.n, w);
const float EPSILON = 0.0001f;
- if (fabs(D) < EPSILON) { // segment is parallel to plane
- if (N == 0) // segment lies in plane
+ if (fabs(D) < EPSILON)
+ {
+ // segment is parallel to plane
+ if (N == 0)
+ {
+ // segment lies in plane
return 2;
- return 0; // no intersection
+ }
+ return 0; // no intersection
}
+
// they are not parallel
// compute intersect param
float sI = N / D;
if (sI < 0 || sI > 1)
- return 0; // no intersection
+ {
+ return 0; // no intersection
+ }
- //Vector3f I ( a_Ray->GetOrigin() + sI * u );//S.P0 + sI * u; // compute segment intersect point
+ // Vector3f I ( a_Ray->GetOrigin() + sI * u );// S.P0 + sI * u; // compute segment intersect point
RealHit = a_Origin + u * sI;
return 1;
}
+
+
+
+
int cTracer::GetHitNormal(const Vector3f & start, const Vector3f & end, const Vector3i & a_BlockPos)
{
Vector3i SmallBlockPos = a_BlockPos;
char BlockID = m_World->GetBlock( a_BlockPos.x, a_BlockPos.y, a_BlockPos.z );
if( BlockID == E_BLOCK_AIR || IsBlockWater(BlockID))
+ {
return 0;
+ }
Vector3f BlockPos;
BlockPos = Vector3f(SmallBlockPos);
@@ -310,8 +324,8 @@ int cTracer::GetHitNormal(const Vector3f & start, const Vector3f & end, const Ve
Vector3f Look = (end - start);
Look.Normalize();
- float dot = Look.Dot( Vector3f(-1, 0, 0) ); // first face normal is x -1
- if(dot < 0)
+ float dot = Look.Dot( Vector3f(-1, 0, 0) ); // first face normal is x -1
+ if (dot < 0)
{
int Lines = LinesCross( start.x, start.y, end.x, end.y, BlockPos.x, BlockPos.y, BlockPos.x, BlockPos.y + 1 );
if(Lines == 1)
@@ -324,7 +338,7 @@ int cTracer::GetHitNormal(const Vector3f & start, const Vector3f & end, const Ve
}
}
}
- dot = Look.Dot( Vector3f(0, 0, -1) ); // second face normal is z -1
+ dot = Look.Dot( Vector3f(0, 0, -1) ); // second face normal is z -1
if(dot < 0)
{
int Lines = LinesCross( start.z, start.y, end.z, end.y, BlockPos.z, BlockPos.y, BlockPos.z, BlockPos.y + 1 );
@@ -338,7 +352,7 @@ int cTracer::GetHitNormal(const Vector3f & start, const Vector3f & end, const Ve
}
}
}
- dot = Look.Dot( Vector3f(1, 0, 0) ); // third face normal is x 1
+ dot = Look.Dot( Vector3f(1, 0, 0) ); // third face normal is x 1
if(dot < 0)
{
int Lines = LinesCross( start.x, start.y, end.x, end.y, BlockPos.x + 1, BlockPos.y, BlockPos.x + 1, BlockPos.y + 1 );
@@ -352,7 +366,7 @@ int cTracer::GetHitNormal(const Vector3f & start, const Vector3f & end, const Ve
}
}
}
- dot = Look.Dot( Vector3f(0, 0, 1) ); // fourth face normal is z 1
+ dot = Look.Dot( Vector3f(0, 0, 1) ); // fourth face normal is z 1
if(dot < 0)
{
int Lines = LinesCross( start.z, start.y, end.z, end.y, BlockPos.z + 1, BlockPos.y, BlockPos.z + 1, BlockPos.y + 1 );
@@ -366,7 +380,7 @@ int cTracer::GetHitNormal(const Vector3f & start, const Vector3f & end, const Ve
}
}
}
- dot = Look.Dot( Vector3f(0, 1, 0) ); // fifth face normal is y 1
+ dot = Look.Dot( Vector3f(0, 1, 0) ); // fifth face normal is y 1
if(dot < 0)
{
int Lines = LinesCross( start.y, start.x, end.y, end.x, BlockPos.y + 1, BlockPos.x, BlockPos.y + 1, BlockPos.x + 1 );
@@ -380,7 +394,7 @@ int cTracer::GetHitNormal(const Vector3f & start, const Vector3f & end, const Ve
}
}
}
- dot = Look.Dot( Vector3f(0, -1, 0) ); // sixth face normal is y -1
+ dot = Look.Dot( Vector3f(0, -1, 0) ); // sixth face normal is y -1
if(dot < 0)
{
int Lines = LinesCross( start.y, start.x, end.y, end.x, BlockPos.y, BlockPos.x, BlockPos.y, BlockPos.x + 1 );