static
bool SplitSeam( ON_Brep& brep,
ON_BrepTrim& trimA, ON_BrepTrim& trimB,
ON_BrepTrim& prevtrimB,
ON_BrepTrim& nexttrimB,
int vcount0 // number of verts before singular fixups
)
{
if ( trimA.m_trim_index == trimB.m_trim_index )
return false;
if ( trimA.m_trim_index == prevtrimB.m_trim_index )
return false;
if ( trimA.m_trim_index == nexttrimB.m_trim_index )
return false;
if ( trimB.m_trim_index == prevtrimB.m_trim_index )
return false;
if ( trimB.m_trim_index == nexttrimB.m_trim_index )
return false;
if ( prevtrimB.m_trim_index == nexttrimB.m_trim_index )
return false;
if ( trimA.m_type != ON_BrepTrim::seam )
return false;
if ( trimB.m_type != ON_BrepTrim::seam )
return false;
if ( trimA.m_ei != trimB.m_ei )
return false;
if ( trimA.m_vi[0] != trimB.m_vi[1]
&& trimA.m_vi[0] < vcount0
&& trimB.m_vi[1] < vcount0 )
return false;
if ( trimA.m_vi[1] != trimB.m_vi[0]
&& trimA.m_vi[1] < vcount0
&& trimB.m_vi[0] < vcount0 )
return false;
if ( prevtrimB.m_vi[1] != trimB.m_vi[0]
&& prevtrimB.m_vi[1] < vcount0
&& trimB.m_vi[0] < vcount0 )
return false;
if ( nexttrimB.m_vi[0] != trimB.m_vi[1]
&& prevtrimB.m_vi[0] < vcount0
&& trimB.m_vi[1] < vcount0 )
return false;
if ( trimA.m_li != trimB.m_li )
return false;
if ( trimA.m_li != prevtrimB.m_li )
return false;
if ( trimA.m_li != nexttrimB.m_li )
return false;
if ( trimA.m_bRev3d == trimB.m_bRev3d )
return false;
const ON_Surface* srf = trimA.SurfaceOf();
if ( 0 == srf )
return false;
ON_BrepEdge* edgeA = brep.Edge(trimA.m_ei);
if ( 0 == edgeA )
return false;
if ( edgeA->m_ti.Count() != 2 )
return false;
if ( edgeA->m_ti[0] != trimA.m_trim_index && edgeA->m_ti[1] != trimA.m_trim_index )
return false;
if ( edgeA->m_ti[0] != trimB.m_trim_index && edgeA->m_ti[1] != trimB.m_trim_index )
return false;
// reserve space now so the vA0 and vA1 pointers
// will be valid if m_V[] is grown.
brep.m_V.Reserve( brep.m_V.Count()+2 );
ON_BrepVertex* vA0 = brep.Vertex(trimA.m_vi[0]);
if ( 0 == vA0 )
return false;
ON_BrepVertex* vA1 = brep.Vertex(trimA.m_vi[1]);
if ( 0 == vA1 )
return false;
// looks like we have a valid seam to blow apart
// get a new 3d curve for trimB
ON_Curve* cB3 = PushUpIsoTrim( brep, trimB );
if ( 0 == cB3 )
return false;
int c3i = brep.AddEdgeCurve(cB3);
vA0->m_tolerance = ON_UNSET_VALUE;
vA1->m_tolerance = ON_UNSET_VALUE;
// make new vertices for trimB
ON_BrepVertex* vB0 = 0;
ON_BrepVertex* vB1 = 0;
ON_3dPoint PA, PB;
bool bSame = false;
if (brep.GetTrim3dStart(trimB.m_trim_index, PB) && brep.GetTrim3dEnd(trimA.m_trim_index, PA))
bSame = PB.DistanceTo(PA) < ON_ZERO_TOLERANCE;
if (bSame || trimB.m_vi[0] != trimA.m_vi[1] )
{
// sing fixups have already blown apart this end
vB0 = brep.Vertex( trimB.m_vi[0] );
}
bSame = false;
if (brep.GetTrim3dStart(trimA.m_trim_index, PA) && brep.GetTrim3dEnd(trimB.m_trim_index, PB))
