Wed, 01/26/2011 - 19:19
Forums:
Hello,
I have an AIS_SHAPE the I can display in Shaded Mode or Wireframe Mode (method SetDisplayMode()), but how can I display a solid object in shaded mode with his wireframe ?
The problem is that some objects are not rendered in a clear mode without their wireframe.
Thanks,
Wed, 01/26/2011 - 19:30
Do you want to render the edges as wires on top of the shaded surface of the solid?
In that case you could simply add the wires as additional AIS_Shape objects to the context
Wed, 01/26/2011 - 19:37
Hello,
the AIS_Shape doesn't support the mix of wireframe and shading. What we did here was to add that support to the AIS_Shape itself when the shape is displayed with no transparency. Like you, we needed that to help visualize the shape.
Here is a sample of the Compute method of AIS_Shape for release 6.4.0. I'll let you check what is different with you current file...
Good Luck,
Francois.
//=======================================================================
//function : Compute
//purpose :
//=======================================================================
void AIS_Shape::Compute(const Handle(PrsMgr_PresentationManager3d)& /*aPresentationManager*/,
const Handle(Prs3d_Presentation)& aPrs,
const Standard_Integer aMode)
{
aPrs->Clear();
if(myshape.IsNull()) return;
// wire,edge,vertex -> pas de HLR + priorite display superieure
Standard_Integer TheType = (Standard_Integer) myshape.ShapeType();
if(TheType>4 && TheType<8) {
aPrs->SetVisual(Graphic3d_TOS_ALL);
aPrs->SetDisplayPriority(TheType+2);
}
// Shape vide -> Assemblage vide.
if (myshape.ShapeType() == TopAbs_COMPOUND) {
#ifdef BUC60547
TopoDS_Iterator anExplor (myshape);
#else
TopExp_Explorer anExplor (myshape, TopAbs_VERTEX);
#endif
if (!anExplor.More()) {
return;
}
}
if (IsInfinite()) aPrs->SetInfiniteState(Standard_True); //pas de prise en compte lors du FITALL
switch (aMode) {
case 0:{
try {
// set temp color and with
Handle_Prs3d_LineAspect wireAspect=myDrawer->FreeBoundaryAspect();
Quantity_Color color;
Color(color);
wireAspect->SetColor(color);
wireAspect->SetWidth(1.);
myDrawer->SetFreeBoundaryAspect(wireAspect);
wireAspect=myDrawer->UnFreeBoundaryAspect();
wireAspect->SetColor(Quantity_NOC_YELLOW);
wireAspect->SetWidth(1.);
myDrawer->SetUnFreeBoundaryAspect(wireAspect);
StdPrs_WFDeflectionShape::Add(aPrs,myshape,myDrawer);
}
catch (Standard_Failure) {
#ifdef DEB
std::cout << "AIS_Shape::Compute() failed"<< std::endl;
#endif
std::cout << "a Shape should be incorrect : No Compute can be maked on it "<< std::endl;
// on calcule une presentation de la boite englobante
// Compute(aPresentationManager,aPrs,2);
}
break;
}
case 1:
{
Standard_Real prevangle ;
Standard_Real newangle ;
Standard_Real prevcoeff ;
Standard_Real newcoeff ;
Standard_Boolean ownDevAngle=OwnDeviationAngle(newangle,prevangle);
Standard_Boolean ownDevCoeff=OwnDeviationCoefficient(newcoeff,prevcoeff);
if (ownDevAngle || ownDevCoeff)
if (Abs (newangle - prevangle) > Precision::Angular() ||
Abs (newcoeff - prevcoeff) > Precision::Confusion() ) {
#ifdef DEB
std::cout << "AIS_Shape : compute"<4)
StdPrs_WFDeflectionShape::Add(aPrs,myshape,myDrawer);
else {
myDrawer->SetShadingAspectGlobal(Standard_False);
if (IsInfinite()) StdPrs_WFDeflectionShape::Add(aPrs,myshape,myDrawer);
else {
{
try {
OCC_CATCH_SIGNALS
StdPrs_ShadedShape::Add(aPrs,myshape,myDrawer);
}
catch (Standard_Failure) {
#ifdef DEB
std::cout << "AIS_Shape::Compute() in ShadingMode failed"<< std::endl;
#endif
StdPrs_WFShape::Add(aPrs,myshape,myDrawer);
}
}
}
}
#ifdef BUC60918
Standard_Real value = Transparency() ;
if( value > 0. ) {
SetTransparency( value );
}
#endif
// set temp color and with
if( Abs(value) FreeBoundaryAspect();
wireAspect->SetColor(Quantity_NOC_BLACK);
wireAspect->SetWidth(0.5);
myDrawer->SetFreeBoundaryAspect(wireAspect);
wireAspect=myDrawer->UnFreeBoundaryAspect();
wireAspect->SetColor(Quantity_NOC_BLACK);
wireAspect->SetWidth(0.5);
myDrawer->SetUnFreeBoundaryAspect(wireAspect);
DrawEdges(aPrs,myshape,myDrawer);
}
break;
}
case 2:
{
// boite englobante
if (IsInfinite()) StdPrs_WFDeflectionShape::Add(aPrs,myshape,myDrawer);
else DisplayBox(aPrs,BoundingBox(),myDrawer);
}
} // end switch
aPrs->ReCompute(); // for hidden line recomputation if necessary...
