Hello,
I have a novice question regarding this geometry with 2 boxes:
[code]ex()
{
gSystem->Load(“libGeom”);
TGeoManager *geom = new TGeoManager(“geom”, “test”);
TGeoMaterial *vacuum = new TGeoMaterial(“Vacuum”, 0, 0, 0);
TGeoMedium *mVac = new TGeoMedium(“GVAC”, 0, vacuum);
TGeoVolume *top = gGeoManager->MakeBox(“Top”, mVac, 1000., 1000., 1000.);
gGeoManager->SetTopVolume(top);
gGeoManager->SetTopVisible(0);
box1 = gGeoManager->MakeBox(“box1”, mVac, 100., 100., 100.);
box1->SetLineColor(kGray);
box1->SetTransparency(70);
box2 = gGeoManager->MakeBox(“box2”, mVac, 50., 50., 50.);
box2->SetLineColor(kRed);
// both boxes are shown
top->AddNode(box1, 1);
top->AddNodeOverlap(box2, 1);
// Why only box2 is visible?
// box1->AddNode(box2, 1);
// top->AddNode(box1, 1);
top->Draw(“ogl”);
}[/code]
If I put the boxes directly into the top volume
top->AddNode(box1, 1);
top->AddNodeOverlap(box2, 1);
Then both boxes are shown (see top.png attached).
However, if I put box2 into box1, and box1 into top:
box1->AddNode(box2, 1);
top->AddNode(box1, 1);
then only box2 is shown (see box2.png attached)
How do I visualise the mother volume (box1) in the latter case? What am I doing wrong?
ex.C (663 Bytes)