/// <summary>
/// Registers a new processed object that is build into the navigation mesh
/// </summary>
/// <param name="entity">The entity that was processed</param>
/// <param name="data">The collider vertex data that is generated for this entity</param>
public void Add(Entity entity, NavigationMeshInputBuilder data)
{
StaticColliderComponent collider = entity.Get<StaticColliderComponent>();
if (collider != null)
{
int hash = NavigationMeshBuildUtils.HashEntityCollider(collider);
Objects.Add(entity.Id, new NavigationMeshCachedBuildObject()
{
Guid = entity.Id,
ParameterHash = hash,
Data = data
});
}
}
/// <summary>
/// Registers a new processed object that is build into the navigation mesh
/// </summary>
/// <param name="entity">The entity that was processed</param>
/// <param name="data">The collider vertex data that is generated for this entity</param>
public void Add(Entity entity, NavigationMeshInputBuilder data)
{
StaticColliderComponent collider = entity.Get <StaticColliderComponent>();
if (collider != null)
{
int hash = NavigationMeshBuildUtils.HashEntityCollider(collider);
Objects.Add(entity.Id, new NavigationMeshCachedBuildObject()
{
Guid = entity.Id,
ParameterHash = hash,
Data = data
});
}
}
/// <summary>
/// Appends another vertex data builder
/// </summary>
/// <param name="other"></param>
public void AppendOther(NavigationMeshInputBuilder other)
{
// Copy vertices
int vbase = Points.Count;
for (int i = 0; i < other.Points.Count; i++)
{
Vector3 point = other.Points[i];
Points.Add(point);
BoundingBox.Merge(ref BoundingBox, ref point, out BoundingBox);
}
// Copy indices with offset applied
foreach (int index in other.Indices)
Indices.Add(index + vbase);
}
/// <summary>
/// Appends another vertex data builder
/// </summary>
/// <param name="other"></param>
public void AppendOther(NavigationMeshInputBuilder other)
{
// Copy vertices
int vbase = Points.Count;
for (int i = 0; i < other.Points.Count; i++)
{
Vector3 point = other.Points[i];
Points.Add(point);
BoundingBox.Merge(ref BoundingBox, ref point, out BoundingBox);
}
// Copy indices with offset applied
foreach (int index in other.Indices)
{
Indices.Add(index + vbase);
}
}
private void CollectInputGeometry()
{
// Reset state
fullRebuild = false;
updatedAreas.Clear();
fullRebuild = oldBuild == null;
sceneNavigationMeshInputBuilder = new NavigationMeshInputBuilder();
foreach (var entity in sceneEntities)
{
StaticColliderComponent collider = entity.Get <StaticColliderComponent>();
bool colliderEnabled = collider != null && ((CollisionFilterGroupFlags)collider.CollisionGroup & asset.IncludedCollisionGroups) != 0 && collider.Enabled;
if (colliderEnabled)
{
// Compose collider shape, mark as disabled if it failed so the respective area gets updated
collider.ComposeShape();
if (collider.ColliderShape == null)
{
colliderEnabled = false;
}
}
if (!colliderEnabled) // Removed or disabled
{
// Check for old object
NavigationMeshCachedBuildObject oldObject = null;
if (oldBuild?.Objects.TryGetValue(entity.Id, out oldObject) ?? false)
{
// This object has been disabled, update the area because it was removed and continue to the next object
updatedAreas.Add(oldObject.Data.BoundingBox);
}
}
else if (oldBuild?.IsUpdatedOrNew(entity) ?? true) // Is the entity updated?
