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-rw-r--r--src/Tracer.cpp150
1 files changed, 84 insertions, 66 deletions
diff --git a/src/Tracer.cpp b/src/Tracer.cpp
index 6da6b2ad7..756147a7b 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
@@ -18,11 +18,11 @@ cTracer::cTracer(cWorld * a_World)
: m_World(a_World)
{
m_NormalTable[0].Set(-1, 0, 0);
- m_NormalTable[1].Set( 0, 0,-1);
+ m_NormalTable[1].Set( 0, 0, -1);
m_NormalTable[2].Set( 1, 0, 0);
m_NormalTable[3].Set( 0, 0, 1);
m_NormalTable[4].Set( 0, 1, 0);
- m_NormalTable[5].Set( 0,-1, 0);
+ m_NormalTable[5].Set( 0, -1, 0);
}
@@ -37,7 +37,7 @@ cTracer::~cTracer()
-float cTracer::SigNum( float a_Num )
+float cTracer::SigNum( float a_Num)
{
if (a_Num < 0.f) return -1.f;
if (a_Num > 0.f) return 1.f;
@@ -59,7 +59,7 @@ void cTracer::SetValues(const Vector3f & a_Start, const Vector3f & a_Direction)
step.z = (int) SigNum(dir.z);
// normalize the direction vector
- if( dir.SqrLength() > 0.f ) dir.Normalize();
+ if (dir.SqrLength() > 0.f) dir.Normalize();
// how far we must move in the ray direction before
// we encounter a new voxel in x-direction
@@ -192,7 +192,7 @@ bool cTracer::Trace( const Vector3f & a_Start, const Vector3f & a_Direction, int
if (step.y > 0.0f)
{
- if(pos.y >= end1.y)
+ if (pos.y >= end1.y)
{
reachedY = true;
}
@@ -219,14 +219,18 @@ bool cTracer::Trace( const Vector3f & a_Start, const Vector3f & a_Direction, int
return false;
}
+ if ((pos.y < 0) || (pos.y >= cChunkDef::Height))
+ {
+ return false;
+ }
BLOCKTYPE BlockID = m_World->GetBlock(pos.x, pos.y, pos.z);
// Block is counted as a collision if we are not doing a line of sight and it is solid,
// or if the block is not air and not water. That way mobs can still see underwater.
if ((!a_LineOfSight && cBlockInfo::IsSolid(BlockID)) || (a_LineOfSight && (BlockID != E_BLOCK_AIR) && !IsBlockWater(BlockID)))
{
BlockHitPosition = pos;
- int Normal = GetHitNormal(a_Start, End, pos );
- if(Normal > 0)
+ int Normal = GetHitNormal(a_Start, End, pos);
+ if (Normal > 0)
{
HitNormal = m_NormalTable[Normal-1];
}
@@ -241,9 +245,9 @@ 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)
+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;}
@@ -253,8 +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;
}
}
@@ -267,38 +271,52 @@ int LinesCross(float x0,float y0,float x1,float y1,float x2,float y2,float x3,fl
// Return: 0 = disjoint (no intersection)
// 1 = intersection in the unique point *I0
// 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 )
+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 );
+ char BlockID = m_World->GetBlock( a_BlockPos.x, a_BlockPos.y, a_BlockPos.z);
- if( BlockID == E_BLOCK_AIR || IsBlockWater(BlockID))
+ if (BlockID == E_BLOCK_AIR || IsBlockWater(BlockID))
+ {
return 0;
+ }
Vector3f BlockPos;
BlockPos = Vector3f(SmallBlockPos);
@@ -306,86 +324,86 @@ 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)
+ int Lines = LinesCross( start.x, start.y, end.x, end.y, BlockPos.x, BlockPos.y, BlockPos.x, BlockPos.y + 1);
+ if (Lines == 1)
{
- Lines = LinesCross( start.x, start.z, end.x, end.z, BlockPos.x, BlockPos.z, BlockPos.x, BlockPos.z + 1 );
- if(Lines == 1)
+ Lines = LinesCross( start.x, start.z, end.x, end.z, BlockPos.x, BlockPos.z, BlockPos.x, BlockPos.z + 1);
+ if (Lines == 1)
{
- intersect3D_SegmentPlane( start, end, BlockPos, Vector3f(-1, 0, 0) );
+ intersect3D_SegmentPlane( start, end, BlockPos, Vector3f(-1, 0, 0));
return 1;
}
}
}
- dot = Look.Dot( Vector3f(0, 0, -1) ); // second face normal is z -1
- if(dot < 0)
+ 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 );