bSame = PB.DistanceTo(PA) < ON_ZERO_TOLERANCE;
if (bSame || trimB.m_vi[1] != trimA.m_vi[0] )
{
// sing fixups have already blown apart this end
vB1 = brep.Vertex( trimB.m_vi[1] );
}
if ( 0 == vB0 )
{
ON_BrepVertex& v = brep.NewVertex();
vB0 = &v;
trimB.m_vi[0] = vB0->m_vertex_index;
}
if ( 0 == vB1 )
{
ON_BrepVertex& v = brep.NewVertex();
vB1 = &v;
trimB.m_vi[1] = vB1->m_vertex_index;
}
// disconnect edgeA and trimB
trimB.m_ei = -1;
if ( edgeA->m_ti[0] == trimB.m_trim_index )
edgeA->m_ti.Remove(0);
else if ( edgeA->m_ti[1] == trimB.m_trim_index )
edgeA->m_ti.Remove(1);
ChangeTrimVertex( brep, trimB, 0, vA1->m_vertex_index, vB0->m_vertex_index, true, true );
ChangeTrimVertex( brep, trimB, 1, vA0->m_vertex_index, vB1->m_vertex_index, true, true );
ChangeTrimVertex( brep, prevtrimB, 1, vA1->m_vertex_index, vB0->m_vertex_index, true, true );
ChangeTrimVertex( brep, nexttrimB, 0, vA0->m_vertex_index, vB1->m_vertex_index, true, true );
// make a new edgeB and connect it to trimB
ON_BrepEdge& edgeB = brep.NewEdge( *vB0, *vB1, c3i );
edgeA = 0; // pointer may be invalid after m_E[] grows
edgeB.m_ti.Append(trimB.m_trim_index);
trimB.m_ei = edgeB.m_edge_index;
trimB.m_bRev3d = false;
trimA.m_type = ON_BrepTrim::boundary;
trimB.m_type = ON_BrepTrim::boundary;
return true;
}
static
bool ChangeTrimSingToBdry( ON_Brep& brep, ON_BrepTrim& trim, ON_BrepTrim* nexttrim )
{
if ( trim.m_vi[0] != trim.m_vi[1] )
return false;
if ( trim.m_type != ON_BrepTrim::singular )
return false;
if ( trim.m_ei >= 0 )
return false;
const ON_Surface* srf = trim.SurfaceOf();
if ( 0 == srf )
return false;
brep.m_V.Reserve( brep.m_V.Count() + 1 );
ON_BrepVertex* v0 = brep.Vertex(trim.m_vi[0]);
if ( 0 == v0 )
return false;
// get new 3d curve
ON_Curve* c3 = PushUpIsoTrim( brep, trim );
if ( 0 == c3 )
return false;
// valid singular trim can be changed to non-singular trim
// create new vertex for end of this trim
v0->m_tolerance = ON_UNSET_VALUE;
ON_BrepVertex* v1 = 0;
if ( c3->IsClosed() )
{
// 3d edge is closed so start and end vertex are still the same.
v1 = v0;
}
else
{
// new 3d edge is not closed, so the single singular vertex
// needs to be "split" into two vertices.
brep.NewVertex();
v1 = brep.m_V.Last();
}
trim.m_vi[1] = v1->m_vertex_index;
// update the start of the next trim to use new vertex
if ( nexttrim && nexttrim->m_trim_index != trim.m_trim_index )
{
ChangeTrimVertex( brep, *nexttrim, 0, v0->m_vertex_index, v1->m_vertex_index, true, true );
}
// make a new edge
int ci = brep.AddEdgeCurve(c3);
c3 = 0;
ON_BrepEdge& edge = brep.NewEdge(*v0,*v1,ci);
edge.m_tolerance = 0.0;
// hook trim to new edge
trim.m_type = ON_BrepTrim::boundary;
trim.m_bRev3d = false;
trim.m_ei = edge.m_edge_index;
edge.m_ti.Append(trim.m_trim_index);
return true;
}