practice.bvr\n// Parametric curve\nhelix=parametricCurve\nhelix.setMinMax=t,-10,10\nhelix.setEquation=x,(cos(t))\nhelix.setEquation=y,(sin(t))\nhelix.setEquation=z,(.3*t)\nhelix.setSegmentCount=70\nhelix.setThickness=0.2\nhelix.color=red\nhelix.spawn\n \n// Parametric surface\ncyl=parametricSurface\ncyl.setMinMax=s,-10,10\ncyl.setMinMax=t,0,6.6\ncyl.setEquation=x,(cos(t))\ncyl.setEquation=y,(sin(t))\ncyl.setEquation=z,(.3*s)\ncyl.setSegmentCount=20\ncyl.color=blue\ncyl.spawn