RNBoolean R3Contains(const R3Point& point, const R3Box& box)
{
// Return whether point contains box
if (!box.IsPoint()) return FALSE;
if (!R3Contains(point, box.Min())) return FALSE;
return TRUE;
}
bool CheckBoundingBoxWithSphere(R3Sphere *sphere, R3Player *player) {
R3Box bbox = player->shape->mesh->bbox;
R3Point coords[8];
coords[1] = bbox.Corner(0, 0, 0);
coords[2] = bbox.Corner(0, 0, 1);
coords[3] = bbox.Corner(0, 1, 0);
coords[4] = bbox.Corner(0, 1, 1);
coords[5] = bbox.Corner(1, 0, 0);
coords[6] = bbox.Corner(1, 0, 1);
coords[7] = bbox.Corner(1, 1, 0);
coords[8] = bbox.Corner(1, 1, 1);
// check if it is entirely within the sphere
bool in = true;
for (int i = 0; i < 8; i++) {
if (R3Distance(coords[i], sphere->Center()) < sphere->Radius()){
in = false;
break;
}
}
if (in) return false;
for (int i = 0; i < 8; i++) {
if (R3Distance(coords[i], sphere->Center()) < sphere->Radius())
return true;
}
if (R3Distance(player->pos, sphere->Center()) < sphere->Radius())
return true;
return false;
}
RNBoolean R3Contains(const R3Sphere& sphere, const R3Box& box)
{
// Return whether sphere contains box
R3Vector v = box.Centroid() - sphere.Center();
R3Point corner = box.Corner(v.Octant());
return R3Contains(sphere, corner);
}
int Bubble::Collides(R3Mesh* mesh, R3Vector offset) {
R3Box box = mesh -> bbox;
R3Vector SepAxis = pos - (box.Centroid() + offset);
double dist = SepAxis.Length();
SepAxis.Normalize();
double x = SepAxis.X();
double y = SepAxis.Y();
double z = SepAxis.Z();
if (x >= y && x >= z && x != 0)
SepAxis /= x;
else if (y >= x && y >= z != 0)
SepAxis /= y;
else if (z != 0)
SepAxis /= z;
double x_len = box.XLength();
double y_len = box.YLength();
double z_len = box.ZLength();
//effective radius
SepAxis.SetX(x * x_len/2.0);
SepAxis.SetY(y * y_len/2.0);
SepAxis.SetZ(z * z_len/2.0);
if (dist <= (size + SepAxis.Length()))
return 1;
return 0;
}
static R3Vector calculate_sink_force(R3Scene* scene, R3Particle* particle)
{
R3ParticleSink* sink;
R3Vector force = R3Vector(0,0,0);
for (int i = 0; i < scene->NParticleSinks(); i++)
{
sink = scene->ParticleSink(i);
if (sink->shape->type == R3_SPHERE_SHAPE)
{
R3Sphere* sphere = sink->shape->sphere;
R3Point center = sphere->Center();
R3Vector f = -(particle->position - center);
double d = f.Length() - sphere->Radius();
f.Normalize();
double mag = sink->intensity / (sink->constant_attenuation +
sink->linear_attenuation*d +
sink->quadratic_attenuation*d*d);
force += f*mag;
}
else if (sink->shape->type == R3_MESH_SHAPE)
{
R3Mesh* mesh = sink->shape->mesh;
R3Point center = R3Point(0,0,0);
for (unsigned int j = 0; j < mesh->vertices.size(); j++)
{
center += mesh->vertices[i]->position / mesh->vertices.size();
}
R3Vector f = -(particle->position - center);
double d = f.Length();
f.Normalize();
double mag = sink->intensity / (sink->constant_attenuation +
sink->linear_attenuation*d +
sink->quadratic_attenuation*d*d);
force += f*mag;
}
else if (sink->shape->type == R3_BOX_SHAPE)
{
R3Box* box = sink->shape->box;
R3Point center = R3Point((box->XMax() - box->XMin())/2 + box->XMin(),
(box->YMax() - box->YMin())/2 + box->YMin(),
(box->ZMax() - box->ZMin())/2 + box->ZMin());
R3Vector f = -(particle->position - center);
double d = f.Length();
f.Normalize();
double mag = sink->intensity / (sink->constant_attenuation +
sink->linear_attenuation*d +
sink->quadratic_attenuation*d*d);
force += f*mag;
}
}
return force;
}
RNBoolean R3Contains(const R3Plane& plane, const R3Box& box)
{
// Return whether plane contains box
if (!box.IsPlanar()) return FALSE;
if (!R3Contains(plane, box.Min())) return FALSE;
if (!R3Contains(plane, box.Max())) return FALSE;
