static int All_Box_Intersections(OBJECT *Object, RAY *Ray, ISTACK *Depth_Stack)
{
int Intersection_Found;
int Side1, Side2;
DBL Depth1, Depth2;
VECTOR IPoint;
Increase_Counter(stats[Ray_Box_Tests]);
Intersection_Found = false;
if (Intersect_Box(Ray, ((BOX *)Object)->Trans, ((BOX *)Object)->bounds[0], ((BOX *)Object)->bounds[1], &Depth1, &Depth2, &Side1, &Side2))
{
if (Depth1 > DEPTH_TOLERANCE)
{
VEvaluateRay(IPoint, Ray->Initial, Depth1, Ray->Direction);
if (Point_In_Clip(IPoint, Object->Clip))
{
push_entry_i1(Depth1,IPoint,Object,Side1,Depth_Stack);
Intersection_Found = true;
}
}
VEvaluateRay(IPoint, Ray->Initial, Depth2, Ray->Direction);
if (Point_In_Clip(IPoint, Object->Clip))
{
push_entry_i1(Depth2,IPoint,Object,Side2,Depth_Stack);
Intersection_Found = true;
}
}
if (Intersection_Found)
{
Increase_Counter(stats[Ray_Box_Tests_Succeeded]);
}
return (Intersection_Found);
}
int All_Parametric_Intersections(OBJECT* Object, RAY* Ray, ISTACK* Depth_Stack)
{
PARAMETRIC * Par = (PARAMETRIC *)Object;
PRECOMP_PAR_DATA * PData = ((PARAMETRIC *)Object)->PData;
VECTOR P, D, IPoint;
UV_VECT low_vect, hi_vect;
RAY New_Ray;
DBL XRayMin, XRayMax, YRayMin, YRayMax, ZRayMin, ZRayMax, TPotRes, TLen;
DBL Depth1, Depth2, temp, Len, UResult, VResult, TResult = HUGE_VAL;
DBL low, hi, len;
int MaxPrecompX, MaxPrecompY, MaxPrecompZ;
int split, i = 0, Side1, Side2;
int parX, parY;
int i_flg;
Increase_Counter(stats[Ray_Par_Bound_Tests]);
if(Par->container_shape)
{
if(Par->Trans != NULL)
{
MInvTransPoint(New_Ray.Initial, Ray->Initial, Par->Trans);
MInvTransDirection(New_Ray.Direction, Ray->Direction, Par->Trans);
VLength(len, New_Ray.Direction);
VInverseScaleEq(New_Ray.Direction, len);
i_flg = Intersect_Sphere(&New_Ray, Par->container.sphere.center,
(Par->container.sphere.radius) * (Par->container.sphere.radius),
&Depth1, &Depth2);
Depth1 = Depth1 / len;
Depth2 = Depth2 / len;
}
else
{
i_flg = Intersect_Sphere(Ray, Par->container.sphere.center,
(Par->container.sphere.radius) * (Par->container.sphere.radius), &Depth1, &Depth2);
}
Decrease_Counter(stats[Ray_Sphere_Tests]);
if(i_flg)
Decrease_Counter(stats[Ray_Sphere_Tests_Succeeded]);
}
else
{
i_flg = Intersect_Box(Ray, Par->Trans, Par->container.box.corner1, Par->container.box.corner2,
&Depth1, &Depth2, &Side1, &Side2);
}
if(!i_flg)
return false;
Increase_Counter(stats[Ray_Par_Bound_Tests_Succeeded]);
Increase_Counter(stats[Ray_Parametric_Tests]);
if (Par->Trans != NULL)
{
MInvTransPoint(P, Ray->Initial, Par->Trans);
MInvTransDirection(D, Ray->Direction, Par->Trans);
}
else
{
P[X] = Ray->Initial[X];
P[Y] = Ray->Initial[Y];
P[Z] = Ray->Initial[Z];
D[X] = Ray->Direction[X];
D[Y] = Ray->Direction[Y];
D[Z] = Ray->Direction[Z];
}
if (Depth1 == Depth2)
Depth1 = 0;
