[pstricks] vanishing plane

Jon Joseph josco.jon at gmail.com
Sat Jun 9 18:39:46 CEST 2012 

Ok. I get it. But I gotta say that just seems wrong given the fact that my cylindrical surface is still visible from both viewpoints even though it also has a front and a back.

Thanks for your help.  Jon


On Jun 9, 2012, at 11:28 AM, pstricks-request at tug.org wrote:

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> Today's Topics:
> 
>   1. vanishing plane as function of viewpoint (Jon Joseph)
>   2.  problem with pscustom (Kin Mye)
>   3. Re: vanishing plane as function of viewpoint (Herbert Voss)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sat, 9 Jun 2012 10:28:52 -0500
> From: Jon Joseph <josco.jon at gmail.com>
> To: <pstricks at tug.org>
> Subject: [pstricks] vanishing plane as function of viewpoint
> Message-ID: <99557E44-5C86-45E8-8F61-75A4FB7236E1 at gmail.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> Once again I am doing battle with the pst-solides3d package.  Can someone explain to me why the tangent plane vanishes when I change the viewpoint?  
> 
> 
> \documentclass[12pt]{article}
> \usepackage[letterpaper,asymmetric=true, total={18cm,22cm}, 
> 		top=3cm, bindingoffset=1cm]{geometry}
> \usepackage[svgnames]{pstricks}
> \usepackage{pst-plot,pst-infixplot}
> \usepackage{pst-eucl}
> \usepackage{pst-fun, pst-coil}
> \usepackage{pst-solides3d}
> \usepackage{pst-fun}
> \usepackage{pstricks-add}
> 
> 
> \begin{document}
> 
> % With this viewpoint everything draws correctly
> 
> \psset{viewpoint=30 10 30, Decran=50}
> \begin{pspicture}[showgrid=false](-1.5,-3)(6.5,6) 
> \psSolid[object=grille,base=-3 3 -1 6,action=draw**, fillcolor=gray!20] 
> 
> \defFunction[algebraic]{G5}(t)
> {t}{0.5*t^2}{0} 
> \defFunction[algebraic]{G6}(t)
> {t}{0.5*t^2}{4} 
> 
> \psSolid[object=plan,  definition=equation, fillcolor=Aquamarine, args={[0 1 0 0] }, base=-3 3 -4 0]  % Tangent plane
> 
> 
> \psSolid[object=cylindre, range=-3 2,h=4, function=G5, axe=0 0 1, incolor=cyan!50, fillcolor=yellow!50, ngrid=3 8]
> 
> \axesIIID(0,4.5,0)(4,6,5)
> \end{pspicture}
> 
> 
> % Changed the viewpoint and the plane disappears
> 
> \psset{viewpoint=30 -10 30, Decran=50}
> \begin{pspicture}[showgrid=false](-1.5,-3)(6.5,6) 
> \psSolid[object=grille,base=-3 3 -1 6,action=draw**, fillcolor=gray!20] 
> 
> \defFunction[algebraic]{G5}(t)
> {t}{0.5*t^2}{0} 
> \defFunction[algebraic]{G6}(t)
> {t}{0.5*t^2}{4} 
> 
> \psSolid[object=plan,  definition=equation, fillcolor=Aquamarine, args={[0 1 0 0] }, base=-3 3 -4 0]  % Tangent plane - oops? Where did it go?
> 
> 
> \psSolid[object=cylindre, range=-3 2,h=4, function=G5, axe=0 0 1, incolor=cyan!50, fillcolor=yellow!50, ngrid=3 8]
> 
> \axesIIID(0,4.5,0)(4,6,5)
> \end{pspicture}
> 
> 
> \end{document}
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Sat, 9 Jun 2012 18:21:38 +0200
> From: Kin Mye <kinmye at gmail.com>
> To: Graphics with PSTricks <pstricks at tug.org>
> Subject: [pstricks]  problem with pscustom
> Message-ID:
> 	<CAMsKjuBECxLdMqHkBwsq2tPvqv=HfEprpZYJN84UDdrAGY218A at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
> 
>> download>http://archiv.dante.de/~herbert/Ubuntu/eitl.sh <http://archiv.dante.de/%7Eherbert/Ububtu/eitl.sh>
> 
>> make it executable with "chmod 744 eitl.sh"
>> and run it with "./eitl.sh"
> 
> Dear Herbert,
> Thank you very much for this script. I have run it without any
> problem. Now I have an updated version!
> 
> The bad news is that the update did not solve the problem ...
