// donnat.bvr\n \n \n// Parametric surface\ncy=parametricSurface\ncy.setMinMax=s,0,6.3\ncy.setMinMax=t,0,6.6\ncy.setEquation=x,((2+cos(t))*cos(s))\ncy.setEquation=y,((2+cos(t))*sin(s))\ncy.setEquation=z,(sin(t))\ncy.setSegmentCount=20\ncy.color=blue\ncy.spawn \n\n\n\n// Parametric curve\nhelix=parametricCurve\nhelix.setMinMax=t,-10,10\nhelix.setEquation=x,(2+cos(t))\nhelix.setEquation=y,(0)\nhelix.setEquation=z,(sin(t))\nhelix.setSegmentCount=70\nhelix.setThickness=0.2\nhelix.color=red\nhelix.spawn\n\n\n// p2 curve\nline=parametricCurve \nline.setMinMax=t,-5,5\nline.setEquation=x,(3*cos(t))\nline.setEquation=y,(3*sin(t))\nline.setEquation=z,(0)\nline.setSegmentCount=70\nline.setThickness=0.2\nline.color=gray\nline.spawn