//Test for Sphere --> Sphere Collision
public Contact Collides(Sphere sphere)
{
return base.Collides(this, sphere);
}
//Sphere --> Plane Collision Detection and Contact Info generation
//Returns null if no collision, a contact object if a collision occurs
protected Contact Collides(Sphere sphere, Plane plane)
{
//Remove the absolute value to allow full penetration of the sphere
//float Distance = Vector3.Dot(plane.Normal, sphere.position - plane.position) / plane.Normal.Length();
float Distance = Math.Abs(Vector3.Dot(plane.Normal, sphere.Position - plane.Position)) / plane.Normal.Length();
if (Distance <= sphere.Radius)
{
Contact contact = new Contact();
contact.ContactType = CollisionType.FaceFace;
contact.ContactNormal = plane.Normal;
contact.PenetrationDepth = sphere.Radius - Distance;
contact.ContactPoint = sphere.Position - contact.ContactNormal * Distance;
contact.DeepestPoint = sphere.Position - contact.ContactNormal * (Distance + contact.PenetrationDepth);
return contact;
}
//No Collision
return null;
}
//Sphere --> Box Collision Detection and Contact Info generation
//Returns null if no collision, a contact object if a collision occurs
protected Contact Collides(Sphere sphere, Box box)
{
Contact contact = new Contact();
Vector3[] vertices = box.GetVertices();
//Implementation based on pages 644-645 of Geometric Tools for Computer Graphics [Philip J. Schneider & David H. Eberly, Morgan Kaufmann]
//Make sure the sphere is touching the box before continuing
//Distance from sphere to each of the box vertices
float[] VertexDistances = new float[8];
//Compute distance
for (int i = 0; i < vertices.Length; i++)
{
VertexDistances[i] = (vertices[i] - sphere.Position).Length();
}
//Obtain Minimum and Maximum values for X,Y,Z
Vector3 min = new Vector3(vertices[0].X, vertices[0].Y, vertices[0].Z);
Vector3 max = new Vector3(vertices[0].X, vertices[0].Y, vertices[0].Z);
for (int i = 0; i < vertices.Length; i++)
{
if (min.X > vertices[i].X)
min.X = vertices[i].X;
if (min.Y > vertices[i].Y)
min.Y = vertices[i].Y;
if (min.Z > vertices[i].Z)
min.Z = vertices[i].Z;
if (max.X < vertices[i].X)
max.X = vertices[i].X;
if (max.Y < vertices[i].Y)
max.Y = vertices[i].Y;
if (max.Z < vertices[i].Z)
max.Z = vertices[i].Z;
}
//Test for collision
double dSquared = 0;
if (sphere.Position.X < min.X)
{
dSquared += (float)Math.Pow((sphere.Position.X - min.X), 2);
}
else if (sphere.Position.X > max.X)
{
dSquared += (float)Math.Pow((sphere.Position.X - max.X), 2);
}
if (sphere.Position.Y < min.Y)
{
dSquared += (float)Math.Pow((sphere.Position.Y - min.Y), 2);
}
else if (sphere.Position.Y > max.Y)
{
dSquared += (float)Math.Pow((sphere.Position.Y - max.Y), 2);
}
if (sphere.Position.Z < min.Z)
{
dSquared += (float)Math.Pow((sphere.Position.Z - min.Z), 2);
}
else if (sphere.Position.Z > max.Z)
{
float test = sphere.Position.Z - max.Z;
dSquared += (float)Math.Pow((sphere.Position.Z - max.Z), 2);
}
if (dSquared <= Math.Pow(sphere.Radius, 2))
{
#region Vertex-Face
foreach (Vector3 vertex in vertices)
{
float Distance = (sphere.Position - vertex).Length();
if (Distance <= sphere.Radius)
{
Vector3 midline = vertex - sphere.Position;
contact.ContactType = CollisionType.VertexFace;
contact.ContactNormal = -midline / midline.Length();
contact.ContactPoint = vertex;// sphere.position + (midline * sphere.Radius) / midline.Length();
contact.DeepestPoint = sphere.Position + (midline * sphere.Radius) / midline.Length();
contact.PenetrationDepth = ((vertex - contact.DeepestPoint)).Length();
return contact;
}
}
#endregion
#region Face-Face
Vector3[] normals = box.GetNormals();
float[] Distances = new float[6];
for (int i = 0; i < normals.Length; i++)
{
Distances[i] = Vector3.Dot(normals[i], sphere.Position - (box.Position + (normals[i] * box.Size / 2))) / normals[i].Length();
}
int index = 0;
//The number of faces whose normals are not pointing away from the sphere.
