<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yiv3750872394"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_17992" style="">Dear list,</div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_17995" style=""> I have a problem with an intersection between a plan and a function (the equation of the function is downloaded from PSTricks main web page).</div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_17996" style=""><br class="yiv3750872394" style=""></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_17997" style="background-color:transparent;">I
need to have the intersection with the function and the plan y=1.5 and to have a red line marking the inersection. Here is the code:</div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_17998" style="background-color:transparent;"><br class="yiv3750872394" style=""></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_17999" style="background-color:transparent;"><span id="yiv3750872394yui_3_16_0_1_1411761221692_18007" style="color:rgb(205, 35, 44);font-size:13px;" class="yiv3750872394">\documentclass[12pt]{article}</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18000" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394">\usepackage{pst-solides3d}</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18001" style="background-color:transparent;"><span style="color:rgb(205, 35,
44);font-size:small;" class="yiv3750872394">\pagestyle{empty}</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18002" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394"><br class="yiv3750872394" style=""></span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18008" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394">\begin{document}</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18009" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394"><br class="yiv3750872394" style=""></span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18011" style="background-color:transparent;"><span id="yiv3750872394yui_3_16_0_1_1411761221692_18010"
style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394">\psset{viewpoint=50 70 20 rtp2xyz,Decran=50,lightsrc=viewpoint}</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18012" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394">\begin{pspicture}(-7,-8)(7,8)</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18014" style="background-color:transparent;"><span id="yiv3750872394yui_3_16_0_1_1411761221692_18013" style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394">{\psset{object=courbe,r=0,linecolor=blue,resolution=360,range=-5 5}<span style="background-color:transparent;" class="yiv3750872394">}</span></span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18016" style="background-color:transparent;"><span id="yiv3750872394yui_3_16_0_1_1411761221692_18015"
style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394">\psSurface[name=FUNC,ngrid=.15 .15,fillcolor=green!30,incolor=gray!30,</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18017" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394"> linewidth=0.4pt,algebraic](-4,-4)(4,4)%</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18019" style="background-color:transparent;"><span id="yiv3750872394yui_3_16_0_1_1411761221692_18018" style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394"> { 15*(x^3-x*y^4-x/5)*Euler^(-x^2-y^2)+2*Euler^(-((x-1.225)^2+y^2)) }</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18020" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;"
class="yiv3750872394">\axesIIID[linecolor=gray](0,0,0)(7,7,5)</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18021" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394"><br class="yiv3750872394" style=""></span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18022" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394">\psSolid[object=plan,definition=equation,</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18023" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:13px;" class="yiv3750872394"> args={[0 1 0 -1.5]},</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18024" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;"
class="yiv3750872394"> base=-25 -5 -15 5,ngrid=40 40,fillcolor=blue!30,</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18025" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394"> name=PLANE,action=none]</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18026" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394"> \psSolid[object=fusion,base=PLANE_s FUNC]</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18027" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394"><br class="yiv3750872394" style=""></span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18028" style="background-color:transparent;"><span
style="color:rgb(205, 35, 44);font-size:small;" class="yiv3750872394">\end{pspicture}</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18029" style="background-color:transparent;"><span style="color:rgb(205, 35, 44);font-size:13px;" class="yiv3750872394">\end{document}</span></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18030" style="color:rgb(205, 35, 44);font-size:13px;background-color:transparent;"><br class="yiv3750872394" style=""></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18031" style="background-color:transparent;">The problem is: I have no plan in the output ...</div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18032" style="background-color:transparent;"><br class="yiv3750872394" style=""></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18033" style="background-color:transparent;">Thank you
very much for the help!</div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18034" style="background-color:transparent;"><br class="yiv3750872394" style=""></div><div class="yiv3750872394" id="yiv3750872394yui_3_16_0_1_1411761221692_18035" style="background-color:transparent;">Carlo</div><div class="yiv3750872394" style="" id="yiv3750872394yui_3_16_0_9_1411761221692_6"><br class="yiv3750872394" style=""></div><div id="yiv3750872394" class="yiv3750872394" style=""><div class="yiv3750872394" style=""><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);" class="yiv3750872394"><div id="yiv3750872394yui_3_16_0_1_1411761221692_17630" class="yiv3750872394" style=""></div></div></div></div></div></div></div></div></body></html>