}
Wed, 01/26/2011 - 19:41
I forgot, you will need DrawEdge and DrawPolygon if you're planning on using that.
static Standard_Boolean AddPolygon(const TopoDS_Edge& E,
Handle(Graphic3d_Group)& TheGroup,
const Standard_Real deflection,
const Handle (Prs3d_Drawer)& aDrawer)
{
TopLoc_Location l;
gp_Pnt P;
Standard_Boolean result = Standard_False;
Standard_Boolean OK;
Standard_Real fi, la;
Handle(Poly_Polygon3D) Polyg;
Handle(Geom_Curve) CC3d = BRep_Tool::Curve(E, fi, la);
Polyg = BRep_Tool::Polygon3D(E, l);
if (!Polyg.IsNull()) {
OK = Polyg->Deflection() <= deflection;
OK = OK || (CC3d.IsNull());
if (Polyg->Deflection() <= deflection) {
result = Standard_True;
const TColgp_Array1OfPnt& Points = Polyg->Nodes();
Graphic3d_Array1OfVertex V(1, Points.Length());
Standard_Integer po, ii = 1;
if (l.IsIdentity()) {
for (po = Points.Lower(); po <= Points.Upper(); po++) {
P = Points.Value(po);
V(ii).SetCoord(P.X(), P.Y(), P.Z());
ii++;
}
}
else {
for (po = Points.Lower(); po <= Points.Upper(); po++) {
P = Points.Value(po).Transformed(l);
V(ii).SetCoord(P.X(), P.Y(), P.Z());
ii++;
}
}
TheGroup->Polyline(V);
return result;
}
}
Handle(Poly_Triangulation) Tr;
Handle(Poly_PolygonOnTriangulation) HIndices;
BRep_Tool::PolygonOnTriangulation(E, HIndices, Tr, l);
if (!HIndices.IsNull()) {
OK = HIndices->Deflection() <= deflection;
OK = OK || (CC3d.IsNull());
if (OK) {
result = Standard_True;
const TColStd_Array1OfInteger& Indices = HIndices->Nodes();
const TColgp_Array1OfPnt& Nodes = Tr->Nodes();
Graphic3d_Array1OfVertex V(1, Indices.Length());
Standard_Integer po, ii = 1;
if (l.IsIdentity()) {
for (po = Indices.Lower(); po <= Indices.Upper(); po++) {
P = Nodes(Indices(po));
V(ii).SetCoord(P.X(), P.Y(), P.Z());
ii++;
}
}
else {
for (po = Indices.Lower(); po <= Indices.Upper(); po++) {
P = Nodes(Indices(po)).Transformed(l);
V(ii).SetCoord(P.X(), P.Y(), P.Z());
ii++;
}
}
TheGroup->Polyline(V);
return result;
}
}
return result;
}
void
DrawEdges(const Handle(Prs3d_Presentation)& aPrs,
const TopoDS_Shape& aShape,
const Handle (Prs3d_Drawer)& aDrawer)
{
if (aShape.IsNull()) return;
Prs3d_ShapeTool Tool(aShape);
TopTools_ListOfShape LFree, LUnFree, LWire;
for(Tool.InitCurve();Tool.MoreCurve();Tool.NextCurve()){
Standard_Integer neigh = Tool.Neighbours();
const TopoDS_Edge& E = Tool.GetCurve();
if (neigh >= 2) {
LUnFree.Append(E);
}
else if (neigh == 1) {
LFree.Append(E);
}
else if (neigh == 0) {
LWire.Append(E);
}
}
TopTools_ListIteratorOfListOfShape It;
Handle(Graphic3d_Group) TheGroup = Prs3d_Root::NewGroup(aPrs);
Standard_Real aDeflection;
Aspect_TypeOfDeflection TOD = aDrawer->TypeOfDeflection();
if (TOD == Aspect_TOD_RELATIVE) {
// On calcule la fleche en fonction des min max globaux de la piece:
Standard_Real aXmin, aYmin, aZmin, aXmax, aYmax, aZmax;
aDeflection = aDrawer->MaximalChordialDeviation();
Bnd_Box Total;
BRepBndLib::Add(aShape, Total);
Total.Get(aXmin, aYmin, aZmin, aXmax, aYmax, aZmax);
aDeflection = MAX3( aXmax-aXmin , aYmax-aYmin , aZmax-aZmin)
* aDrawer->DeviationCoefficient();
}
else {
