\documentclass{minimal} \usepackage{pstricks} \usepackage{pst-3dplot} \pagestyle{empty} \begin{document} \begin{pspicture}(-1,-5)(15,2.5) \psset{Alpha=20} \pstThreeDCoor[yMax=25] \parametricplotThreeD[xPlotpoints=200,% linecolor=blue,linewidth=1.5pt,linestyle=solid,plotstyle=curve](0,720)% { 0 t 180 div 6 mul t sin 2.5 mul } \parametricplotThreeD[xPlotpoints=200,linecolor=red,linewidth=1.5pt,% linestyle=solid,plotstyle=curve](0,720)% { t sin 2.5 mul t 180 div 6 mul 0 } \psset{arrows=->,arrowscale=1.5,linewidth=0.5pt} \parametricplotThreeD[yPlotpoints=44,linecolor=red](0,2.5)(15,720)% { u sin t mul u 180 div 6 mul 0 } \parametricplotThreeD[linecolor=blue,yPlotpoints=44](0,2.5)(0,720)% { 0 u 180 div 6 mul u sin t mul } \end{pspicture} \end{document}