return TRUE;
}
RNBoolean R3Contains(const R3Span& span, const R3Box& box)
{
// Return whether span contains box
if (!R3Contains(span.Line(), box)) return FALSE;
if (!R3Contains(span, box.Min())) return FALSE;
if (!R3Contains(span, box.Max())) return FALSE;
return TRUE;
}
RNBoolean R3Contains(const R3Line& line, const R3Box& box)
{
// Return whether line contains box
if (!box.IsLinear()) return FALSE;
if (!R3Contains(line, box.Min())) return FALSE;
if (!R3Contains(line, box.Max())) return FALSE;
return TRUE;
}
RNBoolean R3Contains(const R3Triangle& triangle, const R3Box& box)
{
// Return whether triangle contains box
if (!box.IsPlanar()) return FALSE;
if (!R3Contains(triangle, box.Min())) return FALSE;
if (!R3Contains(triangle, box.Max())) return FALSE;
return TRUE;
}
bool ComputeMeshIntersection(R3Mesh *mesh, R3Player *player) {
R3Box bbox = mesh->bbox;
for (unsigned int i = 0; i < player->shape->mesh->vertices.size(); i++) {
if (R3Distance(player->shape->mesh->vertices[i]->position, bbox.Centroid()) < bbox.DiagonalLength() / 2) {
return true;
}
}
return false;
}
double R3SignedDistance(const R3Plane& plane, const R3Box& box)
{
// Return signed distance from plane to box
int ix = (plane.Normal().X() > 0) ? 0 : 1;
int iy = (plane.Normal().Y() > 0) ? 0 : 1;
int iz = (plane.Normal().Z() > 0) ? 0 : 1;
double d1 = R3SignedDistance(plane, box.Corner(ix, iy, iz));
if (d1 >= 0) return d1;
double d2 = R3SignedDistance(plane, box.Corner(1-ix, 1-iy, 1-iz));
if (d2 < 0) return d2;
else return 0.0;
}
void R3Box::
Transform (const R3Transformation& transformation)
{
// Do not transform empty box
if (IsEmpty()) return;
// Transform box ???
R3Box tmp = R3null_box;
for (RNOctant octant = 0; octant < RN_NUM_OCTANTS; octant++) {
R3Point corner(Corner(octant));
corner.Transform(transformation);
tmp.Union(corner);
}
*this = tmp;
}
RNBoolean R3Contains(const R3Box& box, const R3Ray& ray)
{
// Return whether box contains ray
if (box.IsFinite()) return FALSE;
RNAbort("Not Implemented");
return FALSE;
}
RNBoolean R3Contains(const R3Box& box, const R3Plane& plane)
{
// Return whether box contains plane
if (box.IsFinite()) return FALSE;
RNAbort("Not Implemented");
return FALSE;
}
RNBoolean R3Contains(const R3Ray& ray, const R3Box& box)
{
// Return whether ray contains box
if (!R3Contains(ray.Line(), box)) return FALSE;
RNOctant octant = ray.Vector().Octant();
if (!R3Contains(ray, box.Corner(~octant & 0x7))) return FALSE;
return TRUE;
}
void R3Box::
Transform (const R3Matrix& matrix)
{
// Do not transform empty box
if (IsEmpty()) return;
// Transform box
R3Box tmp = R3null_box;
tmp.Union(matrix * Corner(0,0,0));
tmp.Union(matrix * Corner(0,0,1));
tmp.Union(matrix * Corner(0,1,0));
tmp.Union(matrix * Corner(0,1,1));
tmp.Union(matrix * Corner(1,0,0));
tmp.Union(matrix * Corner(1,0,1));
tmp.Union(matrix * Corner(1,1,0));
tmp.Union(matrix * Corner(1,1,1));
*this = tmp;
}
RNBoolean R3Contains(const R3Box& box, const R3Halfspace& halfspace)
{
// Return whether box contains halfspace
RNOctant octant = halfspace.Normal().Octant();
R3Point corner = box.Corner(octant);
if (!RNIsFinite(corner.X())) return FALSE;
if (!RNIsFinite(corner.Y())) return FALSE;
if (!RNIsFinite(corner.Z())) return FALSE;
RNAbort("Not Implemented");
return FALSE;
}
RNBoolean R3Contains(const R3Box& box, const R3Point& point)
{
// Return whether box contains point
if (box.IsEmpty()) return FALSE;
if (RNIsLess(point.X(), box.XMin())) return FALSE;
if (RNIsLess(point.Y(), box.YMin())) return FALSE;
if (RNIsLess(point.Z(), box.ZMin())) return FALSE;
if (RNIsGreater(point.X(), box.XMax())) return FALSE;
if (RNIsGreater(point.Y(), box.YMax())) return FALSE;
