float Object::Shadow_box(Ray ray) const // Bounding box function for shadows
{
float t, thit = 1.0;
float xmin, xmax, ymin, ymax, zmin, zmax;
Vector Q;
Vector i(1,0,0), j(0,1,0), k(0,0,1);
Vector base = ray.getBase();
Vector dir = ray.getDir();
xmin = this->vmin.x;
xmax = this->vmax.x;
ymin = this->vmin.y;
ymax = this->vmax.y;
zmin = this->vmin.z;
zmax = this->vmax.z;
t = ray.intersect_plane(i, this->vmax);
if( (t > 0.0) && (t < 1.0) )
{
Q = base + dir.scale(t);
if( (ymin <= Q.y) && (Q.y <= ymax) && (zmin <= Q.z) && (Q.z <= zmax) )
{
thit = t;
return thit;
}
}
t = ray.intersect_plane(i.scale(-1), this->vmin);
if( (t > 0.0) && (t < 1.0) )
{
Q = base + dir.scale(t);
if( (ymin <= Q.y) && (Q.y <= ymax) && (zmin <= Q.z) && (Q.z <= zmax) )
{
thit = t;
return thit;
}
}
t = ray.intersect_plane(j, this->vmax);
if( (t > 0.0) && (t < 1.0) )
{
Q = base + dir.scale(t);
if( (xmin <= Q.x) && (Q.x <= xmax) && (zmin <= Q.z) && (Q.z <= zmax) )
{
thit = t;
return thit;
}
}
t = ray.intersect_plane(j.scale(-1), this->vmin);
if( (t > 0.0) && (t < 1.0) )
{
Q = base + dir.scale(t);
if( (xmin <= Q.x) && (Q.x <= xmax) && (zmin <= Q.z) && (Q.z <= zmax) )
{
thit = t;
return thit;
}
}
t = ray.intersect_plane(k, this->vmax);
if( (t > 0.0) && (t < 1.0) )
{
Q = base + dir.scale(t);
if( (xmin <= Q.x) && (Q.x <= xmax) && (ymin <= Q.y) && (Q.y <= ymax) )
{
thit = t;
return thit;
}
}
t = ray.intersect_plane(k.scale(-1), this->vmin);
if( (t > 0.0) && (t < 1.0) )
{
Q = base + dir.scale(t);
if( (xmin <= Q.x) && (Q.x <= xmax) && (ymin <= Q.y) && (Q.y <= ymax) )
{
thit = t;
return thit;
}
}
return thit;
}
float Object::bound_box(Ray ray) const
{
float t, thit = HUGEREAL;
float xmin, xmax, ymin, ymax, zmin, zmax;
Vector Q;
Vector i(1,0,0), j(0,1,0), k(0,0,1);
Vector base = ray.getBase();
Vector dir = ray.getDir();
xmin = this->vmin.x;
xmax = this->vmax.x;
ymin = this->vmin.y;
ymax = this->vmax.y;
zmin = this->vmin.z;
zmax = this->vmax.z;
t = ray.intersect_plane(i, this->vmax);
if(t > 0.001)
{
Q = base + dir.scale(t);
if( (ymin <= Q.y) && (Q.y <= ymax) && (zmin <= Q.z) && (Q.z <= zmax) )
{
thit = t;
return thit;
}
}
t = ray.intersect_plane(i.scale(-1), this->vmin);
if(t > 0.001)
{
Q = base + dir.scale(t);
if( (ymin <= Q.y) && (Q.y <= ymax) && (zmin <= Q.z) && (Q.z <= zmax) )
{
thit = t;
return thit;
}
}
t = ray.intersect_plane(j, this->vmax);
if(t > 0.001)
{
Q = base + dir.scale(t);
if( (xmin <= Q.x) && (Q.x <= xmax) && (zmin <= Q.z) && (Q.z <= zmax) )
{
thit = t;
return thit;
}
}
t = ray.intersect_plane(j.scale(-1), this->vmin);
if(t > 0.001)
{
Q = base + dir.scale(t);
if( (xmin <= Q.x) && (Q.x <= xmax) && (zmin <= Q.z) && (Q.z <= zmax) )
{
thit = t;
return thit;
}
}
t = ray.intersect_plane(k, this->vmax);
if(t > 0.001)
{
Q = base + dir.scale(t);
if( (xmin <= Q.x) && (Q.x <= xmax) && (ymin <= Q.y) && (Q.y <= ymax) )
{
thit = t;
return thit;
}
}
t = ray.intersect_plane(k.scale(-1), this->vmin);
if(t > 0.001)
{
Q = base + dir.scale(t);
if( (xmin <= Q.x) && (Q.x <= xmax) && (ymin <= Q.y) && (Q.y <= ymax) )
{
thit = t;
return thit;
}
}
return thit;
}
