// loop through submesh border edges on basemesh, map to submesh, and
// pin those edges / vertices
public static void FixSubmeshBoundaryEdges(MeshConstraints cons, DSubmesh3 sub)
{
Debug.Assert(sub.BaseBorderE != null);
foreach (int base_eid in sub.BaseBorderE)
{
Index2i base_ev = sub.BaseMesh.GetEdgeV(base_eid);
Index2i sub_ev = sub.MapVerticesToSubmesh(base_ev);
int sub_eid = sub.SubMesh.FindEdge(sub_ev.a, sub_ev.b);
Debug.Assert(sub_eid != NGonsCore.geometry3Sharp.mesh.DMesh3.InvalidID);
Debug.Assert(sub.SubMesh.IsBoundaryEdge(sub_eid));
cons.SetOrUpdateEdgeConstraint(sub_eid, EdgeConstraint.FullyConstrained);
cons.SetOrUpdateVertexConstraint(sub_ev.a, VertexConstraint.Pinned);
cons.SetOrUpdateVertexConstraint(sub_ev.b, VertexConstraint.Pinned);
}
}
// for all mesh boundary edges, disable flip/split/collapse
// for all mesh boundary vertices, pin in current position
public static void FixAllBoundaryEdges(MeshConstraints cons, NGonsCore.geometry3Sharp.mesh.DMesh3 mesh)
{
int NE = mesh.MaxEdgeID;
for (int ei = 0; ei < NE; ++ei)
{
if (mesh.IsEdge(ei) && mesh.IsBoundaryEdge(ei))
{
cons.SetOrUpdateEdgeConstraint(ei, EdgeConstraint.FullyConstrained);
Index2i ev = mesh.GetEdgeV(ei);
cons.SetOrUpdateVertexConstraint(ev.a, VertexConstraint.Pinned);
cons.SetOrUpdateVertexConstraint(ev.b, VertexConstraint.Pinned);
}
}
}
// for all vertices in loopV, constrain to target
// for all edges in loopV, disable flips and constrain to target
public static void ConstrainVtxLoopTo(MeshConstraints cons, NGonsCore.geometry3Sharp.mesh.DMesh3 mesh, int[] loopV, IProjectionTarget target, int setID = -1)
{
VertexConstraint vc = new VertexConstraint(target);
for (int i = 0; i < loopV.Length; ++i)
{
cons.SetOrUpdateVertexConstraint(loopV[i], vc);
}
EdgeConstraint ec = new EdgeConstraint(EdgeRefineFlags.NoFlip, target);
ec.TrackingSetID = setID;
for (int i = 0; i < loopV.Length; ++i)
{
int v0 = loopV[i];
int v1 = loopV[(i + 1) % loopV.Length];
int eid = mesh.FindEdge(v0, v1);
Debug.Assert(eid != NGonsCore.geometry3Sharp.mesh.DMesh3.InvalidID);
if (eid != NGonsCore.geometry3Sharp.mesh.DMesh3.InvalidID)
{
cons.SetOrUpdateEdgeConstraint(eid, ec);
}
}
}
// After we split an edge, we have created a new edge and a new vertex.
// The edge needs to inherit the constraint on the other pre-existing edge that we kept.
// In addition, if the edge vertices were both constrained, then we /might/
// want to also constrain this new vertex, possibly project to constraint target.
void update_after_split(int edgeID, int va, int vb, NGonsCore.geometry3Sharp.mesh.DMesh3.EdgeSplitInfo splitInfo)
{
bool bPositionFixed = false;
if (constraints != null && constraints.HasEdgeConstraint(edgeID))
{
// inherit edge constraint
constraints.SetOrUpdateEdgeConstraint(splitInfo.eNewBN, constraints.GetEdgeConstraint(edgeID));
// [RMS] update vertex constraints. Note that there is some ambiguity here.
// Both verts being constrained doesn't inherently mean that the edge is on
// a constraint, that's why these checks are only applied if edge is constrained.
// But constrained edge doesn't necessarily mean we want to inherit vert constraints!!
//
// although, pretty safe to assume that we would at least disable flips
// if both vertices are constrained to same line/curve. So, maybe this makes sense...
//
// (perhaps edge constraint should be explicitly tagged to resolve this ambiguity??)
// vert inherits Fixed if both orig edge verts Fixed, and both tagged with same SetID
VertexConstraint ca = constraints.GetVertexConstraint(va);
VertexConstraint cb = constraints.GetVertexConstraint(vb);
if (ca.Fixed && cb.Fixed)
{
int nSetID = (ca.FixedSetID > 0 && ca.FixedSetID == cb.FixedSetID) ?
ca.FixedSetID : VertexConstraint.InvalidSetID;
constraints.SetOrUpdateVertexConstraint(splitInfo.vNew,
new VertexConstraint(true, nSetID));
bPositionFixed = true;
}
// vert inherits Target if both source verts and edge have same Target
if (ca.Target != null && ca.Target == cb.Target &&
constraints.GetEdgeConstraint(edgeID).Target == ca.Target)
{
constraints.SetOrUpdateVertexConstraint(splitInfo.vNew,
new VertexConstraint(ca.Target));
project_vertex(splitInfo.vNew, ca.Target);
bPositionFixed = true;
}
}
if (EnableInlineProjection && bPositionFixed == false && target != null)
{
project_vertex(splitInfo.vNew, target);
}
}
// for all mesh boundary vertices, pin in current position, but allow collapses
public static void FixAllBoundaryEdges_AllowCollapse(MeshConstraints cons, NGonsCore.geometry3Sharp.mesh.DMesh3 mesh, int setID)
{
EdgeConstraint edgeCons = new EdgeConstraint(EdgeRefineFlags.NoFlip | EdgeRefineFlags.NoSplit);
VertexConstraint vertCons = new VertexConstraint(true, setID);
int NE = mesh.MaxEdgeID;
for (int ei = 0; ei < NE; ++ei)
{
if (mesh.IsEdge(ei) && mesh.IsBoundaryEdge(ei))
{
cons.SetOrUpdateEdgeConstraint(ei, edgeCons);
Index2i ev = mesh.GetEdgeV(ei);
cons.SetOrUpdateVertexConstraint(ev.a, vertCons);
cons.SetOrUpdateVertexConstraint(ev.b, vertCons);
}
}
}