【转帖】performance oddbsplinegetarea90 exceptionally slow
 

performance: oddbspline::getarea() exceptionally slow
performance: oddbspline::getarea() exceptionally slow
hi,
we're using dd libs 2.1.0 built with vc8 and xcode. we were investigating some performance issues in our export to autocad formats and found that the call to oddbspline::getarea() is taking an exceptionally long amount of time, considerably slowing down any drawing that has any reasonably number of splines to be exported.
the relevant code we're using is:
code:
oddbsplineptr pspline = oddbspline::createobject();
...
pspline->setnurbsdata(3, // degree
false, // rational
m_isclosed, // closed
false, // periodic
m_property->m_controlpoints, // control points
m_property->m_knots, // knots
weights, // weights
1.0000e-10, // control point tolerance
1.0000e-10); // knot tolerance
...
double area = 0;
odresult result = pspline->getarea(area)fff">;
...
has anyone else seen this?
regards,
varun
control point tolerance is too "fine".
getarea() uses getsamplepoints() with that tolerance.
vladimir