// 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, 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);
}
}
void add_split_subfaces(Index2i origTris, ref DMesh3.EdgeSplitInfo splitInfo)
{
int parent_1 = get_parent(origTris.a);
HashSet <int> subfaces_1 = get_subfaces(parent_1);
if (origTris.a != parent_1)
{
add_subface(subfaces_1, parent_1, origTris.a);
}
add_subface(subfaces_1, parent_1, splitInfo.eNewT2);
if (origTris.b != DMesh3.InvalidID)
{
int parent_2 = get_parent(origTris.b);
HashSet <int> subfaces_2 = get_subfaces(parent_2);
if (origTris.b != parent_2)
{
add_subface(subfaces_2, parent_2, origTris.b);
}
add_subface(subfaces_2, parent_2, splitInfo.eNewT3);
}
}
protected override void OnEdgeSplit(int edgeID, int va, int vb, DMesh3.EdgeSplitInfo splitInfo)
{
int aidx = CurrentLoopV.FindIndex((i) => { return(i == va); });
int bidx = CurrentLoopV.FindIndex((i) => { return(i == vb); });
int eidx = CurrentLoopE.FindIndex((i) => { return(i == edgeID); });
if (eidx == CurrentLoopE.Count - 1) // list-wrap case
{
CurrentLoopV.Add(splitInfo.vNew);
}
else if (aidx < bidx)
{
CurrentLoopV.Insert(bidx, splitInfo.vNew);
}
else
{
CurrentLoopV.Insert(aidx, splitInfo.vNew);
}
// ugh! expensive!
rebuild_edge_list();
Debug.Assert(check_loop());
}
// subclasses can override these to implement custom behavior...
protected virtual void OnEdgeSplit(int edgeID, int va, int vb, DMesh3.EdgeSplitInfo splitInfo)
{
// this is for subclasses...
}