\n//dragon.bvr\n\n//Parametric surface\nt=parametricSurface\nt.setMinMax=s,0,6.5\nt.setMinMax=t,0,6.5\nt.setEquation=x,((2+1*cos(s))*cos(t))\nt.setEquation=y,((2+1*cos(s))*sin(t))\nt.setEquation=z,(sin(s))\nt.setSegmentCount=30\nt.color=green\nt.spawn\n\n//Horizontal circle\nhc = parametricCurve\nhc.setMinMax=t,0,6.5\nhc.setEquation=x,(3*cos(t))\nhc.setEquation=y,(3*sin(t))\nhc.setEquation=z,0\nhc.setSegmentCount=30\nhc.setThickness=.2\nhc.color=red\nhc.spawn\n\n//Vertical circle\nvc = parametricCurve\nvc.setMinMax=t,0,6.5\nvc.setEquation=x,0\nvc.setEquation=y,(2+sin(t))\nvc.setEquation=z,(0+cos(t))\nvc.setSegmentCount=30\nvc.setThickness=.2\nvc.color=blue\nvc.spawn