private IEnumerable <IfcProduct> GetCandidatesFromNode(IfcProduct original, XbimOctree <IfcProduct> node)
{
if (original != null && node != null)
{
//content which if from other models
var nodeContent = node.Content().Where(nc => (nc.ModelOf != original.ModelOf) && (nc.GetType() == original.GetType()));
var prodBBox = XbimRect3D.Empty;
foreach (var candidate in nodeContent)
{
//check BBoxes for equality
var contBBox = _prodBBsB[candidate];
prodBBox = _prodBBsA[original];
if (XbimAABBoxAnalyser.AlmostEqual(contBBox, prodBBox, _precision))
{
if (!_processedFromB.Contains(candidate))
{
_processedFromB.Add(candidate);
}
yield return(candidate);
}
//cope with the situation when product's bbox is on the border and
//it's equivalent from the second model might have end up on the higher level
var borderDirections = BBoxBorderDirections(node.Bounds, prodBBox);
var parents = GetParentsInDirections(borderDirections, node);
foreach (var parent in parents)
{
foreach (var item in GetCandidatesFromNode(original, parent))//recursion
{
if (!_processedFromB.Contains(candidate))
{
_processedFromB.Add(candidate);
}
yield return(candidate);
}
}
}
}
}
/// <summary>
/// Octree is created in the constructor. This method of spatial
/// indexing should speed up spatial queries by doing simple
/// computations on indexed geometries.
/// </summary>
/// <param name="model">Building model</param>
public XbimSpatialAnalyser(XbimModel model)
{
_model = model;
_bboxAnalyser = new XbimAABBoxAnalyser(model, _prodBBs);
_semanticAnalyser = new XbimSemanticAnalyser(model);
//generate geometry if there is no in the model
if (model.GeometriesCount == 0)
{
//create geometry
var m3D = new Xbim3DModelContext(model);
m3D.CreateContext(true);
}
//initialize octree with all the objects
var prods = model.Instances.OfType <IfcProduct>();
//Stopwatch sw = new Stopwatch();
//var report = new StringWriter();
//report.WriteLine("{0,-15}, {1,-40}, {2,5}, {3,5}", "Type", "Product name", "Geometry", "BBox");
//we need to preprocess all the products first to get world size. Will keep results to avoid repetition.
XbimRect3D worldBB = XbimRect3D.Empty;
foreach (var prod in prods)
{
//bounding boxes are lightweight and are produced when geometry is created at first place
//sw.Start();
var geom = prod.Geometry3D();
var trans = prod.ObjectPlacement.ToMatrix3D();
//sw.Stop();
//var geomGeneration = sw.ElapsedMilliseconds;
if (geom != null && geom.FirstOrDefault() != null)
{
//get or cast to BBox
//sw.Restart();
var bb = geom.GetAxisAlignedBoundingBox();
bb = new XbimRect3D(trans.Transform(bb.Min), trans.Transform(bb.Max));
//sw.Stop();
//var gettingBbox = sw.ElapsedMilliseconds;
//report.WriteLine("{0,-15}, {1,-40}, {2,5}, {3,5}", prod.GetType().Name, prod.Name, geomGeneration, gettingBbox);
//add every BBox to the world to get the size and position of the world
_prodBBs.Add(prod, bb);
if (!double.IsNaN(bb.SizeX))
{
worldBB.Union(bb);
}
//Debug.WriteLine("{0,-45} {1,10:F5} {2,10:F5} {3,10:F5} {4,10:F5} {5,10:F5} {6,10:F5}",
// prod.Name, bb.X, bb.Y, bb.Z, bb.SizeX, bb.SizeY, bb.SizeZ);
}
}
//Debug.WriteLine("{0,-45} {1,10:F5} {2,10:F5} {3,10:F5} {4,10:F5} {5,10:F5} {6,10:F5}",
// "World", worldBB.X, worldBB.Y, worldBB.Z, worldBB.SizeX, worldBB.SizeY, worldBB.SizeZ);
//create octree
//target size must depend on the units of the model
var meter = (float)model.ModelFactors.OneMetre;
var size = Math.Max(Math.Max(worldBB.SizeX, worldBB.SizeY), worldBB.SizeZ) + meter / 2f;
var shift = meter / 4f;
var position = worldBB.Location + new XbimVector3D()
{
X = size / 2f - shift, Y = size / 2f - shift, Z = size / 2f - shift
};
_tree = new XbimOctree <IfcProduct>(size, meter, 1f, position);
//sw.Restart();
//add every product to the world
foreach (var item in _prodBBs)
{
_tree.Add(item.Key, item.Value);
}
//sw.Stop();
//report.WriteLine("Generation of octree containing {0} products {1}", prods.Count(), sw.ElapsedMilliseconds);
}
