protected void merge_loops(DMesh3 mesh, EdgeLoop cutLoop, EdgeLoop connectorLoop, bool is_outer)
{
/*
* To join the loops, we are going to first make a circle, then snap both
* open loops to that circle. Then we sample a set of vertices on the circle
* and remesh the loops while also snapping them to the circle vertices.
* The result is two perfectly-matching edge loops.
*/
//AxisAlignedBox3d cutLoopBounds =
// BoundsUtil.Bounds(cutLoop.Vertices, (vid) => { return mesh.GetVertex(vid); });
AxisAlignedBox3d cutLoopBounds = cutLoop.GetBounds();
AxisAlignedBox3d connectorLoopBounds = connectorLoop.GetBounds();
Vector3d midPt = (cutLoopBounds.Center + connectorLoopBounds.Center) * 0.5;
double midY = midPt.y;
// this mess construcst the circle and the sampled version
Frame3f circFrame = new Frame3f(midPt);
Circle3d circ = new Circle3d(circFrame, connectorLoopBounds.Width * 0.5, 1);
DistPoint3Circle3 dist = new DistPoint3Circle3(Vector3d.Zero, circ);
DCurve3 sampled = new DCurve3();
double target_edge_len = TargetMeshEdgeLength;
int N = (int)(circ.ArcLength / target_edge_len);
for (int k = 0; k < N; ++k)
{
sampled.AppendVertex(circ.SampleT((double)k / (double)N));
}
MergeProjectionTarget circleTarget = new MergeProjectionTarget()
{
Mesh = mesh, CircleDist = dist, CircleLoop = sampled
};
EdgeLoop[] loops = new EdgeLoop[2] {
cutLoop, connectorLoop
};
EdgeLoop[] outputLoops = new EdgeLoop[2]; // loops after this remeshing/etc (but might be missing some verts/edges!)
for (int li = 0; li < 2; ++li)
{
EdgeLoop loop = loops[li];
// snap the loop verts onto the analytic circle
foreach (int vid in loop.Vertices)
{
Vector3d v = mesh.GetVertex(vid);
dist.Point = new Vector3d(v.x, midY, v.z);
mesh.SetVertex(vid, dist.Compute().CircleClosest);
}
if (DebugStep <= 5)
{
continue;
}
// remesh around the edge loop while we snap it to the sampled circle verts
EdgeLoopRemesher loopRemesh = new EdgeLoopRemesher(mesh, loop)
{
LocalSmoothingRings = 3
};
loopRemesh.EnableParallelProjection = false;
loopRemesh.SetProjectionTarget(circleTarget);
loopRemesh.SetTargetEdgeLength(TargetMeshEdgeLength);
loopRemesh.SmoothSpeedT = 0.5f;
for (int k = 0; k < 5; ++k)
{
loopRemesh.BasicRemeshPass();
}
loopRemesh.SmoothSpeedT = 0;
for (int k = 0; k < 2; ++k)
{
loopRemesh.BasicRemeshPass();
}
EdgeLoop newLoop = loopRemesh.OutputLoop;
outputLoops[li] = newLoop;
if (DebugStep <= 6)
{
continue;
}
// hard snap the loop vertices to the sampled circle verts
foreach (int vid in newLoop.Vertices)
{
Vector3d v = mesh.GetVertex(vid);
v = circleTarget.Project(v, vid);
mesh.SetVertex(vid, v);
}
// [TODO] we could re-order newLoop verts/edges to match the sampled verts order,
// then the pair of loops would be consistently ordered (currently no guarantee)
if (DebugStep <= 7)
{
continue;
}
// collapse any degenerate edges on loop (just in case)
// DANGER: if this actually happens, then outputLoops[li] has some invalid verts/edges!
foreach (int eid in newLoop.Edges)
{
if (mesh.IsEdge(eid))
{
Index2i ev = mesh.GetEdgeV(eid);
Vector3d a = mesh.GetVertex(ev.a), b = mesh.GetVertex(ev.b);
if (a.Distance(b) < TargetMeshEdgeLength * 0.001)
{
DMesh3.EdgeCollapseInfo collapse;
mesh.CollapseEdge(ev.a, ev.b, out collapse);
}
}
}
}
if (DebugStep <= 7)
{
return;
}
/*
* Ok now we want to merge the loops and make them nice
*/
// would be more efficient to find loops and stitch them...
MergeCoincidentEdges merge = new MergeCoincidentEdges(mesh);
merge.Apply();
// fill any fail-holes??
// remesh merge region
MeshVertexSelection remesh_roi_v = new MeshVertexSelection(mesh);
remesh_roi_v.Select(outputLoops[0].Vertices);
remesh_roi_v.Select(outputLoops[1].Vertices);
remesh_roi_v.ExpandToOneRingNeighbours(5);
MeshFaceSelection remesh_roi = new MeshFaceSelection(mesh, remesh_roi_v, 1);
remesh_roi.LocalOptimize(true, true);
IProjectionTarget projTarget = null;
if (is_outer)
{
projTarget = new NoPenetrationProjectionTarget()
{
Spatial = this.OuterOffsetMeshSpatial
};
}
else
{
projTarget = new NoPenetrationProjectionTarget()
{
Spatial = this.InnerOffsetMeshSpatial
};
}
RegionRemesher join_remesh =
RegionRemesher.QuickRemesh(mesh, remesh_roi.ToArray(), TargetMeshEdgeLength, 0.5, 5, projTarget);
if (DebugStep <= 8)
{
return;
}
if (false && is_outer)
{
Func <int, bool> filterF = (tid) => {
return(mesh.GetTriCentroid(tid).y > connectorLoopBounds.Max.y);
};
MeshFaceSelection tris = new MeshFaceSelection(mesh);
foreach (int tid in join_remesh.CurrentBaseTriangles)
{
if (filterF(tid))
{
tris.Select(tid);
}
}
tris.ExpandToOneRingNeighbours(5, filterF);
MeshVertexSelection verts = new MeshVertexSelection(mesh, tris);
MeshIterativeSmooth smooth = new MeshIterativeSmooth(mesh, verts.ToArray(), true);
smooth.Alpha = 1.0f;
smooth.Rounds = 25;
smooth.ProjectF = (v, n, vid) => { return(projTarget.Project(v)); };
smooth.Smooth();
}
// [RMS] this smooths too far. we basically only want to smooth 'up' from top of socket...
//LaplacianMeshSmoother.RegionSmooth(mesh, join_remesh.CurrentBaseTriangles, 1, 10);
// need to post-enforce thickness, which we aren't doing above - we could though
}