if (RNIsGreater(point.Z(), box.ZMax())) return FALSE;
return TRUE;
}
RNBoolean R3Contains(const R3Box& box, const R3Sphere& sphere)
{
// Return whether box contains sphere
if (box.IsEmpty()) return FALSE;
if (sphere.IsEmpty()) return TRUE;
if (RNIsLess(sphere.Center().X() - sphere.Radius(), box.XMin())) return FALSE;
if (RNIsLess(sphere.Center().Y() - sphere.Radius(), box.YMin())) return FALSE;
if (RNIsLess(sphere.Center().Z() - sphere.Radius(), box.ZMin())) return FALSE;
if (RNIsGreater(sphere.Center().X() + sphere.Radius(), box.XMax())) return FALSE;
if (RNIsGreater(sphere.Center().Y() + sphere.Radius(), box.YMax())) return FALSE;
if (RNIsGreater(sphere.Center().Z() + sphere.Radius(), box.ZMax())) return FALSE;
return TRUE;
}
////////////////////////////////////////////////////////////
// Check for collisions with rocks
////////////////////////////////////////////////////////////
void CheckCollisions(R3Scene *scene)
{
const double MOVEMENT_WEIGHT = 0.02;
// check each bobsled - //TODO CHANGE THIS WHEN WE HAVE MULTIPLE BOBSLEDS
for (unsigned int i = 0; i < 1; i++)
{
R3Bobsled *bobsled = scene->bobsleds[i];
bobsled->x_vibration = 0.0;
R3Box &bbox = bobsled->sleds[0]->mesh->bbox;
// printf("bobsled: %f %f %f %f %f %f\n", bbox.XMin(), bbox.XMax(), bbox.YMin(), bbox.YMax(), bbox.ZMin(), bbox.ZMax());
// check each obstacle for a collision
for (unsigned int j = 0; j < scene->obstacles.size(); j++)
{
R3Obstacle *obstacle = scene->obstacles[j];
R3Box intersection = bbox;
R3Box *obstacle_box = ObstacleBBox(obstacle);
intersection.Intersect(*obstacle_box);
if (intersection.XMin() < intersection.XMax() &&
intersection.YMin() < intersection.YMax() &&
intersection.ZMin() < intersection.ZMax())
{
double current_z = bobsled->velocity.Z();
// slow down
if (obstacle->hit_count == 0 && abs(current_z) > 40)
bobsled->velocity.SetZ(current_z * 0.6);
// add left-to-right vibration if this is a rock
if (obstacle->type == OBSTACLE_ROCK)
{
if (obstacle->hit_count - 2 * ((int) obstacle->hit_count / 2) == 0)
bobsled->x_vibration = MOVEMENT_WEIGHT * (1 + Rand());
else
bobsled->x_vibration = - MOVEMENT_WEIGHT * (1 + Rand());
}
obstacle->hit_count++;
}
delete obstacle_box;
}
}
}
void R3MeshSearchTree::
Outline(R3MeshSearchTreeNode *node, const R3Box& node_box) const
{
// Draw kdtree nodes recursively
if (node->children[0]) {
assert(node->children[1]);
assert(node->split_coordinate >= node_box[RN_LO][node->split_dimension]);
assert(node->split_coordinate <= node_box[RN_HI][node->split_dimension]);
R3Box child0_box(node_box);
R3Box child1_box(node_box);
child0_box[RN_HI][node->split_dimension] = node->split_coordinate;
child1_box[RN_LO][node->split_dimension] = node->split_coordinate;
Outline(node->children[0], child0_box);
Outline(node->children[1], child1_box);
}
else {
node_box.Outline();
}
}
static bool in_sink(R3Scene* scene, R3Particle* particle, double delta_time)
{
R3ParticleSink* sink;
for (int i = 0; i < scene->NParticleSinks(); i++)
{
sink = scene->ParticleSink(i);
if (sink->shape->type == R3_SPHERE_SHAPE)
{
R3Sphere* sphere = sink->shape->sphere;
R3Point center = sphere->Center();
double radius = sphere->Radius();
if ((particle->position - center).Length() < radius)
return true;
}
else if (sink->shape->type == R3_MESH_SHAPE)
{
R3Ray ray = R3Ray(particle->position, particle->velocity);
R3Node node;
node.shape = sink->shape;
R3Intersection inter = IntersectMesh(&node, &ray);
if (inter.hit == true
&& inter.t <= ((particle->velocity).Length() * (delta_time) * 2))
return true;
}
else if (sink->shape->type == R3_BOX_SHAPE)
{
R3Box* box = sink->shape->box;
