summaryrefslogtreecommitdiffstats
path: root/source/Tracer.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'source/Tracer.cpp')
-rw-r--r--source/Tracer.cpp398
1 files changed, 0 insertions, 398 deletions
diff --git a/source/Tracer.cpp b/source/Tracer.cpp
deleted file mode 100644
index ef136302f..000000000
--- a/source/Tracer.cpp
+++ /dev/null
@@ -1,398 +0,0 @@
-
-#include "Globals.h" // NOTE: MSVC stupidness requires this to be the same across all modules
-
-#include "Tracer.h"
-#include "World.h"
-
-#include "Vector3f.h"
-#include "Vector3i.h"
-#include "Vector3d.h"
-
-#include "Entities/Entity.h"
-
-#ifndef _WIN32
- #include <stdlib.h> // abs()
-#endif
-
-
-
-
-
-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[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);
-}
-
-
-
-
-
-cTracer::~cTracer()
-{
-}
-
-
-
-
-
-float cTracer::SigNum( float a_Num )
-{
- if (a_Num < 0.f) return -1.f;
- if (a_Num > 0.f) return 1.f;
- return 0.f;
-}
-
-
-
-
-
-void cTracer::SetValues(const Vector3f & a_Start, const Vector3f & a_Direction)
-{
- // calculate the direction of the ray (linear algebra)
- dir = a_Direction;
-
- // decide which direction to start walking in
- step.x = (int) SigNum(dir.x);
- step.y = (int) SigNum(dir.y);
- step.z = (int) SigNum(dir.z);
-
- // normalize the direction vector
- 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
- // same but y-direction
- if (dir.x != 0.f)
- {
- tDelta.x = 1 / fabs(dir.x);
- }
- else
- {
- tDelta.x = 0;
- }
- if (dir.y != 0.f)
- {
- tDelta.y = 1 / fabs(dir.y);
- }
- else
- {
- tDelta.y = 0;
- }
- if (dir.z != 0.f)
- {
- tDelta.z = 1 / fabs(dir.z);
- }
- else
- {
- tDelta.z = 0;
- }
-
- // start voxel coordinates
- pos.x = (int)floorf(a_Start.x);
- pos.y = (int)floorf(a_Start.y);
- pos.z = (int)floorf(a_Start.z);
-
- // calculate distance to first intersection in the voxel we start from
- if (dir.x < 0)
- {
- tMax.x = ((float)pos.x - a_Start.x) / dir.x;
- }
- else
- {
- tMax.x = (((float)pos.x + 1) - a_Start.x) / dir.x;
- }
-
- if (dir.y < 0)
- {
- tMax.y = ((float)pos.y - a_Start.y) / dir.y;
- }
- else
- {
- tMax.y = (((float)pos.y + 1) - a_Start.y) / dir.y;
- }
-
- if (dir.z < 0)
- {
- tMax.z = ((float)pos.z - a_Start.z) / dir.z;
- }
- else
- {
- tMax.z = (((float)pos.z + 1) - a_Start.z) / dir.z;
- }
-}
-
-
-
-
-
-bool cTracer::Trace( const Vector3f & a_Start, const Vector3f & a_Direction, int a_Distance, bool a_LineOfSight)
-{
- if ((a_Start.y < 0) || (a_Start.y >= cChunkDef::Height))
- {
- LOGD("%s: Start Y is outside the world (%.2f), not tracing.", __FUNCTION__, a_Start.y);
- return false;
- }
-
- SetValues(a_Start, a_Direction);
-
- Vector3f End = a_Start + (dir * (float)a_Distance);
-
- if (End.y < 0)
- {
- float dist = -a_Start.y / dir.y;
- End = a_Start + (dir * dist);
- }
-
- // end voxel coordinates
- end1.x = (int)floorf(End.x);
- end1.y = (int)floorf(End.y);
- end1.z = (int)floorf(End.z);
-
- // check if first is occupied
- if (pos.Equals(end1))
- {
- return false;
- }
-
- bool reachedX = false, reachedY = false, reachedZ = false;
-
- int Iterations = 0;
- while (Iterations < a_Distance)
- {
- Iterations++;
- if ((tMax.x < tMax.y) && (tMax.x < tMax.z))
- {
- tMax.x += tDelta.x;
- pos.x += step.x;
- }
- else if (tMax.y < tMax.z)
- {
- tMax.y += tDelta.y;
- pos.y += step.y;
- }
- else
- {
- tMax.z += tDelta.z;
- pos.z += step.z;
- }
-
- if (step.x > 0.0f)
- {
- if (pos.x >= end1.x)
- {
- reachedX = true;
- }
- }
- else if (pos.x <= end1.x)
- {
- reachedX = true;
- }
-
- if (step.y > 0.0f)
- {
- if(pos.y >= end1.y)
- {
- reachedY = true;
- }
- }
- else if (pos.y <= end1.y)
- {
- reachedY = true;
- }
-
- if (step.z > 0.0f)
- {
- if (pos.z >= end1.z)
- {
- reachedZ = true;
- }
- }
- else if (pos.z <= end1.z)
- {
- reachedZ = true;
- }
-
- if (reachedX && reachedY && reachedZ)
- {
- 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 && g_BlockIsSolid[BlockID]) || (a_LineOfSight && (BlockID != E_BLOCK_AIR) && !IsBlockWater(BlockID)))
- {
- BlockHitPosition = pos;
- int Normal = GetHitNormal(a_Start, End, pos );
- if(Normal > 0)
- {
- HitNormal = m_NormalTable[Normal-1];
- }
- return true;
- }
- }
- return false;
-}
-
-
-
-
-
-// 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 d=(x1-x0)*(y3-y2)-(y1-y0)*(x3-x2);
- if (abs(d)<0.001) {return 0;}
- float AB=((y0-y2)*(x3-x2)-(x0-x2)*(y3-y2))/d;
- if (AB>=0.0 && AB<=1.0)
- {
- 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);
- return 1;
- }
- }
- return 0;
-}
-
-// intersect3D_SegmentPlane(): intersect a segment and a plane
-// Input: a_Ray = a segment, and a_Plane = a plane = {Point V0; Vector n;}
-// Output: *I0 = the intersect point (when it exists)
-// 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 )
-{
- 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);
-
- const float EPSILON = 0.0001f;
- if (fabs(D) < EPSILON) { // segment is parallel to plane
- if (N == 0) // segment lies in plane
- return 2;
- return 0; // no intersection
- }
- // they are not parallel
- // compute intersect param
- float sI = N / D;
- if (sI < 0 || sI > 1)
- return 0; // no intersection
-
- //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);
-
- Vector3f Look = (end - start);
- Look.Normalize();
-
- 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)
- {
- 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) );
- return 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 );
- 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) );
- return 2;
- }
- }
- }
- 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)
- {
- 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) );
- return 3;
- }
- }
- }
- 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)
- {
- 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) );
- return 4;
- }
- }
- }
- 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)
- {
- 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) );
- return 5;
- }
- }
- }
- 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)
- {
- 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) );
- return 6;
- }
- }
- }
- return 0;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-13 08:09:51 +0200