{
TransformComponent entityTransform = entity.Transform;
Matrix entityWorldMatrix = entityTransform.WorldMatrix;
NavigationMeshInputBuilder entityNavigationMeshInputBuilder = new NavigationMeshInputBuilder();
bool isDeferred = false;
// Interate through all the colliders shapes while queueing all shapes in compound shapes to process those as well
Queue <ColliderShape> shapesToProcess = new Queue <ColliderShape>();
shapesToProcess.Enqueue(collider.ColliderShape);
while (shapesToProcess.Count > 0)
{
var shape = shapesToProcess.Dequeue();
var shapeType = shape.GetType();
if (shapeType == typeof(BoxColliderShape))
{
var box = (BoxColliderShape)shape;
var boxDesc = (BoxColliderShapeDesc)box.Description;
Matrix transform = box.PositiveCenterMatrix * entityWorldMatrix;
var meshData = GeometricPrimitive.Cube.New(boxDesc.Size);
entityNavigationMeshInputBuilder.AppendMeshData(meshData, transform);
}
else if (shapeType == typeof(SphereColliderShape))
{
var sphere = (SphereColliderShape)shape;
var sphereDesc = (SphereColliderShapeDesc)sphere.Description;
Matrix transform = sphere.PositiveCenterMatrix * entityWorldMatrix;
var meshData = GeometricPrimitive.Sphere.New(sphereDesc.Radius);
entityNavigationMeshInputBuilder.AppendMeshData(meshData, transform);
}
else if (shapeType == typeof(CylinderColliderShape))
{
var cylinder = (CylinderColliderShape)shape;
var cylinderDesc = (CylinderColliderShapeDesc)cylinder.Description;
Matrix transform = cylinder.PositiveCenterMatrix * entityWorldMatrix;
var meshData = GeometricPrimitive.Cylinder.New(cylinderDesc.Height, cylinderDesc.Radius);
entityNavigationMeshInputBuilder.AppendMeshData(meshData, transform);
}
else if (shapeType == typeof(CapsuleColliderShape))
{
var capsule = (CapsuleColliderShape)shape;
var capsuleDesc = (CapsuleColliderShapeDesc)capsule.Description;
Matrix transform = capsule.PositiveCenterMatrix * entityWorldMatrix;
var meshData = GeometricPrimitive.Capsule.New(capsuleDesc.Length, capsuleDesc.Radius);
entityNavigationMeshInputBuilder.AppendMeshData(meshData, transform);
}
else if (shapeType == typeof(ConeColliderShape))
{
var cone = (ConeColliderShape)shape;
var coneDesc = (ConeColliderShapeDesc)cone.Description;
Matrix transform = cone.PositiveCenterMatrix * entityWorldMatrix;
var meshData = GeometricPrimitive.Cone.New(coneDesc.Radius, coneDesc.Height);
entityNavigationMeshInputBuilder.AppendMeshData(meshData, transform);
}
else if (shapeType == typeof(StaticPlaneColliderShape))
{
var plane = (StaticPlaneColliderShape)shape;
var planeDesc = (StaticPlaneColliderShapeDesc)plane.Description;
Matrix transform = plane.PositiveCenterMatrix * entityWorldMatrix;
// Defer infinite planes because their size is not defined yet
deferredShapes.Add(new DeferredShape
{
Description = planeDesc,
Transform = transform,
Entity = entity,
NavigationMeshInputBuilder = entityNavigationMeshInputBuilder
});
isDeferred = true;
}
else if (shapeType == typeof(ConvexHullColliderShape))
{
var hull = (ConvexHullColliderShape)shape;
Matrix transform = hull.PositiveCenterMatrix * entityWorldMatrix;
// Convert hull indices to int
int[] indices = new int[hull.Indices.Count];
if (hull.Indices.Count % 3 != 0)
{
throw new InvalidOperationException("Physics hull does not consist of triangles");
}
for (int i = 0; i < hull.Indices.Count; i += 3)
{
indices[i] = (int)hull.Indices[i];
indices[i + 1] = (int)hull.Indices[i + 1];
indices[i + 2] = (int)hull.Indices[i + 2];
}