if (particle->position.Z() < box->ZMax() && particle->position.Z() > box->ZMin()
&& particle->position.Y() < box->YMax() && particle->position.Y() > box->YMin()
&& particle->position.X() < box->XMax() && particle->position.X() > box->XMin())
return true;
}
}
return false;
}
RNScalar R3MeshSearchTree::
DistanceSquared(const R3Point& query_position, const R3Box& box, RNScalar max_distance_squared) const
{
// Find and check axial distances from face to node box
RNScalar dx, dy, dz;
if (query_position.X() > box.XMax()) dx = query_position.X() - box.XMax();
else if (query_position.X() < box.XMin()) dx = box.XMin()- query_position.X();
else dx = 0.0;
RNScalar dx_squared = dx * dx;
if (dx_squared >= max_distance_squared) return dx_squared;
if (query_position.Y() > box.YMax()) dy = query_position.Y() - box.YMax();
else if (query_position.Y() < box.YMin()) dy = box.YMin()- query_position.Y();
else dy = 0.0;
RNScalar dy_squared = dy * dy;
if (dy_squared >= max_distance_squared) return dy_squared;
if (query_position.Z() > box.ZMax()) dz = query_position.Z() - box.ZMax();
else if (query_position.Z() < box.ZMin()) dz = box.ZMin()- query_position.Z();
else dz = 0.0;
RNScalar dz_squared = dz * dz;
if (dz_squared >= max_distance_squared) return dz_squared;
// Find and check actual distance from face to node box
RNScalar distance_squared = 0;
if ((dy == 0.0) && (dz == 0.0)) distance_squared = dx_squared;
else if ((dx == 0.0) && (dz == 0.0)) distance_squared = dy_squared;
else if ((dx == 0.0) && (dy == 0.0)) distance_squared = dz_squared;
else distance_squared = dx_squared + dy_squared + dz_squared;
// Return distance squared
return distance_squared;
}
void R3MeshSearchTree::
InsertFace(R3MeshSearchTreeFace *face, R3MeshSearchTreeNode *node, const R3Box& node_box, int depth)
{
// Check if face intersects box
if (!R3Intersects(mesh, face->face, node_box)) return;
// Check if interior node
if (node->children[0]) {
// Interior node -- Insert into children
assert(node->children[1]);
const R3Box& face_box = mesh->FaceBBox(face->face);
if (face_box[RN_LO][node->split_dimension] <= node->split_coordinate) {
R3Box node0_box(node_box);
node0_box[RN_HI][node->split_dimension] = node->split_coordinate;
InsertFace(face, node->children[0], node0_box, depth + 1);
}
if (face_box[RN_HI][node->split_dimension] >= node->split_coordinate) {
R3Box node1_box(node_box);
node1_box[RN_LO][node->split_dimension] = node->split_coordinate;
InsertFace(face, node->children[1], node1_box, depth + 1);
}
}
else {
// Check face area
RNScalar node_diagonal = node_box.DiagonalLength();
if (node_diagonal == 0) return;
RNScalar node_area = node_diagonal * node_diagonal;
RNScalar area_ratio = face->area / node_area;
if ((area_ratio >= max_area_ratio) ||
(depth >= max_depth)) {
// Face is too big/deep to be sorted into children, insert into big faces list
node->big_faces.Insert(face);
assert(face->reference_count >= 0);
face->reference_count++;
}
else {
// Leaf node -- Check if there is room for this face
if (node->small_faces.NEntries() < max_faces_per_node) {
// Simply insert face into list
node->small_faces.Insert(face);
face->reference_count++;
}
else {
// Create two children
node->children[0] = new R3MeshSearchTreeNode(node);
node->children[1] = new R3MeshSearchTreeNode(node);
node->split_dimension = node_box.LongestAxis();
node->split_coordinate = node_box.AxisCenter(node->split_dimension);
nnodes += 2;
// Re-insert faces into subtree
InsertFace(face, node, node_box, depth+1);
for (int i = 0; i < node->small_faces.NEntries(); i++) {
InsertFace(node->small_faces[i], node, node_box, depth+1);
}
// Clear out faces from node that is now interior
