Mon, 10/02/2000 - 16:56
I've got a problem...
I tried to import a company-internal file format into OC. This kind of files describe 3-dimensional clouds Everything works fine, but after processing the file I have to display some thousands of points(vertices). How can I do this in a fast way? I tried it by doing something like this:
for(i = 0; i
{
Geom_CartesianPoint P(x[i], y[i], z[i]);
myAISContext->Display(new AIS_Point(&P));
}
or:
for(i = 0; i
{
gp_Pnt P(x[i], y[i], z[i]);
TopoDS_Vertex V = BRepBuilderAPI_MakeVertex(P);
aSequence->Append(V);
}
if(!aSequence.IsNull())
{
for(Standard_Integer i = 1; i Length(); i++)
myAISContext->Display(new AIS_Shape(aSequence->Value(i)));
}
But those need eons to complete. Does anybody know how I can do this faster??
And how can I force OC to display just Points(Pixels) instead of those "crosses" for an Vertex?
Thank you for any help...
Mon, 10/02/2000 - 17:20
Hello,
you need to write your owndisplay object.
Create a new class inheriting from AIS_InteractiveObject.
I think you can see the samples with the file User_Cylinder.cxx to see how to do that.
In the Compute Method , you can get a Graphic3d_Group doing the following :
Handle(Graphic3d_Structure) theStructure = Handle(Graphic3d_Structure)::DownCast(aPresentation);
Handle(Graphic3d_Group) theGroup= new Graphic3d_Group(theStructure);
You must set the marker type in the Drawer to Aspect_TOM_Point
Handle(Graphic3d_AspectMarker3d) asp = myDrawer->PointAspect();
asp->SetTypeOfMarker(Aspect_TOM_POINT)
And in this Group , there is a method : MarkerSet where you can give a list of points
MyObject::Compute(...) {
Handle(Graphic3d_Structure) theStructure = Handle(Graphic3d_Structure)::DownCast(aPresentation);
Handle(Graphic3d_Group) theGroup= new Graphic3d_Group(theStructure);
Handle(Graphic3d_AspectMarker3d) asp; asp = myDrawer->PointAspect()->Aspect();
asp->SetTypeOfMarker(Aspect_TOM_POINT);
theGroup->SetGroupPrimitivesAspect(asp);
const Graphic3d_Array1OfVertex& theArray = GetVertices(); //your points
theGroup->MarkerSet(theArray);
}
Tue, 10/03/2000 - 02:44
If you use the display method this way the viewer is updated after every single point
this should speed up your application for(Standard_Integer i = 1; i <= aSequence->Length(); i++) { myAISContext->Display(new AIS_Shape(aSequence->Value(i)),false); } myAISContext->UpdateCurrentViewer();