How to set viewing a canvas with `X3D` from program

[p73]

I want to see my canvas in X3D after execution of my program. I could do this by hand:
View->View With->X3D.
But how to do this from program by code?
I read a docs (not very deep) and I saw that gPad->x3d() deprecated so I used

myCanvas->GetViewer3D()

but nothing has been changed.

[couet]

myCanvas->Update();
myCanvas->GetViewer3D("x3d");

[p73]

After `c->GetViewer3D(“x3d”) I get Segmentation violation with the following error:

Error in TViewerX3D::InitX3DWindow: view is not set

Note: x3d view works perfectly if I set it by hand.

[couet]

can you try this macro:. It works for me.

{
   c1 = new TCanvas("c1","Geometry Shapes",200,10,700,500);

   //delete previous geometry objects in case this script is reexecuted
   if (gGeometry) {
      gGeometry->GetListOfNodes()->Delete();
      gGeometry->GetListOfShapes()->Delete();
   }

   //  Define some volumes
   brik = new TBRIK("BRIK","BRIK","void",200,150,150);
   sphe1 = new TSPHE("SPHE1","SPHE1","void",0,140, 0,180, 0,360);
   sphe2 = new TSPHE("SPHE2","SPHE2","void",0,140, 0,180, 0,360);

   //  Set shapes attributes
   brik->SetLineColor(kBlue);
   sphe1->SetLineColor(kRed);
   sphe2->SetLineColor(kYellow);

   //  Build the geometry hierarchy
   node1 = new TNode("NODE1","NODE1","BRIK");
   node1->cd();

   node2  = new TNode("NODE2","NODE2","SPHE1",-200,-150,-140);
   node3  = new TNode("NODE3","NODE3","SPHE2",-400,-400,-400);

   // Draw this geometry in the current canvas
   node1->cd();
   node1->Draw();
   c1->Update();

   c1->GetViewer3D("x3d");
}

[p73]

I did not try. But after adding

c->Update();

next to GetViewer3D("x3d") it worked. Thank you. Why is this so?

[couet]

@p73

Why is this so?

The scene need to be fully rendered before being displayed with x3d.