static void Scale_Triangle(OBJECT *Object, VECTOR Vector, TRANSFORM * /*Trans*/)
{
/*DBL Length;*/
TRIANGLE *Triangle = (TRIANGLE *)Object;
if (!Test_Flag(Object, DEGENERATE_FLAG))
{
/* BEG ROSE
this is useless, because Compute_Triangle recalculates this anyway:
Triangle->Normal_Vector[X] = Triangle->Normal_Vector[X] / Vector[X];
Triangle->Normal_Vector[Y] = Triangle->Normal_Vector[Y] / Vector[Y];
Triangle->Normal_Vector[Z] = Triangle->Normal_Vector[Z] / Vector[Z];
VLength(Length, Triangle->Normal_Vector);
VInverseScaleEq(Triangle->Normal_Vector, Length);
Triangle->Distance /= Length;
END ROSE */
VEvaluateEq(Triangle->P1, Vector);
VEvaluateEq(Triangle->P2, Vector);
VEvaluateEq(Triangle->P3, Vector);
Compute_Triangle(Triangle, false);
}
}
static void Scale_Smooth_Triangle(OBJECT *Object, VECTOR Vector, TRANSFORM * /*Trans*/)
{
DBL Length;
SMOOTH_TRIANGLE *Triangle = (SMOOTH_TRIANGLE *)Object;
if (!Test_Flag(Object, DEGENERATE_FLAG))
{
/* BEG ROSE
this is useless, because Compute_Triange recalculates this anyway:
Triangle->Normal_Vector[X] = Triangle->Normal_Vector[X] / Vector[X];
Triangle->Normal_Vector[Y] = Triangle->Normal_Vector[Y] / Vector[Y];
Triangle->Normal_Vector[Z] = Triangle->Normal_Vector[Z] / Vector[Z];
VLength(Length, Triangle->Normal_Vector);
VScaleEq(Triangle->Normal_Vector, 1.0 / Length);
Triangle->Distance /= Length;
END ROSE */
VEvaluateEq(Triangle->P1, Vector);
VEvaluateEq(Triangle->P2, Vector);
VEvaluateEq(Triangle->P3, Vector);
/* BEG ROSE
The normal vectors also have to be transformed (BUG fix): */
Triangle->N1[X] /= Vector[X];
Triangle->N1[Y] /= Vector[Y];
Triangle->N1[Z] /= Vector[Z];
VLength(Length,Triangle->N1);
VScaleEq(Triangle->N1,1.0/Length);
Triangle->N2[X] /= Vector[X];
Triangle->N2[Y] /= Vector[Y];
Triangle->N2[Z] /= Vector[Z];
VLength(Length,Triangle->N2);
VScaleEq(Triangle->N2,1.0/Length);
Triangle->N3[X] /= Vector[X];
Triangle->N3[Y] /= Vector[Y];
Triangle->N3[Z] /= Vector[Z];
VLength(Length,Triangle->N3);
VScaleEq(Triangle->N3,1.0/Length);
/* END ROSE */
Compute_Triangle((TRIANGLE *)Triangle,true);
}
}
static void Scale_Box(OBJECT *Object, VECTOR Vector, TRANSFORM *Trans)
{
DBL temp;
BOX *Box = (BOX *)Object;
if (((BOX *)Object)->Trans == NULL)
{
VEvaluateEq(Box->bounds[0], Vector);
VEvaluateEq(Box->bounds[1], Vector);
if (Box->bounds[0][X] > Box->bounds[1][X])
{
temp = Box->bounds[0][X];
Box->bounds[0][X] = Box->bounds[1][X];
Box->bounds[1][X] = temp;
}
if (Box->bounds[0][Y] > Box->bounds[1][Y])
{
temp = Box->bounds[0][Y];
Box->bounds[0][Y] = Box->bounds[1][Y];
Box->bounds[1][Y] = temp;
}
if (Box->bounds[0][Z] > Box->bounds[1][Z])
{
temp = Box->bounds[0][Z];
Box->bounds[0][Z] = Box->bounds[1][Z];
Box->bounds[1][Z] = temp;
}
Compute_Box_BBox((BOX *)Object);
}
else
{
Transform_Box(Object, Trans);
}
}
static DBL constant_fog(RAY *Ray, DBL Depth, DBL Width, FOG *Fog, COLOUR Colour)
{
DBL k;
VECTOR P;
if (Fog->Turb != NULL)
{
Depth += Width / 2.0;
VEvaluateRay(P, Ray->Initial, Depth, Ray->Direction);
VEvaluateEq(P, Fog->Turb->Turbulence);
/* The further away the less influence turbulence has. */
k = exp(-Width / Fog->Distance);
Width *= 1.0 - k * min(1.0, Turbulence(P, Fog->Turb, NULL)*Fog->Turb_Depth);
}
Assign_Colour(Colour, Fog->Colour);
return (exp(-Width / Fog->Distance));
}
void Warp_EPoint (VECTOR TPoint, VECTOR EPoint, TPATTERN *TPat)
{
VECTOR PTurbulence,RP;
int Axis,i,temp_rand;
int blockX = 0, blockY = 0, blockZ = 0 ;
SNGL BlkNum;
DBL Length;