if ((Depth1 += 4 * Par->accuracy) > Depth2)
return false;
Intervals_Low[INDEX_U][0] = Par->umin;
Intervals_Hi[INDEX_U][0] = Par->umax;
Intervals_Low[INDEX_V][0] = Par->vmin;
Intervals_Hi[INDEX_V][0] = Par->vmax;
/* Fri 09-27-1996 0. */
SectorNum[0] = 1;
MaxPrecompX = MaxPrecompY = MaxPrecompZ = 0;
if (PData != NULL)
{
if (((PData->flags) & OK_X) != 0)
MaxPrecompX = 1 << (PData->depth);
if (((PData->flags) & OK_Y) != 0)
MaxPrecompY = 1 << (PData->depth);
if (((PData->flags) & OK_Z) != 0)
MaxPrecompZ = 1 << (PData->depth);
}
/* 0 */
while (i >= 0)
{
low_vect[U] = Intervals_Low[INDEX_U][i];
hi_vect[U] = Intervals_Hi[INDEX_U][i];
Len = hi_vect[U] - low_vect[U];
split = INDEX_U;
low_vect[V] = Intervals_Low[INDEX_V][i];
hi_vect[V] = Intervals_Hi[INDEX_V][i];
temp = hi_vect[V] - low_vect[V];
if (temp > Len)
{
Len = temp;
split = INDEX_V;
}
parX = parY = 0;
TLen = 0;
/* X */
if (SectorNum[i] < MaxPrecompX)
{
low = PData->Low[0][SectorNum[i]];
hi = PData->Hi[0][SectorNum[i]];
}
else
Evaluate_Function_Interval_UV(*(Par->Function[0]), Par->accuracy, low_vect, hi_vect, Par->max_gradient, low, hi);
/* fabs(D[X] *(T2-T1)) is not OK with new method */
if (close(D[0], 0))
{
parX = 1;
if ((hi < P[0]) || (low > P[0]))
{
i--;
continue;
}
}
else
{
XRayMin = (hi - P[0]) / D[0];
XRayMax = (low - P[0]) / D[0];
if (XRayMin > XRayMax)
{
temp = XRayMin;
XRayMin = XRayMax;
XRayMax = temp;
}
if ((XRayMin > Depth2) || (XRayMax < Depth1))
{
i--;
continue;
}
if ((TPotRes = XRayMin) > TResult)
{
i--;
continue;
}
TLen = XRayMax - XRayMin;
}
/* Y */
if (SectorNum[i] < MaxPrecompY)
{
low = PData->Low[1][SectorNum[i]];
hi = PData->Hi[1][SectorNum[i]];
}
else
Evaluate_Function_Interval_UV(*(Par->Function[1]), Par->accuracy, low_vect, hi_vect, Par->max_gradient, low, hi);
if (close(D[1], 0))
{
parY = 1;
if ((hi < P[1]) || (low > P[1]))
{
i--;
continue;
}
}
else
{
YRayMin = (hi - P[1]) / D[1];
YRayMax = (low - P[1]) / D[1];
if (YRayMin > YRayMax)
{
temp = YRayMin;
YRayMin = YRayMax;
YRayMax = temp;
}
if ((YRayMin > Depth2) || (YRayMax < Depth1))
{
i--;
continue;
}
if ((TPotRes = YRayMin) > TResult)
{
i--;
continue;
}
if (parX == 0)
{
if ((YRayMin > XRayMax) || (YRayMax < XRayMin))
{
i--;
continue;
}
}
if ((temp = YRayMax - YRayMin) > TLen)
TLen = temp;
}
/* Z */
if ((SectorNum[i] < MaxPrecompZ) && (0 < SectorNum[i]))
{
low = PData->Low[2][SectorNum[i]];
hi = PData->Hi[2][SectorNum[i]];
}
else
Evaluate_Function_Interval_UV(*(Par->Function[2]), Par->accuracy, low_vect, hi_vect, Par->max_gradient, low, hi);
if (close(D[2], 0))
{
if ((hi < P[2]) || (low > P[2]))
{
i--;
continue;
}
}
else
{
ZRayMin = (hi - P[2]) / D[2];
ZRayMax = (low - P[2]) / D[2];
if (ZRayMin > ZRayMax)
{
temp = ZRayMin;
ZRayMin = ZRayMax;
ZRayMax = temp;
}