int PositiveCount = 0;
for (int i = 0; i < Distances.Length; i++)
{
if (Distances[i] > 0)
{
if (Distances[i] <= sphere.Radius)
{
PositiveCount++;
}
if (Distances[index] > Distances[i] || Distances[index] < 0)
{
index = i;
}
}
}
if (Distances[index] <= sphere.Radius && PositiveCount == 1)
{
contact = new Contact();
contact.ContactType = CollisionType.FaceFace;
contact.ContactNormal = normals[index];
contact.PenetrationDepth = sphere.Radius - Distances[index]; //+
contact.ContactPoint = sphere.Position - contact.ContactNormal * VertexDistances[index];
contact.DeepestPoint = sphere.Position - contact.ContactNormal * (sphere.Radius);
return contact;
}
#endregion
#region Edge-Face
float[] PointDistances = new float[12];
Vector3[,] VertexPair = new Vector3[12, 2];
//Front Vertices
Vector3 x0 = sphere.Position;
Vector3 x1 = VertexPair[0, 0] = vertices[0];
Vector3 x2 = VertexPair[0, 1] = vertices[1];
PointDistances[0] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
x1 = VertexPair[1, 0] = vertices[1];
x2 = VertexPair[1, 1] = vertices[3];
PointDistances[1] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
x1 = VertexPair[2, 0] = vertices[3];
x2 = VertexPair[2, 1] = vertices[2];
PointDistances[2] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
x1 = VertexPair[3, 0] = vertices[2];
x2 = VertexPair[3, 1] = vertices[0];
PointDistances[3] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
//Back Vertices
x1 = VertexPair[4, 0] = vertices[4];
x2 = VertexPair[4, 1] = vertices[5];
PointDistances[4] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
x1 = VertexPair[5, 0] = vertices[5];
x2 = VertexPair[5, 1] = vertices[7];
PointDistances[5] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
x1 = VertexPair[6, 0] = vertices[7];
x2 = VertexPair[6, 1] = vertices[6];
PointDistances[6] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
x1 = VertexPair[7, 0] = vertices[6];
x2 = VertexPair[7, 1] = vertices[4];
PointDistances[7] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
//Side Vertices
x1 = VertexPair[8, 0] = vertices[0];
x2 = VertexPair[8, 1] = vertices[4];
PointDistances[8] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
x1 = VertexPair[9, 0] = vertices[1];
x2 = VertexPair[9, 1] = vertices[5];
PointDistances[9] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
x1 = VertexPair[10, 0] = vertices[2];
x2 = VertexPair[10, 1] = vertices[6];
PointDistances[10] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
x1 = VertexPair[11, 0] = vertices[3];
x2 = VertexPair[11, 1] = vertices[7];
PointDistances[11] = Vector3.Cross((x0 - x1), (x0 - x2)).Length() / (x2 - x1).Length();
index = 0;
for (int i = 0; i < PointDistances.Length; i++)
{
if (PointDistances[index] > PointDistances[i])
{
index = i;
}
}
if (PointDistances[index] < sphere.Radius)
{
x1 = VertexPair[index, 0];
x2 = VertexPair[index, 1];
//Required to compute point on the line
float t = -Vector3.Dot((x1 - x0), (x2 - x1)) / (x2 - x1).LengthSquared();
Vector3 LinePoint = new Vector3(x1.X + (x2.X - x1.X) * t, x1.Y + (x2.Y - x1.Y) * t, x1.Z + (x2.Z - x1.Z) * t);
contact.ContactType = CollisionType.EdgeFace;
contact.ContactNormal = Vector3.Normalize(x0 - LinePoint);
contact.ContactPoint = LinePoint;
contact.DeepestPoint = x0 - contact.ContactNormal / contact.ContactNormal.Length() * sphere.Radius;
contact.PenetrationDepth = (contact.DeepestPoint - contact.ContactPoint).Length();
return contact;
}
#endregion
}
//No Contact found...
