//Bowen Yang.bvr\ncyl=parametricSurface\n\ncyl.setEquation=x,3\n\ncyl.setSegmentCount=70\ncyl.color=green\ncyl.spawn\n\n\nhelix=parametricCurve\nhelix.setMinMax=s,0,pi\nhelix.setMinMax=t,0,2pi\nhelix.setRadius=4\nhelix.setEquation=x,(R*cos(t)*sin(s))\nhelix.setEquation=y,(R*sin(t)*sin(s))\nhelix.setEquation=z,(R*cos(s))\nhelix.setSegmentCount=20\nhelix.color=blue\nhelix.spawn/\n