AIS_Shape DisplayMode

Hello.

AIS interface of OCCT is flexible and offers you full control on any attributes.

There are 2 possible solution, write you own drawing or override attributes of already existed shapes. I will share some small samples, but correct samples require the infromation about your implementation.

Additionally, OCCT offers technical support (guiding you with OCCT usage), custom development (helping to create or modify your application or only some parts), trainings (online or on-side trainings with OCCT experts) and e-learnings.

The sample (it is just peaces of different classes, but just samples with overriding material of solids or edges):

void ImageDump::displayCutCurves(const BSONReader::CuttingCurves& aCuttingCurvesData,
                                                 Handle(AIS_InteractiveContext)                   theContext) const
{
  for (const auto& aCurveData : aCuttingCurvesData)
  {
    for (const auto& aTransformation : aCurveData.second)
    {
      Handle(AIS_Shape) aShapePrs = new AIS_Shape(aCurveData.first);
      aShapePrs->SetLocalTransformation(aTransformation);
      const Quantity_Color aCuttingLineColor = myVisParams.UseSpecifiedColor
                                             ? myVisParams.ColorCuttingLine
                                             : Quantity_NOC_BLUE;
      aShapePrs->SetColor(aCuttingLineColor);
      aShapePrs->Attributes()->SetLineAspect(new Prs3d_LineAspect(aCuttingLineColor, Aspect_TOL_SOLID, 5.0));
      theContext->Display(aShapePrs, AIS_Shaded, -1, Standard_False);
    }
  }
}


  Handle(XCAFDoc_ShapeTool) aShapeTool = XCAFDoc_DocumentTool::ShapeTool(myDoc->Main());
  TDF_LabelSequence aRootLabels;
  aShapeTool->GetFreeShapes(aRootLabels);
  for (TDF_LabelSequence::Iterator anIt(aRootLabels); anIt.More(); anIt.Next())
  {
    Handle(XCAFPrs_AISObject) aShapePrs = new XCAFPrs_AISObject(anIt.Value());
    if (myVisParams.HasFaceBoundaries)
    {
      aShapePrs->Attributes()->SetFaceBoundaryAspect(new Prs3d_LineAspect(myVisParams.BoundariesColor, Aspect_TOL_SOLID, 1.0));
    }
    aContext->Display(aShapePrs, AIS_Shaded, -1, Standard_False);
  }

void ImageDump::displaySolids(const BSONShapesData& theShapesData,
                                              Handle(AIS_InteractiveContext)        theContext)
{
  for (const auto& aShapeData : theShapesData.GetShapesData())
  {
    const TopoDS_Shape&                                 aCurrentShape   = aShapeData.first;
    const BSONShapesData::ShapeIndices& aCurrentIndices = aShapeData.second;

    const std::vector<gp_Trsf>* aTransformations = theShapesData.GetTransformations(aCurrentIndices);
    if (!aTransformations)
    {
      continue;
    }
  
    for (const auto& aTransformation : *aTransformations)
    {
      Handle(AIS_ColoredShape) aShapePrsTransformed = new AIS_ColoredShape(aCurrentShape);
      // Set color.
      if (const Quantity_Color* aColor = theShapesData.GetColor(aCurrentIndices))
      {
        aShapePrsTransformed->SetColor(*aColor);
      }
      // Set transformation.
      aShapePrsTransformed->SetLocalTransformation(aTransformation);
      // Set face boundary aspect.
      if (myVisParams.HasFaceBoundaries)
      {
        aShapePrsTransformed->Attributes()->SetFaceBoundaryAspect(new Prs3d_LineAspect(myVisParams.BoundariesColor,
                                                                                       Aspect_TOL_SOLID,
                                                                                       1.));
      }
      // Add to context.
      theContext->Display(aShapePrsTransformed, AIS_Shaded, -1, Standard_False);
    }
  }
}

Best regards, Commenter-1

Oh, great i see the idea!

Thanks for the tip, we most probably will be using tech support and elearnings soon, for now, its just a POC we are creating to see the viability of the project.

I was tinkering with the DefaultDrawer in the CSharp_D3D sample (wpf) OCCTProxyD3D.cpp OCCTProxyD3D::InitViewer() and added this:

    myAISContext()->DefaultDrawer()->SetFaceBoundaryDraw(Standard_True);
    myAISContext()->DefaultDrawer()->SetFaceBoundaryAspect(new Prs3d_LineAspect(Quantity_NOC_BLACK, Aspect_TOL_SOLID, 1.0));

And it worked like a charm!

Funnily i was so close to find the solution, but i was using the free and unfree boundaries instead, which did not have any effect (what are they?).

Will keep trying to figure out how to show the different face colors of step imported shapes (instead of forcing a single color for all) and tweaking the selection and hilight as per our needs.

Thanks so much for your help!
Best regards,
Author

Author wrote:

Funnily i was so close to find the solution, but i was using the free and unfree boundaries instead, which did not have any effect (what are they?).

Prs3d_Drawer::FreeBoundaryAspect()/UnFreeBoundaryAspect()/WireAspect() aspects affect displaying edges in AIS_Wireframe mode (as well as UIsoAspect/VIsoAspect() for isolines). E.g. UnFree for internal boundaries (shared between faces), Free for external boundaries, Wire for edges that are not part of any boundary.

Great thanks for the info!

I guess then that LineAspect is for any curves/inear topology, isn't it?