return null;
}
public Contact Collides(Sphere sphere)
{
return base.Collides(sphere, this);
}
//Sphere --> Sphere Collision Detection and Contact Info generation
//Returns null if no collision, a contact object if a collision occurs
protected Contact Collides(Sphere sphere1, Sphere sphere2)
{
if ((sphere1.Position - sphere2.Position).Length() <= (sphere1.Radius + sphere2.Radius))
{
Contact contact = new Contact();
contact.ContactType = CollisionType.FaceFace;
contact.ContactNormal = (sphere1.Position - sphere2.Position) / (sphere1.Position - sphere2.Position).Length();
Vector3 Midline = (sphere1.Position - sphere2.Position);
contact.ContactPoint = sphere2.Position + (Midline / Midline.Length() * sphere2.Radius);
contact.DeepestPoint = (sphere1.Position - (Midline / Midline.Length() * sphere1.Radius));
contact.PenetrationDepth = sphere1.Radius + sphere2.Radius - Midline.Length();
return contact;
}
//No Collision
return null;
}
//Retrieve Objects nearby given Sphere in the Quad Tree and Superior layers of the quadrant if UpperLayerDepth > 0
public void RetrieveNearbyObjects(Sphere sphere, ref List<Primitive> primitivesNearby, int UpperLayerDepth = 0)
{
RetrieveNearbyObjects(sphere, ref primitivesNearby, UpperLayerDepth, null);
}
//Retrieve Objects nearby given Sphere in the Quad Tree and Superior layers of the quadrant if UpperLayerDepth > 0
public void RetrieveNearbyObjects(Sphere sphere, ref List<Primitive> primitivesNearby, int UpperLayerDepth, QuadTreeNode node, int DepthCounter = 0)
{
if (node == null)
node = Head;
//Process North-West Part
if (node.Children[0] != null)
{
//If Sphere can be found inside the North West quadrant of the current quadrant or if this depth level should be covered, go inside
if ((sphere.Position.X - sphere.Radius <= node.Position.X && sphere.Position.Z + sphere.Radius <= node.Position.Y) || (this.depth - DepthCounter) <= UpperLayerDepth)
{
RetrieveNearbyObjects(sphere, ref primitivesNearby, UpperLayerDepth, node.Children[0], DepthCounter + 1);
}
}
//Process North-East Part
if (node.Children[1] != null)
{
//If Sphere can be found inside the North East quadrant of the current quadrant or if this depth level should be covered, go inside
if ((sphere.Position.X + sphere.Radius >= node.Position.X && sphere.Position.Z + sphere.Radius <= node.Position.Y) || (this.depth - DepthCounter) <= UpperLayerDepth)
{
RetrieveNearbyObjects(sphere, ref primitivesNearby, UpperLayerDepth, node.Children[1], DepthCounter + 1);
}
}
//Process South-West Part
if (node.Children[2] != null)
{
//If Sphere can be found inside the South West quadrant of the current quadrant or if this depth level should be covered, go inside
if ((sphere.Position.X - sphere.Radius <= node.Position.X && sphere.Position.Z - sphere.Radius >= node.Position.Y) || (this.depth - DepthCounter) <= UpperLayerDepth)
{
RetrieveNearbyObjects(sphere, ref primitivesNearby, UpperLayerDepth, node.Children[2], DepthCounter + 1);
}
}
//Process South-East Part
if (node.Children[3] != null)
{
//If Sphere can be found inside the South West quadrant of the current quadrant or if this depth level should be covered, go inside
if ((sphere.Position.X + sphere.Radius >= node.Position.X && sphere.Position.Z - sphere.Radius >= node.Position.Y) || (this.depth - DepthCounter) <= UpperLayerDepth)
{
RetrieveNearbyObjects(sphere, ref primitivesNearby, UpperLayerDepth, node.Children[3], DepthCounter + 1);
}
}
//Return all primitives found in the node
if (node.Primitives != null)
{
//Add all primitives found in the quadrant that aren't already in the list
foreach (Primitive prim in node.Primitives)
{
if (!primitivesNearby.Contains(prim))
{
primitivesNearby.Add(prim);
}
}
}
}
private void ResolveStaticCollision(Contact contact, Entity ent, Sphere sphere)
{
//-contact.ContactNormal * (Vector3.Dot(-contact.ContactNormal, ent.Velocity));
Vector3 closingVelocity = contact.ContactNormal * contact.PenetrationDepth;
//The Y axis vector value of the position should always remain zero.
