Give a point on BSplineSurface or BSplineCurve, How to compute its U or V parameters?
Give a point on BSplineSurface or BSplineCurve, How to compute its U or V parameters?
SunHongLei
2013/03/12 15:00
Give a point on BSplineSurface or BSplineCurve, How to compute its U or V parameters?
For example,given a point P on a BSplineCurve f, how can i get its U value in opencascade？
Rob Bachrach
2013/03/12 15:09
Check out GeomAPI_ProjectPointOnCurve and GeomAPI_ProjectPointOnSurf. These will project your point onto the curve or surface. The LowerDistanceParameter and LowerDistanceParameters functions can retrieve your UV values.
Timo
2013/03/12 15:27
You can also use the BRepExtrema_DistShapeShape class, which can calculate the minimum distance between two shapes, e.g. a vertex and a face. It provides methods "ParOn..." to get the corresponding u/v-parameters.
*************** to run this on a curve follow the same procedure but use the ShapeAnalysis_Curve.cxx class instead of the ShapeAnalysis_Surface class.
note: might have to make sure the point is literally on the surface, by projecting it to the surface first./ don't remember off the bat if its necessary to do this.