DBL Strength;
WARP *Warp=TPat->Warps;
TURB *Turb;
TRANS *Tr;
REPEAT *Repeat;
BLACK_HOLE *Black_Hole;
VECTOR Delta, Center;
Assign_Vector(TPoint, EPoint);
while (Warp != NULL)
{
switch(Warp->Warp_Type)
{
case CLASSIC_TURB_WARP:
if ((TPat->Type == MARBLE_PATTERN) ||
(TPat->Type == NO_PATTERN) ||
(TPat->Type == WOOD_PATTERN))
{
break;
}
/* If not a special type, fall through to next case */
case EXTRA_TURB_WARP:
Turb=(TURB *)Warp;
DTurbulence (PTurbulence, TPoint, Turb);
TPoint[X] += PTurbulence[X] * Turb->Turbulence[X];
TPoint[Y] += PTurbulence[Y] * Turb->Turbulence[Y];
TPoint[Z] += PTurbulence[Z] * Turb->Turbulence[Z];
break;
case NO_WARP:
break;
case TRANSFORM_WARP:
Tr=(TRANS *)Warp;
MInvTransPoint(TPoint, TPoint, &(Tr->Trans));
break;
case REPEAT_WARP:
Repeat=(REPEAT *)Warp;
Assign_Vector(RP,TPoint);
Axis=Repeat->Axis;
BlkNum=(SNGL)floor(TPoint[Axis]/Repeat->Width);
RP[Axis]=TPoint[Axis]-BlkNum*Repeat->Width;
if (((int)BlkNum) & 1)
{
VEvaluateEq(RP,Repeat->Flip);
if ( Repeat->Flip[Axis] < 0 )
{
RP[Axis] = Repeat->Width+RP[Axis];
}
}
VAddScaledEq(RP,BlkNum,Repeat->Offset);
Assign_Vector(TPoint,RP);
break;
case BLACK_HOLE_WARP:
Black_Hole = (BLACK_HOLE *) Warp ;
Assign_Vector (Center, Black_Hole->Center) ;
if (Black_Hole->Repeat)
{
/* first, get the block number we're in for each dimension */
/* block numbers are (currently) calculated relative to 0 */
/* we use floor () since it correctly returns -1 for the
first block below 0 in each axis */
/* one final point - we could run into overflow problems if
the repeat vector was small and the scene very large. */
if (Black_Hole->Repeat_Vector [X] >= Small_Tolerance)
blockX = (int) floor (TPoint [X] / Black_Hole->Repeat_Vector [X]) ;
if (Black_Hole->Repeat_Vector [Y] >= Small_Tolerance)
blockY = (int) floor (TPoint [Y] / Black_Hole->Repeat_Vector [Y]) ;
if (Black_Hole->Repeat_Vector [Z] >= Small_Tolerance)
blockZ = (int) floor (TPoint [Z] / Black_Hole->Repeat_Vector [Z]) ;
if (Black_Hole->Uncertain)
{
/* if the position is uncertain calculate the new one first */
/* this will allow the same numbers to be returned by frand */
temp_rand = POV_GET_OLD_RAND(); /*protect seed*/
POV_SRAND (Hash3d (blockX, blockY, blockZ)) ;
Center [X] += FRAND () * Black_Hole->Uncertainty_Vector [X] ;
Center [Y] += FRAND () * Black_Hole->Uncertainty_Vector [Y] ;
Center [Z] += FRAND () * Black_Hole->Uncertainty_Vector [Z] ;
POV_SRAND (temp_rand) ; /*restore*/
}
Center [X] += Black_Hole->Repeat_Vector [X] * blockX ;
Center [Y] += Black_Hole->Repeat_Vector [Y] * blockY ;
Center [Z] += Black_Hole->Repeat_Vector [Z] * blockZ ;
}
VSub (Delta, TPoint, Center) ;
VLength (Length, Delta) ;
/* Length is the distance from the centre of the black hole */
if (Length >= Black_Hole->Radius) break ;
if (Black_Hole->Type == 0)
{
/* now convert the length to a proportion (0 to 1) that the point
is from the edge of the black hole. a point on the perimeter
of the black hole will be 0.0 ; a point at the centre will be
1.0 ; a point exactly halfway will be 0.5, and so forth. */
Length = (Black_Hole->Radius - Length) / Black_Hole->Radius ;
/* Strength is the magnitude of the transformation effect. firstly,
apply the Power variable to Length. this is meant to provide a
means of controlling how fast the power of the Black Hole falls
off from its centre. if Power is 2.0, then the effect is inverse
square. increasing power will cause the Black Hole to be a lot
weaker in its effect towards its perimeter.