for (int i = 0; i < node->small_faces.NEntries(); i++) {
assert(node->small_faces[i]->reference_count > 0);
node->small_faces[i]->reference_count--;
}
node->small_faces.Empty();
}
}
}
}
void R3Box::
Intersect (const R3Box& box)
{
// Intersect with box
if (minpt.X() < box.XMin()) minpt[0] = box.XMin();
if (minpt.Y() < box.YMin()) minpt[1] = box.YMin();
if (minpt.Z() < box.ZMin()) minpt[2] = box.ZMin();
if (maxpt.X() > box.XMax()) maxpt[0] = box.XMax();
if (maxpt.Y() > box.YMax()) maxpt[1] = box.YMax();
if (maxpt.Z() > box.ZMax()) maxpt[2] = box.ZMax();
}
void R3Box::
Union (const R3Box& box)
{
// Expand this to include box
if (minpt.X() > box.XMin()) minpt[0] = box.XMin();
if (minpt.Y() > box.YMin()) minpt[1] = box.YMin();
if (minpt.Z() > box.ZMin()) minpt[2] = box.ZMin();
if (maxpt.X() < box.XMax()) maxpt[0] = box.XMax();
if (maxpt.Y() < box.YMax()) maxpt[1] = box.YMax();
if (maxpt.Z() < box.ZMax()) maxpt[2] = box.ZMax();
}
// test if a point is inside a bounding box
bool InsideBBox(R3Box box, R3Point point)
{
return point.X() > box.XMin() && point.X() < box.XMax() && point.Y() > box.YMin() && point.Y() < box.YMax() && point.Z() > box.ZMin() && point.Z() < box.ZMax();
}
RNBoolean R3Contains(const R3Box& box1, const R3Box& box2)
{
// Return whether box1 contains box2
if (box1.IsEmpty()) return FALSE;
if (box2.IsEmpty()) return TRUE;
if (RNIsLess(box2.XMin(), box1.XMin())) return FALSE;
if (RNIsLess(box2.YMin(), box1.YMin())) return FALSE;
if (RNIsLess(box2.ZMin(), box1.ZMin())) return FALSE;
if (RNIsGreater(box2.XMax(), box1.XMax())) return FALSE;
if (RNIsGreater(box2.YMax(), box1.YMax())) return FALSE;
if (RNIsGreater(box2.ZMax(), box1.ZMax())) return FALSE;
return TRUE;
}
static R3Particle* generate_random_box_particle(R3ParticleSource* source)
{
R3Box* box = source->shape->box;
int which_face = RandomNumber() * 6;
R3Point pos;
R3Vector dir;
if (which_face == 0)
{
pos = R3Point(box->XMin() + RandomNumber()*(box->XMax()-box->XMin()),
box->YMin() + RandomNumber()*(box->YMax()-box->YMin()),
box->ZMin());
dir = R3Vector(0, 0, -1);
}
else if (which_face == 1)
{
pos = R3Point(box->XMin() + RandomNumber()*(box->XMax()-box->XMin()),
box->YMin() + RandomNumber()*(box->YMax()-box->YMin()),
box->ZMax());
dir = R3Vector(0, 0, 1);
}
else if (which_face == 2)
{
pos = R3Point(box->XMin(),
box->YMin() + RandomNumber()*(box->YMax()-box->YMin()),
box->ZMin() + RandomNumber()*(box->ZMax()-box->ZMin()));
dir = R3Vector(-1, 0, 0);
}
else if (which_face == 3)
{
pos = R3Point(box->XMax(),
box->YMin() + RandomNumber()*(box->YMax()-box->YMin()),
box->ZMin() + RandomNumber()*(box->ZMax()-box->ZMin()));
dir = R3Vector(1, 0, 0);
}
else if (which_face == 4)
{
pos = R3Point(box->XMin() + RandomNumber()*(box->XMax()-box->XMin()),
box->YMin(),
box->ZMin() + RandomNumber()*(box->ZMax()-box->ZMin()));
dir = R3Vector(0, -1, 0);
}
else if (which_face == 5)
{
pos = R3Point(box->XMin() + RandomNumber()*(box->XMax()-box->XMin()),
box->YMax(),
box->ZMin() + RandomNumber()*(box->ZMax()-box->ZMin()));
dir = R3Vector(0, 1, 0);
}
R3Particle* particle = new R3Particle();
particle->position = pos;
particle->velocity = source->velocity * dir;
particle->mass = source->mass;
particle->fixed = source->fixed;
particle->drag = source->drag;
particle->elasticity = source->elasticity;
particle->lifetime = source->lifetime;
particle->material = source->material;
return particle;
}
RNBoolean R3Contains(const R3Halfspace& halfspace, const R3Box& box)
{
// Return whether halfspace contains box
RNOctant octant = halfspace.Normal().Octant();
return (R3Contains(halfspace, box.Corner(~octant & 0x7)));
}