Fri, 08/02/2002 - 19:49
Forums:
Hi Everyone,
I noticed that there is no method in OpenCascade for calculating 3D curve/curve intersections, but that everyone seems to recommend using the GeomAPI_ExtremaCurveCurve class. The documentation for this class, however, seems to suggest that it may not return all intersection points (unless the two curves are tangential at the intersection). In fact, I did several tests of BSpline curve/curve intersection and noticed that all intersections were not necessarily returned by this algorithm. Can anyone else comment on this matter? Has anyone found a better method to calculate intersections, or should this class, in fact, do it?
Tom.
Wed, 03/14/2012 - 20:43
The topic of 3d curve intersection has been often touched, but the limitations of GeomAPI_ExtremaCurveCurve are still not clear.
Could someone explain the following documentation sentences?
"
Warning
In some cases, the nearest points between two
curves do not correspond to one of the computed
extrema. Instead, they may be given by:
a limit point of one curve and one of the following:
its orthogonal projection on the other curve,
a limit point of the other curve; or
an intersection point between the two curves.
"
Does one have to call other methods after calling GeomAPI_ExtremaCurveCurve, to find these points too?
I am tempted into calling IntTools_EdgeEdge instead (after creating two edges from the curves).
Has anyone tried out of the boolean operation algorithm?
Thank everybody.