bool ON_Surface::IsSolid() const
{
const bool bIsClosed0 = ( IsClosed(0) || ( IsSingular(1) && IsSingular(3) ) );
const bool bIsClosed1 = ( IsClosed(1) || ( IsSingular(0) && IsSingular(2) ) );
if ( bIsClosed0 && bIsClosed1 )
return true;
const ON_Extrusion* extrusion = ON_Extrusion::Cast(this);
if ( 0 != extrusion && extrusion->IsSolid() )
return true;
return false;
}
bool ON_NurbsSurface::Morph( const ON_SpaceMorph& morph )
{
DestroySurfaceTree();
ON_BOOL32 bIsClosed[2];
ON_BOOL32 bIsPeriodic[2];
ON_BOOL32 bIsSingular[4];
int i;
for ( i = 0; i < 2; i++ )
{
bIsClosed[i] = IsClosed(i);
bIsPeriodic[i] = IsPeriodic(i);
}
for ( i = 0; i < 4; i++ )
bIsSingular[i] = IsSingular(i);
for ( i = 0; i < m_cv_count[0]; i++ )
{
morph.MorphPointList( m_dim, m_is_rat,
m_cv_count[1], m_cv_stride[1],
CV(i,0) );
}
for ( i = 0; i < 4; i++ )
{
if ( bIsSingular[i] )
CollapseSide(i);
}
// TODO - if input was closed/periodic make output the same
return true;
}
bool
ON_Surface::IsAtSingularity(double s, double t,
bool bExact //true by default
) const
{
if (bExact){
if (s == Domain(0)[0]){
if (IsSingular(3))
return true;
}
else if (s == Domain(0)[1]){
if (IsSingular(1))
return true;
}
if (t == Domain(1)[0]){
if (IsSingular(0))
return true;
}
else if (t == Domain(1)[1]){
if (IsSingular(2))
return true;
}
return false;
}
if (IsAtSingularity(s, t, true))
return true;
bool bCheckPartials[2] = {false, false};
int i;
double m[2];
for (i=0; i<2; i++)
m[i] = Domain(i).Mid();
if (s < m[0]){
if (IsSingular(3))
bCheckPartials[1] = true;
}
else {
if (IsSingular(1))
bCheckPartials[1] = true;
}
if (!bCheckPartials[0] && !bCheckPartials[1]){
if (t < m[1]){
if (IsSingular(0))
bCheckPartials[0] = true;
}
else {
if (IsSingular(2))
bCheckPartials[0] = true;
}
}
if (!bCheckPartials[0] && !bCheckPartials[1])
return false;
ON_3dPoint P;
ON_3dVector M[2], S[2];
if (!Ev1Der(s, t, P, S[0], S[1]))
return false;
if (!Ev1Der(m[0], m[1], P, M[0], M[1]))
return false;
for (i=0; i<2; i++){
if (!bCheckPartials[i])
continue;
if (S[i].Length() < 1.0e-6 * M[i].Length())
return true;
}
return false;
}