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0031381: Foundation Classes -wrong evaluations for rational BSpline curves using Adaptor curves

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BSplCLib_Cache.cxx - it is forbidden zeroing derivatives for rational splines when derivative order more than degree

bug31381 - test case added
This commit is contained in:
ifv 2020-02-20 14:42:47 +03:00 committed by bugmaster
parent ae87bb87d0
commit f732ea1ab5
2 changed files with 16 additions and 1 deletions
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2
src/BSplCLib/BSplCLib_Cache.cxx
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@ -111,7 +111,7 @@ void BSplCLib_Cache::CalculateDerivative(const Standard_Real& theParameter,
// When the degree of curve is lesser than the requested derivative,
// nullify array cells corresponding to greater derivatives
Standard_Integer aDerivative = theDerivative;
if (myParams.Degree < theDerivative)
if (!myIsRational && myParams.Degree < theDerivative)
{
aDerivative = myParams.Degree;
for (Standard_Integer ind = myParams.Degree * aDimension; ind < (theDerivative + 1) * aDimension; ind++)

15
tests/bugs/fclasses/bug31381 Normal file
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@ -0,0 +1,15 @@
puts "# ============"
puts "# 0031381: Foundation Classes - wrong evaluations for rational BSpline curves using Adaptor curves "
puts "# ============"
puts ""
puts "Eliminate output of approxcurve command"
puts "REQUIRED ALL: Error 4.32754e-05"
circle c 0 0 1
puts "Get rational BSpline curve of degree 2"
convert c c
puts "Get offset curve to force calculation of D3 for base curve when algorithm needs D2 for offset"
offset oc c -.5
puts "Approximate offset curve with continuity C2"
approxcurve ac oc 1.e-4 2 5 25
checklength ac -l 3.1415850499856011