diff options
Diffstat (limited to 'src/Tracer.cpp')
| -rw-r--r-- | src/Tracer.cpp | 54 |
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 ); |