closingVelocity.Y = 0;
ent.Position += closingVelocity;
if (ent is Hero)
{
CastSoundWave(COLLISON_SOUND_RADIUS);
}
}
//Return boxes that generate Quad Tree Grid. It is possible to filter lower levels and display only higher ones by setting UpperLayerDepth to a value > 0
public List<Box> RetrieveBoundariesFromPosition(Sphere sphere, ref List<Box> boxes, int UpperLayerDepth = 0, QuadTreeNode node = null)
{
if (node == null)
node = Head;
if (boxes == null)
boxes = new List<Box>();
float nodeSize = (float)Math.Pow(2, UpperLayerDepth);
//Make sure sphere fits in the current node and go deeper
if (sphere.Radius * 2 < node.Size / nodeSize)
{
//Process North-West Part
if (node.Children[0] != null)
{
if (sphere.Position.X - sphere.Radius <= node.Position.X && sphere.Position.Z + sphere.Radius <= node.Position.Y)
{
RetrieveBoundariesFromPosition(sphere, ref boxes, UpperLayerDepth, node.Children[0]);
}
}
//Process North-East Part
if (node.Children[1] != null)
{
if (sphere.Position.X + sphere.Radius >= node.Position.X && sphere.Position.Z + sphere.Radius <= node.Position.Y)
{
RetrieveBoundariesFromPosition(sphere, ref boxes, UpperLayerDepth, node.Children[1]);
}
}
//Process South-West Part
if (node.Children[2] != null)
{
if (sphere.Position.X - sphere.Radius <= node.Position.X && sphere.Position.Z - sphere.Radius >= node.Position.Y)
{
RetrieveBoundariesFromPosition(sphere, ref boxes, UpperLayerDepth, node.Children[2]);
}
}
//Process South-East Part
if (node.Children[3] != null)
{
if (sphere.Position.X + sphere.Radius >= node.Position.X && sphere.Position.Z - sphere.Radius >= node.Position.Y)
{
RetrieveBoundariesFromPosition(sphere, ref boxes, UpperLayerDepth, node.Children[3]);
}
}
}
//return box sized based on depth level
boxes.Add(new Box(new Vector3(node.Position.X, 1.5f, node.Position.Y), new Vector3(0), new Vector3(node.Size * 2, 3, node.Size * 2)));
return boxes;
}
//checking zombie to zombie collisions.
//Model as a sphere (in reality just a cylinder but since all at same height it only checks for a circle radius around character
private void checkZombietoZombie(Zombie z1, Zombie z2)
{
//creating appropriate shapes
Sphere p1 = new Collisions.Sphere(z1.Position, z1.Velocity, z1.modelRadius);
Sphere p2 = new Collisions.Sphere(z2.Position, z2.Velocity, z2.modelRadius);
Contact c = p1.Collides(p2);
if (c != null)
{
if (c.DeepestPoint.Length() > 0)
{
z1.Position -= c.DeepestPoint - c.ContactPoint;
z2.Position += c.DeepestPoint - c.ContactPoint;
}
}
}
private void DoGunAttack(Weapon weapon, Entity actionCaster)
{
//do soundeffect attached
if (weapon.weaponType == WeaponType.Handgun9mm)
{
if (Player.PowerupsList.Contains(silencer))
{
sound.StopSilencer();
//need to check the time
sound.playSilencer();
}
else
{
sound.Stopgun();
sound.playgun();
}
}
if (weapon.weaponType == WeaponType.Magnum)
{
sound.StopMagnum();
//need to check the time
sound.playMagnum();
}
// find closest zombie, if any, in the line of fire and have him take the damage
Ray ray = new Ray(actionCaster.Position, Vector3.Normalize(actionCaster.Velocity));
Zombie closestVictim = null;
float? closestIntersect = 100;
foreach (Zombie z in zombies)
{
if ((z.Position - actionCaster.Position).Length() < weapon.Range)
{
BoundingSphere bs = new BoundingSphere(z.Position, z.modelRadius);
float? intersection = ray.Intersects(bs);
if (intersection != null && intersection < closestIntersect)
{
closestIntersect = intersection;
closestVictim = z;
}
}
}
// check if ray intersects nearby primitives from quad tree
// if so, check if intersections are closer than the closest zombie intersection
Sphere heroSphere = new Sphere(actionCaster.Position, actionCaster.Velocity, actionCaster.modelRadius);
List<Primitive> primitives = new List<Primitive>();
LevelQuadTree.RetrieveNearbyObjects(heroSphere, ref primitives);
