/// <summary>
/// Apply a bevel to a set of edges.
/// </summary>
/// <param name="mesh">Target mesh.</param>
/// <param name="edges">A set of edges to apply bevelling to.</param>
/// <param name="amount">A value from 0 (bevel not at all) to 1 (bevel entire face).</param>
/// <returns>The new faces created to form the bevel.</returns>
public static List <Face> BevelEdges(ProBuilderMesh mesh, IList <Edge> edges, float amount)
{
if (mesh == null)
{
throw new ArgumentNullException("mesh");
}
Dictionary <int, int> lookup = mesh.sharedVertexLookup;
List <Vertex> vertices = new List <Vertex>(mesh.GetVertices());
List <EdgeLookup> m_edges = EdgeLookup.GetEdgeLookup(edges, lookup).Distinct().ToList();
List <WingedEdge> wings = WingedEdge.GetWingedEdges(mesh);
List <FaceRebuildData> appendFaces = new List <FaceRebuildData>();
Dictionary <Face, List <int> > ignore = new Dictionary <Face, List <int> >();
HashSet <int> slide = new HashSet <int>();
int beveled = 0;
Dictionary <int, List <SimpleTuple <FaceRebuildData, List <int> > > > holes = new Dictionary <int, List <SimpleTuple <FaceRebuildData, List <int> > > >();
// test every edge that will be moved along to make sure the bevel distance is appropriate. if it's not, adjust the max bevel amount
// to suit.
Dictionary <int, List <WingedEdge> > spokes = WingedEdge.GetSpokes(wings);
HashSet <int> tested_common = new HashSet <int>();
foreach (EdgeLookup e in m_edges)
{
if (tested_common.Add(e.common.a))
{
foreach (WingedEdge w in spokes[e.common.a])
{
Edge le = w.edge.local;
amount = Mathf.Min(Vector3.Distance(vertices[le.a].position, vertices[le.b].position) - .001f, amount);
}
}
if (tested_common.Add(e.common.b))
{
foreach (WingedEdge w in spokes[e.common.b])
{
Edge le = w.edge.local;
amount = Mathf.Min(Vector3.Distance(vertices[le.a].position, vertices[le.b].position) - .001f, amount);
}
}
}
if (amount < .001f)
{
Log.Info("Bevel Distance > Available Surface");
return(null);
}
// iterate selected edges and move each leading edge back along it's direction
// storing information about adjacent faces in the process
foreach (EdgeLookup lup in m_edges)
{
WingedEdge we = wings.FirstOrDefault(x => x.edge.Equals(lup));
if (we == null || we.opposite == null)
{
continue;
}
beveled++;
ignore.AddOrAppend(we.face, we.edge.common.a);
ignore.AddOrAppend(we.face, we.edge.common.b);
ignore.AddOrAppend(we.opposite.face, we.edge.common.a);
ignore.AddOrAppend(we.opposite.face, we.edge.common.b);
// after initial slides go back and split indirect triangles at the intersecting index into two vertices
slide.Add(we.edge.common.a);
slide.Add(we.edge.common.b);
SlideEdge(vertices, we, amount);
SlideEdge(vertices, we.opposite, amount);
appendFaces.AddRange(GetBridgeFaces(vertices, we, we.opposite, holes));
}
if (beveled < 1)
{
Log.Info("Cannot Bevel Open Edges");
return(null);
}
// grab the "createdFaces" array now so that the selection returned is just the bridged faces
// then add holes later
var createdFaces = new List <Face>(appendFaces.Select(x => x.face));
Dictionary <Face, List <SimpleTuple <WingedEdge, int> > > sorted = new Dictionary <Face, List <SimpleTuple <WingedEdge, int> > >();
// sort the adjacent but affected faces into winged edge groups where each group contains a set of
// unique winged edges pointing to the same face
foreach (int c in slide)
{
IEnumerable <WingedEdge> matches = wings.Where(x => x.edge.common.Contains(c) && !(ignore.ContainsKey(x.face) && ignore[x.face].Contains(c)));
HashSet <Face> used = new HashSet <Face>();
foreach (WingedEdge match in matches)
{
if (!used.Add(match.face))
{
continue;
}
sorted.AddOrAppend(match.face, new SimpleTuple <WingedEdge, int>(match, c));
}
}
// now go through those sorted faces and apply the vertex exploding, keeping track of any holes created
foreach (KeyValuePair <Face, List <SimpleTuple <WingedEdge, int> > > kvp in sorted)
{
// common index & list of vertices it was split into
