3D case: SetPolyMarker() vs SetPoint()

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Hi Rooters,

It seems that something is missing in SetPolyMarker() method. At least the 
following macro do not draw the points. If one change the marked line to 

  a->SetPoint( 0, 1, 1, 1 );
  a->SetPoint( 1, 2, 3, 4 );

everythig is ok.

Regards
Valeri

pm.C
-----------------------------------------
{
  gROOT->Reset();

    sky = new TCanvas( "sky", "Test", 300, 10, 700, 500 );
    sky->SetFillColor(38);

    Float_t p[2][3]={ {1,1,1}, {2,3,4} };

   TView *v1 = new TView(1);
   v1->SetRange(0,0,0,5,5,5);

  TPolyMarker3D *a = new TPolyMarker3D();
  a->SetPolyMarker(2,p,20);                    // the marked line
  a->SetMarkerColor(4);
  a->SetMarkerSize(5);
  a->SetMarkerStyle(20);

  a->Draw();
  sky->Update();

  Float_t *pp=0;
  pp = a->GetP();
  printf("%f %f %f  %f %f %f \n", pp[0], pp[1], pp[2], pp[3],pp[4],pp[5]);
} 

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