Is necessary to clean the triangles before recomputation?

Hi gays,

I'm trying to upgrade OCCT to version 6.5.4 for my software, but I found that all CAD operations take 10x longer time than version 6.5.1.

Compares the changes between version 6.5.1 and version 6.5.4, I found that triangles of the shape will be clean before the re-computation of shape triangulation.

Industry geometries are usually not fine for triangulation, I think that user is unable to wait for such a long time.

Following lines please found the changes:

- OCCT 6.5.1: Prs3d_ShadedShape::Add

Standard_Real aDeflection = GetDeflection(aShape, aDrawer);
//using of plugin
BRepMesh_PDiscretRoot pAlgo;
pAlgo=BRepMesh_DiscretFactory::Get().Discret(aShape,
aDeflection,
aDrawer->HLRAngle());
if (pAlgo)
pAlgo->Perform();

- OCCT 6.5.4:

Standard_Real aDeflection = GetDeflection (theShape, theDrawer);

// Check if it is possible to avoid unnecessary recomputation
// of shape triangulation
if (!BRepTools::Triangulation (theShape, aDeflection))
{
BRepTools::Clean (theShape);

// retrieve meshing tool from Factory
Handle(BRepMesh_DiscretRoot) aMeshAlgo = BRepMesh_DiscretFactory::Get().Discret (theShape,
aDeflection,
theDrawer->HLRAngle());
if (!aMeshAlgo.IsNull())
aMeshAlgo->Perform();
}