For some STEP files we fail for geometric tolerances to read the "geometric_tolerance.magnitude"

[T-Dunker]

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Description

For some STEP files we fail for geometric tolerances to read the "geometric_tolerance.magnitude" as a StepBasic_MeasureWithUnit. The parameter 3 may be of type StepRepr_ReprItemAndLengthMeasureWithUnitAndQRI or StepRepr_ReprItemAndPlaneAngleMeasureWithUnitAndQRI.

There is a method

Handle<StepBasic_MeasureWithUnit> GetMeasureWithUnit () const 

inherited from StepRepr_ReprItemAndMeasureWithUnit (parent of the parent), which would return the needed handle, but none of the parent Types satisfies isKind("StepBasic_MeasureWithUnit")

There are multiple tolerances concerned in src\RWStepDimTol:

• RWStepDimTol_RWAngularityTolerance.cxx
• RWStepDimTol_RWCircularRunoutTolerance.cxx
• RWStepDimTol_RWCoaxialityTolerance.cxx
• RWStepDimTol_RWConcentricityTolerance.cxx
• RWStepDimTol_RWCylindricityTolerance.cxx
• RWStepDimTol_RWFlatnessTolerance.cxx
• RWStepDimTol_RWGeometricToleranceWithDatumReference.cxx
• RWStepDimTol_RWGeometricToleranceWithDefinedAreaUnit.cxx
• RWStepDimTol_RWGeometricToleranceWithDefinedUnit.cxx
• RWStepDimTol_RWGeometricToleranceWithMaximumTolerance.cxx
• RWStepDimTol_RWGeometricToleranceWithModifiers.cxx
• RWStepDimTol_RWLineProfileTolerance.cxx
• RWStepDimTol_RWModifiedGeometricTolerance.cxx
• RWStepDimTol_RWParallelismTolerance.cxx
• RWStepDimTol_RWPerpendicularityTolerance.cxx
• RWStepDimTol_RWPositionTolerance.cxx
• RWStepDimTol_RWRoundnessTolerance.cxx
• RWStepDimTol_RWStraightnessTolerance.cxx
• RWStepDimTol_RWSurfaceProfileTolerance.cxx
• RWStepDimTol_RWSymmetryTolerance.cxx
• RWStepDimTol_RWTotalRunoutTolerance.cxx
• RWStepDimTol_RWUnequallyDisposedGeometricTolerance.cxx

Among the NIST PMI step file examples there are some, where the 3rd parameter of the geometric tolerances is of the form

#id=(
LENGTH_MEASURE_WITH_UNIT()
MEASURE_REPRESENTATION_ITEM()
MEASURE_WITH_UNIT(LENGTH_MEASURE(value),#id)
REPRESENTATION_ITEM('')
);

where the reading fails:

• nist_ctc_01_asme1_ap242-e1.stp
• nist_ctc_02_asme1_ap242-e2.stp
• nist_ctc_03_asme1_ap242-e2.stp
• nist_ftc_08_asme1_ap242-e2.stp
• nist_stc_10_asme1_ap242-e2.stp

For others the 3rd parameter is of the expected form

#id=LENGTH_MEASURE_WITH_UNIT(LENGTH_MEASURE(value),#id);

and the reading of the magnitude succeds:

• nist_ctc_05_asme1_ap242-e1.stp
• nist_ftc_06_asme1_ap242-e2.stp
• nist_ftc_07_asme1_ap242-e2.stp
• nist_ftc_09_asme1_ap242-e1.stp
• nist_ftc_10_asme1_ap242-e2.stp
• nist_stc_06_asme1_ap242-e3.stp
• nist_stc_08_asme1_ap242-e3.stp
• nist_stc_09_asme1_ap242-e3.stp

Expected Behavior

Tolerance values correspond to the file content in some cases. In others the tolerance values are zero.

Actual Behavior

Tolerance values should correspond to the file content.

Sample Code or DRAW Tcl Script

    Handle(XCAFDoc_DimTolTool) gdtTool = XCAFDoc_DocumentTool::DimTolTool(doc->Main());
    TDF_LabelSequence labels;
    gdtTool->GetGeomToleranceLabels(labels);
    for (Standard_Integer idx = labels.Lower(); idx <= labels.Upper(); ++idx)
    {
      TDF_Label label = labels.Value(idx);
      Handle(XCAFDoc_GeomTolerance) tol;
      if (label.FindAttribute(XCAFDoc_GeomTolerance::GetID(), tol)) 
      {
        Handle(XCAFDimTolObjects_GeomToleranceObject) tolObj = tol->GetObject();
        std:::cout << "[Value]: " << tolObj->GetValue() << std::endl;
      }
    }

Operating System

Linux

Compiler

GCC

Bitness

64-bit

OCCT Version

latest

Additional Files

for failure: nist_ctc_01_asme1_ap242-e1.stp for success: nist_ctc_05_asme1_ap242-e1.stp

nist_ctc_05_asme1_ap242-e1.zip