[pstricks] [pst-vue3d, pst-3dplot] Meaning of Dobs and Decran

Patrick Drechsler patrick at pdrechsler.de
Wed Feb 7 00:12:14 CET 2007


Hi,

please ignore my ignorance of the french language, but what do the
parameter "Dobs" and "Decran" mean and how do these parameters
influence things in the package "pst-vue3d"? Expecially how these
parameters influence scaling of the output is a mystery to me.

A brief look in the documentation as well as the code of pst-vue3d did
not get me any further. I only find lines such as

--8<---------------cut here---------------start------------->8---
6 matches for "Dobs" in buffer: pst-vue3d.tex
     64:\define at key[psset]{pst-vue3d}{Dobs}{\def\psk at TroisD@Dobs{#1}}
     68:    Dobs=100,Decran=10,%
    134:    /Dobs \psk at TroisD@Dobs\space def
    144:    /XpointVue Dobs Cos1Cos2 mul def
    145:    /YpointVue Dobs Sin1Cos2 mul def
    146:    /ZpointVue Dobs Sin2 mul def
2 matches for "Decran" in buffer: pst-vue3d.tex
     65:\define at key[psset]{pst-vue3d}{Decran}{\def\psk at TroisD@Ecran{#1}}
     68:    Dobs=100,Decran=10,%
--8<---------------cut here---------------end--------------->8---

I have tried to understand how Herbert included Manuel's
"\SphereThreeD" into pst-3dplot ("\pstThreeDSphere"). I have adopted
this feature for cylinders (and it appears to work), but I do not
understand how it works.

--8<---------------cut here---------------start------------->8---
\makeatletter
\def\pstThreeDCylinder{\@ifnextchar[{\pst at ThreeDCylinder}{\pst at ThreeDCylinder[]}}
\def\pst at ThreeDCylinder[#1](#2,#3,#4)#5#6{{%
  \psset{THETA=\psk at ThreeDplot@Beta,PHI=\psk at ThreeDplot@Beta,Dobs=10,Decran=10}%
  \psset{#1}%
  \pstThreeDNode(#2,#3,#4){CylinderCenter}%
  \rput(CylinderCenter){\CylindreThreeD(0,0,0){#5}{#6}}%
}\ignorespaces}
\makeatother
--8<---------------cut here---------------end--------------->8---

Thankful for any pointers,

Patrick

,----
| pst-3dplot.sty    2004/07/15 package wrapper for pst-3dplot.tex (hv)
| pstricks.sty    2005/12/19 v0.31 LaTeX wrapper for `PSTricks' (RN,HV)
| pstricks.tex    2005/12/22 v1.14 `PSTricks' (tvz)
|   xcolor.sty    2007/01/21 v2.11 LaTeX color extensions (UK)
|    color.cfg    2001/08/31 v1.1 color configuration of teTeX/TeXLive
|    dvips.def    1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
| pst-3dplot.tex    2005/02/19 v1.63 `PST-3dplot' (hv)
| pst-xkey.tex    2005/02/22 v1.5 PSTricks specialization of xkeyval (HA)
|  xkeyval.sty    2005/08/12 v2.5d package option processing (HA)
|  xkeyval.tex    2005/08/12 v2.5d key=value parser (HA)
| pst-vue3d.sty    2000/07/15 package wrapper for pst-vue3d.tex (ML)
| pst-vue3d.tex    2005/02/19 v1.63 `PST-VUE3D' (ML)
`----

-- 
In the movie Ghostbusters, there's a sign in the background of
one scene that says, "Danger! 10,000 Ohms!" I cannot explain to
laymen why people like me think that is uproariously funny.
-- Steven den Beste




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