finally we multiply Strength with the Black Hole's Strength
variable. if the resultant value exceeds 1.0 we clip it to 1.0.
this means a point will never be transformed by more than its
original distance from the centre. the result of this clipping
is that you will have an 'exclusion' area near the centre of
the black hole where all points whose final value exceeded or
equalled 1.0 were moved by a fixed amount. this only happens
if the Strength value of the Black Hole was greater than one. */
Strength = pow (Length, Black_Hole->Power) * Black_Hole->Strength ;
if (Strength > 1.0) Strength = 1.0 ;
/* if the Black Hole is inverted, it gives the impression of 'push-
ing' the pattern away from its centre. otherwise it sucks. */
VScaleEq (Delta, Black_Hole->Inverted ? -Strength : Strength) ;
/* add the scaled Delta to the input point to end up with TPoint. */
VAddEq (TPoint, Delta) ;
}
break;
/* 10/23/1998 Talious added SPherical Cylindrical and toroidal
warps */
case CYLINDRICAL_WARP:
warp_cylindrical(TPoint, (CYLW *)Warp);
break;
case PLANAR_WARP:
warp_planar(TPoint, (PLANARW *)Warp);
break;
case SPHERICAL_WARP:
warp_spherical(TPoint, (SPHEREW *)Warp);
break;
case TOROIDAL_WARP:
warp_toroidal(TPoint, (TOROIDAL *) Warp);
break;
default:
Error("Warp type %d not yet implemented",Warp->Warp_Type);
}
Warp=Warp->Next_Warp;
}
for (i=X; i<=Z; i++)
if (TPoint[i] > COORDINATE_LIMIT)
TPoint[i]= COORDINATE_LIMIT;
else
if (TPoint[i] < -COORDINATE_LIMIT)
TPoint[i] = -COORDINATE_LIMIT;
}
static DBL ground_fog(RAY *Ray, DBL Depth, DBL Width, FOG *Fog, COLOUR Colour)
{
DBL fog_density, delta;
DBL start, end;
DBL y1, y2, k;
VECTOR P, P1, P2;
/* Get start point. */
VEvaluateRay(P1, Ray->Initial, Depth, Ray->Direction);
/* Get end point. */
VLinComb2(P2, 1.0, P1, Width, Ray->Direction);
/*
* Could preform transfomation here to translate Start and End
* points into ground fog space.
*/
VDot(y1, P1, Fog->Up);
VDot(y2, P2, Fog->Up);
start = (y1 - Fog->Offset) / Fog->Alt;
end = (y2 - Fog->Offset) / Fog->Alt;
/* Get integral along y-axis from start to end. */
if (start <= 0.0)
{
if (end <= 0.0)
{
fog_density = 1.0;
}
else
{
fog_density = (atan(end) - start) / (end - start);
}
}
else
{
if (end <= 0.0)
{
fog_density = (atan(start) - end) / (start - end);
}
else
{
delta = start - end;
if (fabs(delta) > EPSILON)
{
fog_density = (atan(start) - atan(end)) / delta;
}
else
{
fog_density = 1.0 / (Sqr(start) + 1.0);
}
}
}
/* Apply turbulence. */
if (Fog->Turb != NULL)
{
VHalf(P, P1, P2);
VEvaluateEq(P, Fog->Turb->Turbulence);
/* The further away the less influence turbulence has. */
k = exp(-Width / Fog->Distance);
Width *= 1.0 - k * min(1.0, Turbulence(P, Fog->Turb, NULL)*Fog->Turb_Depth);
}
Assign_Colour(Colour, Fog->Colour);
return (exp(-Width * fog_density / Fog->Distance));
}