aDeflection = aDrawer->MaximalChordialDeviation();
}
if (aDrawer->WireDraw()) {
// Wire (without any neighbour)
TheGroup->SetPrimitivesAspect(aDrawer->WireAspect()->Aspect());
TheGroup->BeginPrimitives();
for (It.Initialize(LWire); It.More(); It.Next()) {
const TopoDS_Edge& E = TopoDS::Edge(It.Value());
try {
if (!AddPolygon(E, TheGroup, aDeflection, aDrawer)) {
if (BRep_Tool::IsGeometric(E)) {
BRepAdaptor_Curve C(E);
TColgp_SequenceOfPnt Points;
StdPrs_DeflectionCurve::Add(aPrs, C, aDeflection, aDrawer,Points);
}
}
}
catch(Standard_Failure) {
}
}
TheGroup->EndPrimitives();
}
if (aDrawer->FreeBoundaryDraw()) {
// Free boundaries;
TheGroup->SetPrimitivesAspect(aDrawer->FreeBoundaryAspect()->Aspect());
TheGroup->BeginPrimitives();
for (It.Initialize(LFree); It.More(); It.Next()) {
const TopoDS_Edge& E = TopoDS::Edge(It.Value());
if (!BRep_Tool::Degenerated(E)) {
try {
if (!AddPolygon(E, TheGroup, aDeflection, aDrawer)) {
if (BRep_Tool::IsGeometric(E)) {
BRepAdaptor_Curve C(E);
TColgp_SequenceOfPnt Points;
StdPrs_DeflectionCurve::Add(aPrs, C, aDeflection, aDrawer,Points);
}
}
}
catch(Standard_Failure) {
}
}
}
TheGroup->EndPrimitives();
}
if (aDrawer->UnFreeBoundaryDraw()) {
// Unfree boundaries;
TheGroup->SetPrimitivesAspect(aDrawer->UnFreeBoundaryAspect()->Aspect());
TheGroup->BeginPrimitives();
for (It.Initialize(LUnFree); It.More(); It.Next()) {
const TopoDS_Edge& E = TopoDS::Edge(It.Value());
try {
if (!AddPolygon(E, TheGroup, aDeflection, aDrawer)) {
if (BRep_Tool::IsGeometric(E)) {
BRepAdaptor_Curve C(E);
TColgp_SequenceOfPnt Points;
StdPrs_DeflectionCurve::Add(aPrs, C, aDeflection, aDrawer,Points);
}
}
}
catch(Standard_Failure) {
}
}
TheGroup->EndPrimitives();
}
}
Sun, 04/14/2013 - 08:42
hello,François Lauzon,I want to display a model in wireframe way which appears like opencascade and I want to get the discrete data so i can display with opengl. So I want to ask do you know how opencascade dicrete a model?
Wed, 01/26/2011 - 19:52
Thanks François for sharing the code. I was looking for this too.
Venu
Wed, 01/26/2011 - 20:02
Thanks for your prompt answer,
I will try the 2 solutions in the next days,
Thanks to everybody
Wed, 01/26/2011 - 21:24
Hello,
I believe that the initial design of OCC visualization had in mind such a case where the edges should be displayed at the same time with the shading.One could track down to the first releases that the Prs3d_ShadingAspect class of visualization provides a call to set the edges on.Without investigating deeper i think that the usage of Prs3d_ShadingAspect::SetEdgeOn() of this class uses the underlying OpenGL::glEdgeFlag for the drawn primitives (a better way to provide such feature than re-drawing the edges in my opinion).Unfortunatelly while this feature works for simple shapes it seems that there is a bug which registers non-edge primitives as edge ones and with complex shapes it does not work as intended.Maybe if time allows i will dig a bit deeper and try to find the root of the problem.If anyone knows something more on this issue i would be glad to hear about.
Fotis