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Surface display crash

Boris Weisman's picture


I found a very strange surface visualization problem.

Please see attached IGES file. 

Our environment: VC12 32bit. OCC 7.0.0 or 7.2.0

The problem occurred also on ImportExport application  from MFCSamples.

The application  has imported IGES file fine, but  stuck  into display function. I investigated the source code. The problem caused in the StdPrs_CurveDeflection file in  the application enters into drawCurve function. Into  drawCurve  function app. goes into GCPnts_TangentialDeflection Algo(aCurve, theU1, theU2, anAngle, TheDeflection); and stuck there about 100 seconds, and Standard_OutOfMemory esception occured.

Under OCC 6.7.0  this IGES works well and fast.

Please help me to solve the problem or to find workaround.

Thanks in advance

Boris Weisman

Kirill Gavrilov's picture

I have registered bug #29356 for this issue.

Boris Weisman's picture

The workaround was implemented to dismiss the iso-lines out of the range and was found working well for us

Hereunder are the lines added to the StdPrs_Isolines.cxx file in the function addOnSurface line 512 (ver. 7.2.0):

      if (anIsoParam <  theSurface->FirstUParameter() || anIsoParam >  theSurface->LastUParameter())

Will be happy to get your comments

Hope that it can help to somebody else

Kirill Gavrilov's picture

The patch for the issue should be included into next OCCT release.

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