- if(Lines == 1)
+ int Lines = LinesCross( start.z, start.y, end.z, end.y, BlockPos.z, BlockPos.y, BlockPos.z, BlockPos.y + 1);
+ if (Lines == 1)
{
- Lines = LinesCross( start.z, start.x, end.z, end.x, BlockPos.z, BlockPos.x, BlockPos.z, BlockPos.x + 1 );
- if(Lines == 1)
+ Lines = LinesCross( start.z, start.x, end.z, end.x, BlockPos.z, BlockPos.x, BlockPos.z, BlockPos.x + 1);
+ if (Lines == 1)
{
- intersect3D_SegmentPlane( start, end, BlockPos, Vector3f(0, 0, -1) );
+ intersect3D_SegmentPlane( start, end, BlockPos, Vector3f(0, 0, -1));
return 2;
}
}
}
- dot = Look.Dot( Vector3f(1, 0, 0) ); // third face normal is x 1
- if(dot < 0)
+ 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 );
- if(Lines == 1)
+ int Lines = LinesCross( start.x, start.y, end.x, end.y, BlockPos.x + 1, BlockPos.y, BlockPos.x + 1, BlockPos.y + 1);
+ if (Lines == 1)
{
- Lines = LinesCross( start.x, start.z, end.x, end.z, BlockPos.x + 1, BlockPos.z, BlockPos.x + 1, BlockPos.z + 1 );
- if(Lines == 1)
+ Lines = LinesCross( start.x, start.z, end.x, end.z, BlockPos.x + 1, BlockPos.z, BlockPos.x + 1, BlockPos.z + 1);
+ if (Lines == 1)
{
- intersect3D_SegmentPlane( start, end, BlockPos + Vector3f(1, 0, 0), Vector3f(1, 0, 0) );
+ intersect3D_SegmentPlane( start, end, BlockPos + Vector3f(1, 0, 0), Vector3f(1, 0, 0));
return 3;
}
}
}
- dot = Look.Dot( Vector3f(0, 0, 1) ); // fourth face normal is z 1
- if(dot < 0)
+ 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 );
- if(Lines == 1)
+ int Lines = LinesCross( start.z, start.y, end.z, end.y, BlockPos.z + 1, BlockPos.y, BlockPos.z + 1, BlockPos.y + 1);
+ if (Lines == 1)
{
- Lines = LinesCross( start.z, start.x, end.z, end.x, BlockPos.z + 1, BlockPos.x, BlockPos.z + 1, BlockPos.x + 1 );
- if(Lines == 1)
+ Lines = LinesCross( start.z, start.x, end.z, end.x, BlockPos.z + 1, BlockPos.x, BlockPos.z + 1, BlockPos.x + 1);
+ if (Lines == 1)
{
- intersect3D_SegmentPlane( start, end, BlockPos + Vector3f(0, 0, 1), Vector3f(0, 0, 1) );
+ intersect3D_SegmentPlane( start, end, BlockPos + Vector3f(0, 0, 1), Vector3f(0, 0, 1));
return 4;
}
}
}
- dot = Look.Dot( Vector3f(0, 1, 0) ); // fifth face normal is y 1
- if(dot < 0)
+ 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 );
- if(Lines == 1)
+ int Lines = LinesCross( start.y, start.x, end.y, end.x, BlockPos.y + 1, BlockPos.x, BlockPos.y + 1, BlockPos.x + 1);
+ if (Lines == 1)
{
- Lines = LinesCross( start.y, start.z, end.y, end.z, BlockPos.y + 1, BlockPos.z, BlockPos.y + 1, BlockPos.z + 1 );
- if(Lines == 1)
+ Lines = LinesCross( start.y, start.z, end.y, end.z, BlockPos.y + 1, BlockPos.z, BlockPos.y + 1, BlockPos.z + 1);
+ if (Lines == 1)
{
- intersect3D_SegmentPlane( start, end, BlockPos + Vector3f(0, 1, 0), Vector3f(0, 1, 0) );
+ intersect3D_SegmentPlane( start, end, BlockPos + Vector3f(0, 1, 0), Vector3f(0, 1, 0));
return 5;
}
}
}
- dot = Look.Dot( Vector3f(0, -1, 0) ); // sixth face normal is y -1
- if(dot < 0)
+ 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 );
- if(Lines == 1)
+ int Lines = LinesCross( start.y, start.x, end.y, end.x, BlockPos.y, BlockPos.x, BlockPos.y, BlockPos.x + 1);
+ if (Lines == 1)
{
- Lines = LinesCross( start.y, start.z, end.y, end.z, BlockPos.y, BlockPos.z, BlockPos.y, BlockPos.z + 1 );
- if(Lines == 1)
+ Lines = LinesCross( start.y, start.z, end.y, end.z, BlockPos.y, BlockPos.z, BlockPos.y, BlockPos.z + 1);
+ if (Lines == 1)
{
- intersect3D_SegmentPlane( start, end, BlockPos, Vector3f(0, -1, 0) );
+ intersect3D_SegmentPlane( start, end, BlockPos, Vector3f(0, -1, 0));
return 6;
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-07 19:53:24 +0100