<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Thanks again. Of course this output is superior to the previous, but (I think like you) I remain puzzled by why the order of giving the planes and projections made the second curve show up.<div><br></div><div>There is now also a new puzzle: while the range for the red curve in your code is from -1, the curve actually starts much later (the function in question, 4*x*x, should be as high at x=-1 as the other, blue curve (y*y) is at y=2. But it isn't. Equally mysterious is the fact that when I tried to change the range of the function ycutfcn (the red curve) from -1 0 to -2 0, which should have had a huge effect, it had no effect whatsoever. I get the same curve whether the range is -1 0, -1.5 0, or -2 0.<br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; "><br></font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">OK, I am not going to use the opacity option, but my reason for using opacity =0 was to try to make the two planes transparent, or at least translucent. Again, the use of opacity appears to have no effect in the context of this example.</font></p><div><br></div><div>This example appears to me curiouser and curiouser, as Alice would have said... :-)</div><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; "><br class="Apple-interchange-newline">Zbigniew Nitecki</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Department of Mathematics</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Tufts University</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Medford, MA 02155</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><br></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">telephones:</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Office<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3843</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Dept.<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3234</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Dept. fax<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3966</font></p><a href="http://www.tufts.edu/~znitecki/">http://www.tufts.edu/~znitecki/</a></span>
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<br><div><div>On Aug 30, 2010, at 16:56, Herbert Voss wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Am 30.08.2010 15:43, schrieb Zbigniew Nitecki:<br><blockquote type="cite">Thanks, Herbert.<br></blockquote><blockquote type="cite">I hope that my inclusion of the picture doesn't make this too large to post (I <br></blockquote><blockquote type="cite">am not so adept at posting a picture on my web page).<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">This eliminates the \psset{plan=??}, and (after some fiddling) I managed to get <br></blockquote><blockquote type="cite">the two planes intersecting properly. However, while the first projected curve <br></blockquote><blockquote type="cite">(blue) shows up fine, the second (red) does not. This is true even if I comment <br></blockquote><blockquote type="cite">out all references to the first (blue) plane and the curve on it. I thought that <br></blockquote><blockquote type="cite">maybe it was projecting on the "back side" of the red plane, but it fails to <br></blockquote><blockquote type="cite">appear whether I rotate it 180 degrees or not.<br></blockquote><br>do not use opacity=0, use a value > 0 or didn't use the option.<br>0 means totally transparent, which is the same as not seen.<br><br>However, I do not really understand, why changing the<br>order of the two planes helped. It was more a trial and error<br>methode to find a working example than understanding the<br>problem ...<br><br>\documentclass[11pt]{article}<br>\usepackage{pst-solides3d}<br><br>\begin{document}<br>\begin{pspicture}(-3,-1.5)(3,5.5)<br>\psset{unit=0.35,lightsrc=40 50 50,viewpoint=18 65 30 rtp2xyz,solidmemory}<br>\psSolid[object=plan,<br>definition=equation,<br>args={[1 0 0 0] 90},<br>base=-2 2 -0.5 4.5,<br>fillcolor=blue!10,<br>name=xplane,<br>ngrid=10 10,<br>action=none<br>]<br>\psSolid[object=plan,<br>definition=equation,<br>args={[0 1 0 0] 180},<br>base=-2 2 -0.5 4.5,<br>fillcolor=red!10,<br>name=yplane,<br>ngrid=10 10,<br>action=none<br>]<br>\psSolid[object=fusion,<br>base=xplane_s yplane_s,<br>]<br>\composeSolid%<br>%<br>\psSolid[object=plan,<br>definition=equation,<br>args={[0 1 0 0] 180},<br>base=-2 2 -0.5 4.5,<br>name=yplane,<br>linewidth=0.5pt,<br>ngrid=10 10,<br>action=none,<br>]<br>\psSolid[object=plan,<br>definition=equation,<br>args={[1 0 0 0] 90},<br>base=-2 2 -0.5 4.5,<br>name=xplane,<br>ngrid=10 10,<br>action=none,<br>]<br>\defFunction[algebraic]{xcutfcn}(y){y*y}{}{}%<br>\psProjection[object=courbe,<br>linecolor=blue,<br>linewidth=2pt,<br>plan=xplane,<br>range=0 2,<br>resolution=720,<br>function=xcutfcn,<br>action=draw**,<br>]<br>\defFunction[algebraic]{ycutfcn}(x){4*x*x}{}{}%<br>\psProjection[object=courbe,<br>linecolor=red,<br>linewidth=2pt,<br>plan=yplane,<br>range=-1 0,<br>resolution=720,<br>function=ycutfcn,<br>action=draw**,<br>]<br>\end{pspicture}<br><br>\end{document}<br><br><br>Herbert<br>_______________________________________________<br>PSTricks mailing list<br><a href="mailto:PSTricks@tug.org">PSTricks@tug.org</a><br>http://tug.org/mailman/listinfo/pstricks<br>archive: http://www.tug.org/pipermail/pstricks/<br></div></blockquote></div><br></div></body></html>