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Corrected a wrong behavior in case of a polychord having singularities on one side and a regular (ring) border on the other, which must not be collapsed.

This commit is contained in:
giorgiomarcias 2014-02-19 09:32:35 +00:00
parent 6f7e2872af
commit 4cc8a7c919
1 changed files with 25 additions and 15 deletions
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40
vcg/complex/algorithms/polygon_polychord_collapse.h
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@ -903,16 +903,15 @@ private:
assert(!pos.IsNull());
int valence = 0;
bool singSideA = false, singSideB = false;
bool borderA = false, borderB = false;
bool borderSideA = false, borderSideB = false;
bool polyBorderFound = false;
vcg::face::JumpingPos<FaceType> jmpPos;
startPos = pos;
// check if it is a quad
if (startPos.F()->VN() != 4)
return PC_NOTQUAD;
do {
// check if it is a quad
if (startPos.F()->VN() != 4)
return PC_NOTQUAD;
// check manifoldness
if (IsVertexAdjacentToAnyNonManifoldEdge(startPos))
return PC_NOTMANIF;
@ -921,6 +920,19 @@ private:
return PC_NOTMANIF;
startPos.FlipV();
// check if side A is on border
startPos.FlipE();
if (startPos.IsBorder())
borderSideA = true;
startPos.FlipE();
// check if side B is on border
startPos.FlipV();
startPos.FlipE();
if (startPos.IsBorder())
borderSideB = true;
startPos.FlipE();
startPos.FlipV();
// check if singularities are not in both sides
if (checkSing) {
// compute the valence of the vertex on side B
@ -928,30 +940,26 @@ private:
valence = startPos.NumberOfIncidentVertices();
// if the vertex is on border increment its valence by 1 (virtually connect it to a dummy vertex)
jmpPos.Set(startPos.F(), startPos.E(), startPos.V());
if (jmpPos.FindBorder()) {
borderB = true;
if (jmpPos.FindBorder())
valence++;
}
if (valence != 4)
singSideB = true;
// a 2-valence internl vertex cause a polychord to touch itself, producing non-2manifoldness
// in that case, a 2-valence vertex is dealt as 2 singularities in both sides
if (valence == 2 && !borderB)
if (valence == 2 && !borderSideB)
singSideA = true;
// compute the valence of the vertex on side A
startPos.FlipV();
valence = startPos.NumberOfIncidentVertices();
// if the vertex is on border increment its valence by 1 (virtually connect it to a dummy vertex)
jmpPos.Set(startPos.F(), startPos.E(), startPos.V());
if (jmpPos.FindBorder()) {
borderA = true;
if (jmpPos.FindBorder())
valence++;
}
if (valence != 4)
singSideA = true;
// a 2-valence internal vertex cause a polychord to touch itself, producing non-2manifoldness
// in that case, a 2-valence vertex is dealt as 2 singularities in both sides
if (valence == 2 && !borderA)
if (valence == 2 && !borderSideA)
singSideB = true;
}
@ -982,11 +990,13 @@ private:
} while (startPos != pos);
// polychord with singularities on both sides can not collapse
if (singSideA && singSideB)
if ((singSideA && singSideB) ||
(singSideA && borderSideB) ||
(singSideB && borderSideA))
return PC_SINGBOTH;
// polychords that are rings and have borders on both sides can not collapse
if (!polyBorderFound && borderA && borderB)
if (!polyBorderFound && borderSideA && borderSideB)
return PC_SINGBOTH;
return PC_SUCCESS;