entityNavigationMeshInputBuilder.AppendArrays(hull.Points.ToArray(), indices, transform);
}
else if (shapeType == typeof(CompoundColliderShape))
{
// Unroll compound collider shapes
var compound = (CompoundColliderShape)shape;
for (int i = 0; i < compound.Count; i++)
{
shapesToProcess.Enqueue(compound[i]);
}
}
}
if (!isDeferred)
{
// Store current entity in build cache
currentBuild.Add(entity, entityNavigationMeshInputBuilder);
// Add (?old) and new bounding box to modified areas
sceneNavigationMeshInputBuilder.AppendOther(entityNavigationMeshInputBuilder);
NavigationMeshCachedBuildObject oldObject = null;
if (oldBuild?.Objects.TryGetValue(entity.Id, out oldObject) ?? false)
{
updatedAreas.Add(oldObject.Data.BoundingBox);
}
updatedAreas.Add(entityNavigationMeshInputBuilder.BoundingBox);
}
}
else // Not updated
{
// Copy old data into vertex buffer
NavigationMeshCachedBuildObject oldObject = oldBuild.Objects[entity.Id];
sceneNavigationMeshInputBuilder.AppendOther(oldObject.Data);
currentBuild.Add(entity, oldObject.Data);
}
}
// Unload loaded collider shapes
foreach (var pair in loadedColliderShapes)
{
contentManager.Unload(pair.Key);
}
// Store calculated bounding box
if (generateBoundingBox)
{
globalBoundingBox = sceneNavigationMeshInputBuilder.BoundingBox;
}
// Process deferred shapes
Vector3 maxSize = globalBoundingBox.Maximum - globalBoundingBox.Minimum;
float maxDiagonal = Math.Max(maxSize.X, Math.Max(maxSize.Y, maxSize.Z));
foreach (DeferredShape shape in deferredShapes)
{
StaticPlaneColliderShapeDesc planeDesc = (StaticPlaneColliderShapeDesc)shape.Description;
Plane plane = new Plane(planeDesc.Normal, planeDesc.Offset);
// Pre-Transform plane parameters
plane.Normal = Vector3.TransformNormal(plane.Normal, shape.Transform);
float offset = Vector3.Dot(shape.Transform.TranslationVector, plane.Normal);
plane.D += offset;
// Generate source plane triangles
Vector3[] planePoints;
int[] planeInds;
NavigationMeshBuildUtils.BuildPlanePoints(ref plane, maxDiagonal, out planePoints, out planeInds);
Vector3 tangent, bitangent;
NavigationMeshBuildUtils.GenerateTangentBinormal(plane.Normal, out tangent, out bitangent);
// Calculate plane offset so that the plane always covers the whole range of the bounding box
Vector3 planeOffset = Vector3.Dot(globalBoundingBox.Center, tangent) * tangent;
planeOffset += Vector3.Dot(globalBoundingBox.Center, bitangent) * bitangent;
VertexPositionNormalTexture[] vertices = new VertexPositionNormalTexture[planePoints.Length];
for (int i = 0; i < planePoints.Length; i++)
{
vertices[i] = new VertexPositionNormalTexture(planePoints[i] + planeOffset, Vector3.UnitY, Vector2.Zero);
}
GeometricMeshData <VertexPositionNormalTexture> meshData = new GeometricMeshData <VertexPositionNormalTexture>(vertices, planeInds, false);
shape.NavigationMeshInputBuilder.AppendMeshData(meshData, Matrix.Identity);
sceneNavigationMeshInputBuilder.AppendMeshData(meshData, Matrix.Identity);
// Update bounding box after plane generation
if (generateBoundingBox)
{
globalBoundingBox = sceneNavigationMeshInputBuilder.BoundingBox;
}
// Store deferred shape in build cahce just like normal onesdddd
currentBuild.Add(shape.Entity, shape.NavigationMeshInputBuilder);
// NOTE: Force a full rebuild when moving unbound shapes such as ininite planes
// the alternative is to intersect the old and new plane with the tiles to see which ones changed
// although in most cases it will be a horizontal plane and all tiles will be affected anyways
fullRebuild = true;
}
}