foreach (Box box in primitives)
{
BoundingBox bbox = new BoundingBox(
new Vector3(box.Position.X - box.Size.X / 2, box.Position.Y - box.Size.Y / 2, box.Position.Z - box.Size.Z / 2),
new Vector3(box.Position.X + box.Size.X / 2, box.Position.Y + box.Size.Y / 2, box.Position.Z + box.Size.Z / 2)
);
if (ray.Intersects(bbox) != null && ray.Intersects(bbox) < closestIntersect)
return;
}
if (closestVictim != null)
{
closestVictim.Alert(actionCaster as Hero);
if (weapon.weaponType == WeaponType.Magnum && closestIntersect > 20)
closestVictim.TakeDamage(weapon.FirePower / 10);
else if (weapon.weaponType == WeaponType.Magnum && closestIntersect > 10)
closestVictim.TakeDamage(weapon.FirePower / 5);
else
closestVictim.TakeDamage(weapon.FirePower);
}
}
//checking zombie to character
private void checkZombietoPlayer(Zombie z)
{
Sphere p1 = new Collisions.Sphere(z.Position, z.Velocity, z.modelRadius);
Sphere p2 = new Collisions.Sphere(Player.Position, Player.Velocity, Player.modelRadius);
Contact c = p1.Collides(p2);
if (c != null)
{
if (c.DeepestPoint.Length() > 0)
{
if (Player.Stance == AnimationStance.Standing)//if standing, dont push player, only affect zombie
{
z.Position -= c.DeepestPoint - c.ContactPoint;
Player.Position += c.DeepestPoint - c.ContactPoint;
}
else//push player back when walking
{
z.Position -= c.DeepestPoint - c.ContactPoint;
}
}
}
}
// returns if there are any static obstructions between the two positions
private bool CheckObstructions(Vector3 position, Vector3 destination)
{
Ray ray = new Ray(position, Vector3.Normalize(destination - position));
Sphere sphere = new Sphere(position, Vector3.Zero, 1);
List<Primitive> primitives = new List<Primitive>();
LevelQuadTree.RetrieveNearbyObjects(sphere, ref primitives);
foreach (Box box in primitives)
{
BoundingBox bbox = new BoundingBox(
new Vector3(box.Position.X - box.Size.X / 2, box.Position.Y - box.Size.Y / 2, box.Position.Z - box.Size.Z / 2),
new Vector3(box.Position.X + box.Size.X / 2, box.Position.Y + box.Size.Y / 2, box.Position.Z + box.Size.Z / 2)
);
if (ray.Intersects(bbox) != null)
return true;
}
return false;
}
private void CheckCollisions(bool Extinguisher)
{
#region Player collisions
Sphere heroSphere = new Sphere(Player.Position, Player.Velocity, Player.modelRadius);
List<Primitive> primitivesNearby = new List<Primitive>();
LevelQuadTree.RetrieveNearbyObjects(heroSphere, ref primitivesNearby,2);
/*foreach (Primitive bx in primitivesNearby)
{
if (!TotalNearbyBoxes.Contains(bx))
TotalNearbyBoxes.Add(bx);
}*/
Contact EndingContact = heroSphere.Collides(EscapeSpot);
if (EndingContact != null && (Player.ItemsList.ContainsKey(key1) || Player.ItemsList.ContainsKey(key2)))
{
GameStates.GameStates.ZombieGameState = GameStates.GameStates.GameState.End;
}
primitivesNearby.AddRange(fireHazards);
foreach (Primitive p in primitivesNearby)
{
Contact c = heroSphere.Collides(p as Box);
if (c != null)
{
ResolveStaticCollision(c, Player, heroSphere);
if(fireDamageDelay <=0)
{
if(((Box)p).Tag == "Fire1" || ((Box)p).Tag == "Fire2" || ((Box)p).Tag == "Fire3" || ((Box)p).Tag == "Fire4")
{
Player.TakeDamage(25);
fireDamageDelay = 5;
}
}
}
}
if (Extinguisher)
{
Sphere ExtSphere = new Sphere(Player.Position + (Player.Velocity / Player.Velocity.Length()) * 20, Vector3.One, 10);
for (int i = 0; i < fireHazards.Count;i++)
{
Sphere boxSphere = new Sphere(fireHazards[i].Position, Vector3.One, fireHazards[i].Size.X / 2);
Contact contact = ExtSphere.Collides(boxSphere);
if (contact != null)
{
if (fireHazards[i].Tag == "Fire1")
{
FireEmitter.particleGroups[0].controller.LifeSpan -= 5;
if (FireEmitter.particleGroups[0].controller.LifeSpan <= 0)
{
FireEmitter.Stop();
fireHazards.Remove(fireHazards[i]);
}
}
if (fireHazards.Count > 0)
{
if (fireHazards[i].Tag == "Fire2")
