public byte[] Build()
{
var wdt = new WDT("World\\maps\\" + Dungeon + "\\" + Dungeon + ".wdt");
if (!wdt.IsGlobalModel || !wdt.IsValid)
return null;
Geometry = new Geometry.Geometry {};
var model = new WMORoot(wdt.ModelFile);
Geometry.AddDungeon(model, wdt.ModelDefinition);
if (Geometry.Vertices.Count == 0 && Geometry.Indices.Count == 0)
throw new InvalidOperationException("Can't build mesh with empty geometry");
Geometry.SaveWavefrontObject($"{Dungeon}.obj");
Context = new RecastContext();
// get raw geometry - lots of slowness here
float[] vertices;
int[] triangles;
byte[] areas;
Geometry.GetRawData(out vertices, out triangles, out areas);
Geometry.Indices.Clear();
float[] bmin, bmax;
Geometry.CalculateBoundingBox(out bmin, out bmax);
Geometry.Vertices.Clear();
// Allocate voxel heightfield where we rasterize our input data to.
Heightfield hf;
int width, height;
Recast.CalcGridSize(bmin, bmax, Config.CellSize, out width, out height);
if (!Context.CreateHeightfield(out hf, width, height, bmin, bmax, Config.CellSize, Config.CellHeight))
throw new OutOfMemoryException("CreateHeightfield ran out of memory");
// Find triangles which are walkable based on their slope and rasterize them.
Context.ClearUnwalkableTriangles(Config.WalkableSlopeAngle, ref vertices, ref triangles, areas);
Context.RasterizeTriangles(ref vertices, ref triangles, ref areas, hf, Config.WalkableClimb);
// Once all geometry is rasterized, we do initial pass of filtering to
// remove unwanted overhangs caused by the conservative rasterization
// as well as filter spans where the character cannot possibly stand.
Context.FilterLowHangingWalkableObstacles(Config.WalkableClimb, hf);
Context.FilterLedgeSpans(Config.WalkableHeight, Config.WalkableClimb, hf);
Context.FilterWalkableLowHeightSpans(Config.WalkableHeight, hf);
// Compact the heightfield so that it is faster to handle from now on.
// This will result in more cache coherent data as well as the neighbours
// between walkable cells will be calculated.
CompactHeightfield chf;
if (!Context.BuildCompactHeightfield(Config.WalkableHeight, Config.WalkableClimb, hf, out chf))
throw new OutOfMemoryException("BuildCompactHeightfield ran out of memory");
hf.Delete();
// Erode the walkable area by agent radius.
if (!Context.ErodeWalkableArea(Config.WalkableRadius, chf))
throw new OutOfMemoryException("ErodeWalkableArea ran out of memory");
// Prepare for region partitioning, by calculating distance field along the walkable surface.
if (!Context.BuildDistanceField(chf))
throw new OutOfMemoryException("BuildDistanceField ran out of memory");
// Partition the walkable surface into simple regions without holes.
if (!Context.BuildRegions(chf, Config.BorderSize, Config.MinRegionArea, Config.MergeRegionArea))
throw new OutOfMemoryException("BuildRegions ran out of memory");
// Create contours.
ContourSet cset;
if (!Context.BuildContours(chf, Config.MaxSimplificationError, Config.MaxEdgeLength, out cset))
throw new OutOfMemoryException("BuildContours ran out of memory");
// Build polygon navmesh from the contours.
PolyMesh pmesh;
if (!Context.BuildPolyMesh(cset, Config.MaxVertsPerPoly, out pmesh))
throw new OutOfMemoryException("BuildPolyMesh ran out of memory");
// Build detail mesh.
PolyMeshDetail dmesh;
if (!Context.BuildPolyMeshDetail(pmesh, chf, Config.DetailSampleDistance, Config.DetailSampleMaxError, out dmesh))
throw new OutOfMemoryException("BuildPolyMeshDetail ran out of memory");
chf.Delete();
cset.Delete();
// Set flags according to area types (e.g. Swim for Water)
pmesh.MarkAll();
byte[] meshData;
if (!Detour.CreateNavMeshData(out meshData, pmesh, dmesh, 0, 0, bmin, bmax, Config.WorldWalkableHeight, Config.WorldWalkableRadius, Config.WorldWalkableClimb, Config.CellSize, Config.CellHeight, Config.TileWidth, null))
{
pmesh.Delete();
dmesh.Delete();
return null;
}
pmesh.Delete();
dmesh.Delete();
if (Directory.Exists(Dungeon))
Directory.Delete(Dungeon, true);
Directory.CreateDirectory(Dungeon);
if (meshData != null)
File.WriteAllBytes(Dungeon + "\\" + Dungeon + ".dmesh", meshData);
return meshData;
}
