public static Mesh BuildMesh(List <CSGNode> nodes)
{
Mesh mesh = new Mesh();
CSGTree tree = new CSGTree();
tree.RootNode = CreateTree(nodes);
var updateNodes = CSGUtility.FindChildBrushes(tree);
var modifiedMeshes = CSGCategorization.ProcessCSGNodes(tree.RootNode, updateNodes);
Dictionary <CSGNode, CSGMesh> validMeshes = new Dictionary <CSGNode, CSGMesh>();
foreach (var item in modifiedMeshes)
{
validMeshes[item.Key] = item.Value;
}
Vector4[] vertices = new Vector4[65535];
int[] polyIndices = new int[65535 * 4];
int[] lineIndices = new int[65535 * 3];
Dictionary <Vector4, int> vertexLookup = new Dictionary <Vector4, int>();
int[] vertexIndexLookup = new int[65535];
int vertexCount;
int polyIndexCount;
int lineIndexCount;
CreateListsFromMeshes(vertexLookup, vertexIndexLookup, validMeshes, vertices, out vertexCount, polyIndices, out polyIndexCount, lineIndices, out lineIndexCount);
Vector4[] verts = new Vector4[vertexCount];
int[] indicies = new int[polyIndexCount];
Array.Copy(vertices, verts, verts.Length);
Array.Copy(polyIndices, indicies, indicies.Length);
mesh.Vertices = verts;
mesh.Indicies = indicies;
return(mesh);
}
public static ConcurrentDictionary <CSGNode, CSGMesh> ProcessCSGNodes(CSGNode root, IEnumerable <CSGNode> nodes)
{
var meshes = new ConcurrentDictionary <CSGNode, CSGMesh>();
var buildMesh =
(Action <CSGNode>)
delegate(CSGNode node)
{
CSGMesh mesh;
if (!cachedBaseMeshes.TryGetValue(node, out mesh))
{
// If the node we're performing csg on is a brush, we simply create the geometry from the planes
// If the node is a more complicated node, we perform csg on it's child nodes and combine the
// meshes that are created.
// Note that right now we cache brushes per node, but we can improve on this by caching on
// node type instead. Since lots of nodes will have the same geometry in real life and only
// need to be created once. It won't help much in runtime performance considering they're
// cached anyway, but it'll save on memory usage.
if (node.NodeType != CSGNodeType.Brush)
{
var childNodes = CSGUtility.FindChildBrushes(node);
var brushMeshes = ProcessCSGNodes(node, childNodes);
mesh = CSGMesh.Combine(node.Translation, brushMeshes);
}
else
{
mesh = CSGMesh.CreateFromPlanes(node.Planes);
}
// Cache the mesh
cachedBaseMeshes[node] = mesh;
}
// Clone the cached mesh so we can perform CSG on it.
var clonedMesh = mesh.Clone();
node.Bounds.Set(clonedMesh.Bounds);
meshes[node] = clonedMesh;
};
var updateDelegate =
(Action <KeyValuePair <CSGNode, CSGMesh> >)
delegate(KeyValuePair <CSGNode, CSGMesh> item)
{
var processedNode = item.Key;
var processedMesh = item.Value;
var inputPolygons = processedMesh.Polygons;
var insidePolygons = new List <Polygon>(inputPolygons.Count);
var outsidePolygons = new List <Polygon>(inputPolygons.Count);
var alignedPolygons = new List <Polygon>(inputPolygons.Count);
var reversedPolygons = new List <Polygon>(inputPolygons.Count);
CSGCategorization.Categorize(processedNode,
processedMesh,
root,
inputPolygons, // these are the polygons that are categorized
insidePolygons,
alignedPolygons,
reversedPolygons,
outsidePolygons
);
// Flag all non aligned polygons as being invisible, and store their categorizations
// so we can use it if we instance this mesh.
foreach (var polygon in insidePolygons)
{
polygon.Category = PolygonCategory.Inside;
polygon.Visible = false;
}
foreach (var polygon in outsidePolygons)
{
polygon.Category = PolygonCategory.Outside;
polygon.Visible = false;
}
foreach (var polygon in alignedPolygons)
{
polygon.Category = PolygonCategory.Aligned;
}
foreach (var polygon in reversedPolygons)
{
polygon.Category = PolygonCategory.ReverseAligned;
}
};
//
// Here we run build the meshes and perform csg on them either in serial or parallel
//
/*
* foreach (var node in nodes)
* buildMesh(node);
* CSGUtility.UpdateBounds(root);
* foreach (var item in meshes)
* updateDelegate(item);
* /*/
Parallel.ForEach(nodes, buildMesh);
CSGUtility.UpdateBounds(root);
Parallel.ForEach(meshes, updateDelegate);
//*/
return(meshes);
}