{
FireEmitter2.particleGroups[0].controller.LifeSpan -= 5;
if (FireEmitter2.particleGroups[0].controller.LifeSpan <= 0)
{
FireEmitter2.Stop();
fireHazards.Remove(fireHazards[i]);
}
}
if (fireHazards[i].Tag == "Fire3")
{
FireEmitter3.particleGroups[0].controller.LifeSpan -= 5;
if (FireEmitter3.particleGroups[0].controller.LifeSpan <= 0)
{
FireEmitter3.Stop();
fireHazards.Remove(fireHazards[i]);
}
}
if (fireHazards[i].Tag == "Fire4")
{
FireEmitter4.particleGroups[0].controller.LifeSpan -= 5;
if (FireEmitter4.particleGroups[0].controller.LifeSpan <= 0)
{
FireEmitter4.Stop();
fireHazards.Remove(fireHazards[i]);
}
}
}
}
}
}
#endregion
#region Zombie collisions
foreach (Zombie z in zombies)
{
// Check for zombies in sight radius and zombies who are not wandering
if ((z.Position - Player.Position).Length() < SIGHT_RADIUS || z.BehaviouralState != BehaviourState.Wander)
{
Sphere zombieSphere = new Sphere(z.Position, z.Velocity, z.modelRadius);
List<Primitive> primitives = new List<Primitive>();
LevelQuadTree.RetrieveNearbyObjects(zombieSphere, ref primitives);
primitives.AddRange(fireHazards);
foreach (Primitive p in primitives)
{
Contact c = zombieSphere.Collides(p as Box);
if (c != null)
{
if (z.BehaviouralState == BehaviourState.Wander)
z.Velocity = Vector3.Cross( z.Velocity, Vector3.Up);
ResolveStaticCollision(c, z, zombieSphere);
}
}
}
}
#endregion
foreach (Zombie z1 in zombies)
{
if ((z1.Position - Player.Position).Length() < SIGHT_RADIUS || z1.BehaviouralState != BehaviourState.Wander)
{
checkZombietoPlayer(z1);
foreach (Zombie z2 in zombies)
{
if (!z2.Equals(z1) && ((z2.Position - Player.Position).Length() < SIGHT_RADIUS || z2.BehaviouralState != BehaviourState.Wander))
{
checkZombietoZombie(z1, z2);
}
}
}
}
checkItemCollisions();
}
// Creates a bounding sphere with the specified radius. Any Zombie intersecting the
// bounding sphere will be alerted to the Hero's presence
private void CastSoundWave(float radius)
{
if (radius > 0)
{
Sphere soundSphere = new Sphere(Player.Position, new Vector3(), radius);
foreach (Zombie z in zombies)
{
Sphere zs = new Sphere(z.Position, z.Velocity, z.modelRadius);
if (zs.Collides(soundSphere) != null)
z.Alert(Player);
}
}
}
// get closest feasible pathfinding node to the given position
public PathFinding.Node GetPathfindingNode(Vector3 position, Vector3 destination)
{
// perform super secret second purpose
if (destination != Vector3.Up)
{
// if path between positions is clear, return origin, else return up vector
if (CheckObstructions(position, destination))
return new PathFinding.Node(Vector3.Up);
else
return new PathFinding.Node(Vector3.Zero);
}
List<PathFinding.Node> possibleMatches = new List<PathFinding.Node>();
PathFinding.Node reachableNode = null;
float distanceToNode = 100;
LevelQuadTree.RetrieveNearbyObjects(position, ref possibleMatches, 2, null, 2);
foreach (PathFinding.Node node in possibleMatches)
{
float separatingDistance = (node.position - position).Length();
bool clearPath = true;
Ray ray = new Ray(position, Vector3.Normalize(node.position - position));
Sphere sphere = new Sphere(position, Vector3.Zero, 1);
List<Primitive> primitives = new List<Primitive>();
LevelQuadTree.RetrieveNearbyObjects(sphere, ref primitives);
foreach (Box box in primitives)
{
BoundingBox bbox = new BoundingBox(
new Vector3(box.Position.X - box.Size.X / 2, box.Position.Y - box.Size.Y / 2, box.Position.Z - box.Size.Z / 2),
new Vector3(box.Position.X + box.Size.X / 2, box.Position.Y + box.Size.Y / 2, box.Position.Z + box.Size.Z / 2)
);
if (ray.Intersects(bbox) != null && ray.Intersects(bbox) < separatingDistance)
{
clearPath = false;
break;
}
}
if (clearPath && distanceToNode > separatingDistance)
{
distanceToNode = separatingDistance;
reachableNode = node;
}
}
return reachableNode;
}