if ((ZRayMin > Depth2) || (ZRayMax < Depth1))
{
i--;
continue;
}
if ((TPotRes = ZRayMin) > TResult)
{
i--;
continue;
}
if (parX == 0)
{
if ((ZRayMin > XRayMax) || (ZRayMax < XRayMin))
{
i--;
continue;
}
}
if (parY == 0)
{
if ((ZRayMin > YRayMax) || (ZRayMax < YRayMin))
{
i--;
continue;
}
}
if ((temp = ZRayMax - ZRayMin) > TLen)
TLen = temp;
}
if (Len > TLen)
Len = TLen;
if (Len < Par->accuracy)
{
if ((TResult > TPotRes) && (TPotRes > Depth1))
{
TResult = TPotRes;
Par->last_u = UResult = low_vect[U];
Par->last_v = VResult = low_vect[V];
}
i--;
}
else
{
/* 1 copy */
if ((SectorNum[i] *= 2) >= Max_intNumber)
SectorNum[i] = Max_intNumber;
SectorNum[i + 1] = SectorNum[i];
SectorNum[i]++;
i++;
Intervals_Low[INDEX_U][i] = low_vect[U];
Intervals_Hi[INDEX_U][i] = hi_vect[U];
Intervals_Low[INDEX_V][i] = low_vect[V];
Intervals_Hi[INDEX_V][i] = hi_vect[V];
/* 2 split */
temp = (Intervals_Hi[split][i] + Intervals_Low[split][i]) / 2.0;
Intervals_Hi[split][i] = temp;
Intervals_Low[split][i - 1] = temp;
}
}
if (TResult < Depth2)
{
Increase_Counter(stats[Ray_Parametric_Tests_Succeeded]);
VScale(IPoint, Ray->Direction, TResult);
VAddEq(IPoint, Ray->Initial);
if (Point_In_Clip(IPoint, Par->Clip))
{
/*
compute_param_normal( Par, UResult, VResult , &N);
push_normal_entry( TResult ,IPoint, N, (OBJECT *) Object, Depth_Stack);
*/
// UV_VECT uv;
// Make_UV_Vector(uv, UResult, VResult);
// push_uv_entry(TResult, IPoint, uv, (OBJECT *)Object, Depth_Stack);
push_entry(TResult, IPoint, (OBJECT *)Object, Depth_Stack);
return true;
}
}
return false;
}
static int All_IsoSurface_Intersections(OBJECT* Object, RAY* Ray, ISTACK* Depth_Stack)
{
ISOSURFACE * Isosrf = (ISOSURFACE *)Object;
int Side1 = 0, Side2 = 0, itrace = 0, i_flg = 0;
DBL Depth1 = 0.0, Depth2 = 0.0, len = 0.0;
RAY New_Ray;
VECTOR IPoint;
VECTOR P, D;
DBL tmax = 0.0, tmin = 0.0, tmp = 0.0;
int i = 0 ; /* count of intervals in stack - 1 */
int IFound = false;
int begin = 0, end = 0;
bool in_shadow_test = false;
VECTOR VTmp;
Increase_Counter(stats[Ray_IsoSurface_Bound_Tests]);
in_shadow_test = ((Ray->Optimisiation_Flags & OPTIMISE_SHADOW_TEST) == OPTIMISE_SHADOW_TEST);
if(Isosrf->container_shape)
{
if(Isosrf->Trans != NULL)
{
MInvTransPoint(New_Ray.Initial, Ray->Initial, Isosrf->Trans);
MInvTransDirection(New_Ray.Direction, Ray->Direction, Isosrf->Trans);
VLength(len, New_Ray.Direction);
VInverseScaleEq(New_Ray.Direction, len);
i_flg = Intersect_Sphere(&New_Ray, Isosrf->container.sphere.center,
(Isosrf->container.sphere.radius) * (Isosrf->container.sphere.radius),
&Depth1, &Depth2);
Depth1 = Depth1 / len;
Depth2 = Depth2 / len;
}
else
{
i_flg = Intersect_Sphere(Ray, Isosrf->container.sphere.center,
(Isosrf->container.sphere.radius) * (Isosrf->container.sphere.radius), &Depth1, &Depth2);