Dictionary <int, List <int> > appended;
FaceRebuildData f = VertexEditing.ExplodeVertex(vertices, kvp.Value, amount, out appended);
if (f == null)
{
continue;
}
appendFaces.Add(f);
foreach (var apv in appended)
{
// organize holes by new face so that later we can compare the winding of the new face to the hole face
// holes are sorted by key: common index value: face, vertex list
holes.AddOrAppend(apv.Key, new SimpleTuple <FaceRebuildData, List <int> >(f, apv.Value));
}
}
FaceRebuildData.Apply(appendFaces, mesh, vertices);
int removed = mesh.DeleteFaces(sorted.Keys).Length;
mesh.sharedTextures = new SharedVertex[0];
mesh.sharedVertices = SharedVertex.GetSharedVerticesWithPositions(mesh.positionsInternal);
// @todo don't rebuild indexes, keep 'em cached
SharedVertex[] sharedIndexes = mesh.sharedVerticesInternal;
lookup = mesh.sharedVertexLookup;
List <HashSet <int> > holesCommonIndexes = new List <HashSet <int> >();
// offset the indexes of holes and cull any potential holes that are less than 3 indexes (not a hole :)
foreach (KeyValuePair <int, List <SimpleTuple <FaceRebuildData, List <int> > > > hole in holes)
{
// less than 3 indexes in hole path; ain't a hole
if (hole.Value.Sum(x => x.item2.Count) < 3)
{
continue;
}
HashSet <int> holeCommon = new HashSet <int>();
foreach (SimpleTuple <FaceRebuildData, List <int> > path in hole.Value)
{
int offset = path.item1.Offset() - removed;
for (int i = 0; i < path.item2.Count; i++)
{
holeCommon.Add(lookup[path.item2[i] + offset]);
}
}
holesCommonIndexes.Add(holeCommon);
}
List <WingedEdge> modified = WingedEdge.GetWingedEdges(mesh, appendFaces.Select(x => x.face));
// now go through the holes and create faces for them
vertices = new List <Vertex>(mesh.GetVertices());
List <FaceRebuildData> holeFaces = new List <FaceRebuildData>();
foreach (HashSet <int> h in holesCommonIndexes)
{
// even if a set of hole indexes made it past the initial culling, the distinct part
// may have reduced the index count
if (h.Count < 3)
{
continue;
}
// skip sorting the path if it's just a triangle
if (h.Count < 4)
{
List <Vertex> v = new List <Vertex>(mesh.GetVertices(h.Select(x => sharedIndexes[x][0]).ToList()));
holeFaces.Add(AppendElements.FaceWithVertices(v));
}
// if this hole has > 3 indexes, it needs a tent pole triangulation, which requires sorting into the perimeter order
else
{
List <int> holePath = WingedEdge.SortCommonIndexesByAdjacency(modified, h);
List <Vertex> v = new List <Vertex>(mesh.GetVertices(holePath.Select(x => sharedIndexes[x][0]).ToList()));
holeFaces.AddRange(AppendElements.TentCapWithVertices(v));
}
}
FaceRebuildData.Apply(holeFaces, mesh, vertices);
mesh.sharedVertices = SharedVertex.GetSharedVerticesWithPositions(mesh.positionsInternal);
// go through new faces and conform hole normals
// get a hash of just the adjacent and bridge faces
// HashSet<pb_Face> adjacent = new HashSet<pb_Face>(appendFaces.Select(x => x.face));
// and also just the filled holes
HashSet <Face> newHoles = new HashSet <Face>(holeFaces.Select(x => x.face));
// now append filled holes to the full list of added faces
appendFaces.AddRange(holeFaces);
List <WingedEdge> allNewFaceEdges = WingedEdge.GetWingedEdges(mesh, appendFaces.Select(x => x.face));
for (int i = 0; i < allNewFaceEdges.Count && newHoles.Count > 0; i++)
{
WingedEdge wing = allNewFaceEdges[i];
if (newHoles.Contains(wing.face))
{
newHoles.Remove(wing.face);
// find first edge whose opposite face isn't a filled hole* then
// conform normal by that.
// *or is a filled hole but has already been conformed
using (var it = new WingedEdgeEnumerator(wing))
{
while (it.MoveNext())
{
var w = it.Current;
if (!newHoles.Contains(w.opposite.face))
{
w.face.submeshIndex = w.opposite.face.submeshIndex;
w.face.uv = new AutoUnwrapSettings(w.opposite.face.uv);
SurfaceTopology.ConformOppositeNormal(w.opposite);
break;
}
}
}
}
}
mesh.ToMesh();
return(createdFaces);
}