void Sphere::raycast(const Raycast& ray, RayHitList& reports) const
{
double a, b, c;
params(ray, a, b, c);
double discr = b*b - 4*a*c;
if(discr > 0.0)
{
double disrcSqrt = glm::sqrt(discr);
double t1 = (-b - disrcSqrt) / (2 * a);
if(0.0 < t1 && t1 < ray.limit)
{
glm::dvec3 pt = ray.origin + ray.direction*t1;
glm::dvec3 n = glm::normalize(pt - _center);
reports.add(t1, ray, pt, n,
RayHitReport::NO_TEXCOORD,
_coating.get());
}
double t2 = (-b + disrcSqrt) / (2 * a);
if(0.0 < t2 && t2 < ray.limit)
{
glm::dvec3 pt = ray.origin + ray.direction*t2;
glm::dvec3 n = glm::normalize(pt - _center);
reports.add(t2, ray, pt, n,
RayHitReport::NO_TEXCOORD,
_coating.get());
}
}
else if(discr == 0.0)
{
double t = -b / (2 * a);
if(0.0 < t && t < ray.limit)
{
glm::dvec3 pt = ray.origin + ray.direction*t;
glm::dvec3 n = glm::normalize(pt - _center);
reports.add(t, ray, pt, n,
RayHitReport::NO_TEXCOORD,
_coating.get());
}
}
}
double SearchStructure::findNearestIntersection(
const Raycast& raycast,
RayHitReport& reportMin,
RayHitList& rayHitList) const
{
Raycast ray(raycast);
size_t minId = -1;
size_t zId = 0;
size_t zoneCount = _searchZones.size();
while(zId < zoneCount)
{
const SearchZone& zone = _searchZones[zId];
if(zone.bounds == StageZone::UNBOUNDED.get() ||
zone.bounds->intersects(ray, rayHitList))
{
for(size_t s = zone.begSurf; s < zone.endSurf; ++s)
{
rayHitList.clear();
_searchSurfaces[s]->raycast(ray, rayHitList);
RayHitReport* node = rayHitList.head;
while(node != nullptr)
{
if(0.0 < node->length && node->length < ray.limit)
{
ray.limit = node->length;
reportMin = *node;
minId = s;
}
node = node->_next;
}
}
++zId;
}
else
{
zId = zone.endZone;
}
}
if(!_isOptimized && reportMin.length != raycast.limit)
{
incrementCounter(_searchSurfaces[minId], ray.entropy);
}
return reportMin.length;
}
void SurfaceAnd::raycast(const Raycast& ray,
RayHitList& reports) const
{
size_t surfCount = _surfs.size();
for(size_t i=0; i < surfCount; ++i)
{
Surface* surf = _surfs[i].get();
RayHitReport* last = reports.head;
surf->raycast(ray, reports);
RayHitReport* node = reports.head;
RayHitReport* parent = nullptr;
while(node != last)
{
bool isIn = true;
for(size_t j=0; j < surfCount; ++j)
{
if(i != j)
{
if(_surfs[j]->isIn(node->position) ==
EPointPosition::OUT)
{
isIn = false;
break;
}
}
}
RayHitReport* next = node->_next;
bool keep = isIn;
if(keep)
{
// Keep ray hit
parent = node;
}
else
{
// Dispose ray hit
if(parent == nullptr)
reports.head = next;
else
parent->_next = next;
reports.dispose(node);
}
node = next;
}
}
}
bool SearchStructure::intersectsScene(
const Raycast& raycast,
RayHitList& rayHitList,
double incomingEntropy) const
{
rayHitList.clear();
size_t zId = 0;
size_t zoneCount = _searchZones.size();
while(zId < zoneCount)
{
const SearchZone& zone = _searchZones[zId];
if(zone.bounds == StageZone::UNBOUNDED.get() ||
zone.bounds->intersects(raycast, rayHitList))
{
for(size_t s = zone.begSurf; s < zone.endSurf; ++s)
{
if(_searchSurfaces[s]->intersects(raycast, rayHitList))
{
if(!_isOptimized)
incrementCounter(_searchSurfaces[s],
incomingEntropy);
return true;
}
}
++zId;
}
else
{
zId = zone.endZone;
}
}
return false;
}
void Disk::raycast(const Raycast& ray, RayHitList& reports) const
{
glm::dvec3 orig = glm::dvec3(_invTransform * glm::dvec4(ray.origin, 1.0));
glm::dvec3 dir = glm::dvec3(_invTransform * glm::dvec4(ray.direction, 0.0));
double dirDotNorm = glm::dot(_normal, dir);
if(dirDotNorm != 0.0)
{
double t = -(glm::dot(_normal, orig) + _d) / dirDotNorm;
if(0.0 < t && t < ray.limit)
{
if(glm::distance(orig + dir * t, _center) < _radius)
{
glm::dvec3 pt = ray.origin + ray.direction * t;
reports.add(t, pt, _transformN,
RayHitReport::NO_TEXCOORD,
_coating.get(),
_innerMat.get(),
_outerMat.get());
}
}
}
}
// ref : http://marctenbosch.com/photon/mbosch_intersection.pdf
void Quadric::raycast(const Raycast& ray, RayHitList& reports) const
{
double a, b, c;
params(ray, a, b, c);
if(a != 0.0)
{
double dscr = b*b - 4*a*c;
if(dscr > 0.0)
{
double dsrcSqrt = glm::sqrt(dscr);
{
double t = (-b - dsrcSqrt) / (2 * a);
if(0.0 < t && t < ray.limit)
{
glm::dvec3 pt1 = ray.origin + ray.direction*t;
glm::dvec3 n1 = computeNormal(_q, pt1);
reports.add(t, ray, pt1, n1,
RayHitReport::NO_TEXCOORD,
_coating.get());
}
}
{
double t = (-b + dsrcSqrt) / (2 * a);
if(0.0 < t && t < ray.limit)
{
glm::dvec3 pt2 = ray.origin + ray.direction*t;
glm::dvec3 n2 = computeNormal(_q, pt2);
reports.add(t, ray, pt2, n2,
RayHitReport::NO_TEXCOORD,
_coating.get());
}
}
}
else if (dscr == 0.0)
{
double t = -b / (2 * a);
if(0.0 < t && t < ray.limit)
{
glm::dvec3 pt = ray.origin + ray.direction*t;
glm::dvec3 n = computeNormal(_q, pt);
reports.add(t, ray, pt, n,
RayHitReport::NO_TEXCOORD,
_coating.get());
}
}
}
else
{
if(b != 0.0)
{
double t = -c / b;
if(0.0 < t && t < ray.limit)
{
glm::dvec3 pt = ray.origin + ray.direction * t;
glm::dvec3 n = computeNormal(_q, pt);
reports.add(t, ray, pt, n,
RayHitReport::NO_TEXCOORD,
_coating.get());
}
}
}
}
