// Helen Xu.bvr \n \n// Parametric planeA\npA=parametricSurface \npA.setMinMax=t,-2,2\npA.setMinMax=s,-2,2 \npA.setEquation=x,(-t) \npA.setEquation=y,(t) \npA.setEquation=z,(s) \npA.setSegmentCount=20\npA.color=magenta \npA.spawn \n \n// Parametric planeB\npB=parametricSurface\npB.setMinMax=s,-2,2\npB.setMinMax=t,-2,2\npB.setEquation=x,(t) \npB.setEquation=y,(0) \npB.setEquation=z,(s) \npB.setSegmentCount=20 \npB.color=green\npB.spawn\n// Parametric intersection\ninter=line\ninter.setMinMax=t,-2,2\ninter.setEquation=x,(0)\ninter.setEquation=y,(0)\ninter.setEquation=z,(t)\ninter.setSegmentCount=20\ninter.color=yellow\ninter.setThickness=0.2\ninter.spawn