}
Decrease_Counter(stats[Ray_Sphere_Tests]);
if(i_flg)
Decrease_Counter(stats[Ray_Sphere_Tests_Succeeded]);
}
else
{
i_flg = Intersect_Box(Ray, Isosrf->Trans, Isosrf->container.box.corner1, Isosrf->container.box.corner2,
&Depth1, &Depth2, &Side1, &Side2);
}
if(Depth1 < 0.0)
Depth1 = 0.0;
if(i_flg) /* IsoSurface_Bound_Tests */
{
Increase_Counter(stats[Ray_IsoSurface_Bound_Tests_Succeeded]);
if(Isosrf->Trans != NULL)
{
MInvTransPoint(P, Ray->Initial, Isosrf->Trans);
MInvTransDirection(D, Ray->Direction, Isosrf->Trans);
}
else
{
Assign_Vector(P, Ray->Initial);
Assign_Vector(D, Ray->Direction);
}
Isosrf->Inv3 = 1;
if(Isosrf->closed != false)
{
VEvaluateRay(VTmp, P, Depth1, D);
tmp = Vector_IsoSurface_Function(Isosrf, VTmp);
if(Depth1 > Isosrf->accuracy)
{
if(tmp < 0.0) /* The ray hits the bounding shape */
{
VEvaluateRay(IPoint, Ray->Initial, Depth1, Ray->Direction);
if(Point_In_Clip(IPoint, Object->Clip))
{
push_entry_i1(Depth1, IPoint, Object, Side1, Depth_Stack);
IFound = true;
itrace++;
Isosrf->Inv3 *= -1;
}
}
}
else
{
if(tmp < (Isosrf->max_gradient * Isosrf->accuracy * 4.0))
{
Depth1 = Isosrf->accuracy * 5.0;
VEvaluateRay(VTmp, P, Depth1, D);
if(Vector_IsoSurface_Function(Isosrf, VTmp) < 0)
Isosrf->Inv3 = -1;
/* Change the sign of the function (IPoint is in the bounding shpae.)*/
}
VEvaluateRay(VTmp, P, Depth2, D);
if(Vector_IsoSurface_Function(Isosrf, VTmp) < 0.0)
{
VEvaluateRay(IPoint, Ray->Initial, Depth2, Ray->Direction);
if(Point_In_Clip(IPoint, Object->Clip))
{
push_entry_i1(Depth2, IPoint, Object, Side2, Depth_Stack);
IFound = true;
}
}
}
}
/* METHOD 2 by R. Suzuki */
tmax = Depth2 = min(Depth2, BOUND_HUGE);
tmin = Depth1 = min(Depth2, Depth1);
if((tmax - tmin) < Isosrf->accuracy)
return (false);
Increase_Counter(stats[Ray_IsoSurface_Tests]);
if((Depth1 < Isosrf->accuracy) && (Isosrf->Inv3 == 1))
{
/* IPoint is on the isosurface */
VEvaluateRay(VTmp, P, tmin, D);
if(fabs(Vector_IsoSurface_Function(Isosrf, VTmp)) < (Isosrf->max_gradient * Isosrf->accuracy * 4.0))
{
tmin = Isosrf->accuracy * 5.0;
VEvaluateRay(VTmp, P, tmin, D);
if(Vector_IsoSurface_Function(Isosrf, VTmp) < 0)
Isosrf->Inv3 = -1;
/* change the sign and go into the isosurface */
}
}
for (; itrace < Isosrf->max_trace; itrace++)
{
if(IsoSurface_Function_Find_Root(Isosrf, P, D, &tmin, &tmax, in_shadow_test) == false)
break;
else
{
VEvaluateRay(IPoint, Ray->Initial, tmin, Ray->Direction);
if(Point_In_Clip(IPoint, Object->Clip))
{
push_entry_i1(tmin, IPoint, Object, 0 /*Side1*/, Depth_Stack);
IFound = true;
}
}
tmin += Isosrf->accuracy * 5.0;
if((tmax - tmin) < Isosrf->accuracy)
break;
Isosrf->Inv3 *= -1;
}
if(IFound)
Increase_Counter(stats[Ray_IsoSurface_Tests_Succeeded]);
}
return (IFound);
}