> The good news: I manage to narrow down the problem. It seems it is
> related with 'evince', the pdf viewer.
> 
> The process I follow: latex + dvips + ps2pdf14 and evince to see the .pdf.
> 
> - evince myfile.ps : ok
> - evince myfile.pdf: wrong (see the atached png)
> - acroread myfile.pdf: ok
> - print from evince myfile.pdf: printing ok.
> 
> I attach the .pdf file and the screenshot of what I see with evince myfile.pdf.
> 
> I have done around 100 figures with pstricks (mainly psplot and block diagrams)
> and the only problem I have found is the one I mention here: drawing
> the area under a function.
> This happened from approx. 2 years ago.
> 
> BR.
> 
> \listfiles
> \documentclass{article}
> \usepackage{pstricks-add}
> \begin{document}
> \begin{pspicture}(-1,-1)(3,6)
> \pscustom[algebraic,linestyle=none,fillstyle=hlines]{%
>     \psplot{0}{1.5}{x^2}
>     \psline(1.5,0)(0,0)
> }
> \psaxes{->}(3,4)
> \psplot[algebraic]{0}{2}{x^2}
> \end{pspicture}
> \end{document}
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> 
> ------------------------------
> 
> Message: 3
> Date: Sat, 9 Jun 2012 18:28:34 +0200
> From: Herbert Voss <Herbert.Voss at FU-Berlin.DE>
> To: Graphics with PSTricks <pstricks at tug.org>
> Subject: Re: [pstricks] vanishing plane as function of viewpoint
> Message-ID: <4FD379B2.5050503 at FU-Berlin.DE>
> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed
> 
> Am 09.06.2012 17:28, schrieb Jon Joseph:
>> Once again I am doing battle with the pst-solides3d package.  Can someone explain to me why the tangent plane vanishes when I change the viewpoint?
> 
>> \psSolid[object=plan,  definition=equation, fillcolor=Aquamarine, args={[0 1 0 0] }, base=-3 3 -4 0]  % Tangent plane
> 
> that plane has only _one_ visible face, the one on the back is
> _not_ visible by definition. You change the viewpoint in a way
> that the plane is seen from it's back side which is not visible.
> Change the definition of the plane so that it's direction vector
> points to the viewpoint, eg args={[0 -1 0 0] 180}:
> 
> \documentclass{article}
> \usepackage[svgnames]{pstricks}
> \usepackage{pst-solides3d}
> \begin{document}
> % With this viewpoint everything draws correctly
> 
> \psset{viewpoint=30 10 30, Decran=50}
> \begin{pspicture}[showgrid=false](-1.5,-3)(6.5,6)
> \psSolid[object=grille,base=-3 3 -1 6,action=draw**,fillcolor=gray!20]
> \defFunction[algebraic]{G5}(t){t}{0.5*t^2}{0}
> \defFunction[algebraic]{G6}(t){t}{0.5*t^2}{4}
> \psSolid[object=plan,definition=equation,fillcolor=Aquamarine,
>   incolor=black!10,args={[0 1 0 0] }, base=-3 3 -4 0]  % Tangent plane
> \psSolid[object=cylindre,range=-3 2,h=4,function=G5,axe=0 0 1,
>   incolor=cyan!50, fillcolor=yellow!50, ngrid=3 8]
> \axesIIID(0,4.5,0)(4,6,5)
> \end{pspicture}
> % Changed the viewpoint and the plane disappears
> 
> \psset{viewpoint=30 -10 30, Decran=50}
> \begin{pspicture}[showgrid=false](-1.5,-3)(6.5,6)
> \psSolid[object=grille,base=-3 3 -1 6,action=draw**, fillcolor=gray!20]
> \defFunction[algebraic]{G5}(t){t}{0.5*t^2}{0}
> \defFunction[algebraic]{G6}(t){t}{0.5*t^2}{4}
> \psSolid[object=cylindre, range=-3 2,h=4, function=G5, axe=0 0 1,
>   incolor=cyan!50, fillcolor=yellow!50, ngrid=3 8]
> \psSolid[object=plan,definition=equation, fillcolor=Aquamarine,
>   args={[0 -1 0 0] 180}, base=-3 3 -4 0]
> \axesIIID(0,4.5,0)(4,6,5)
> \end{pspicture}
> 
> \end{document}
> 
> Herbert
> 
> 
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