# Pst-Solides3D Transformation of a Cube with parameter [closed]

I'm working on the example given at 4.14.3. in the documentation on Pst-Solides3d : Transformation associated with the distance to the origin.

The code is as follows

\documentclass[a4paper,10pt]{article}
\usepackage[utf8x]{inputenc}
\usepackage[english]{babel}
\usepackage[english,verbose]{layout}
\usepackage{auto-pst-pdf}
\usepackage{multido}
\usepackage{pst-solides3d}
\usepackage{fp}
\begin{document}
\begin{pspicture}(-3,-4)(4,3)
\psset{viewpoint=20 60 20 rtp2xyz,lightsrc=10 15 7,
Decran=20}
\pstVerb{
/gro {
4 dict begin
/M defpoint3d
/a 0.5 def
/b 1 a 3 sqrt mul sub def
/k M norme3d a mul b add def
M k mulv3d
end
} def}%

\psset{linewidth=.02,linecolor=gray}
\psSolid[object=cube,a=3,ngrid=9,transform=gro](0,0,0)%
\end{pspicture}
\end{document}


And transforms the cube accordingly. What I would like, is to be able to parameterize the procedure in a loop, for the parameter \a.

\documentclass[a4paper,10pt]{article}
\usepackage[utf8x]{inputenc}
\usepackage[english]{babel}
\usepackage[english,verbose]{layout}
\usepackage{auto-pst-pdf}
\usepackage{multido}
\usepackage{pst-solides3d}
\usepackage{fp}
\begin{document}
\multido{\iA=0+1}{15}{%
\FPeval{\iB}{\iA*0.5/15}%
\begin{pspicture}(-3,-4)(4,3)
\psset{viewpoint=20 60 20 rtp2xyz,lightsrc=10 15 7,
Decran=20}
\pstVerb{
/gro {
4 dict begin
/M defpoint3d
/a \iB\space def
/b 1 a 3 sqrt mul sub def
/k M norme3d a mul b add def
M k mulv3d
end
} def}%
\psset{linewidth=.02,linecolor=gray}
\psSolid[object=cube,a=3,ngrid=9,transform=gro](0,0,0)%
\end{pspicture}
\newpage
}
\end{document}


So that the parameter a varies from 0 to 0.5 (modulo 1 increment..) in 15 steps. But somehow pst-Solides3d doesn't like it when I put anything else than a number there after /a. Any solution ?

For the sake of being perfectly clear : My goal is to animate a coordinate transformation on a cube. The transformation is given by the function /gro. The target transformed cube has a transformation of parameter /a = 0.5. /a = 0 doesn't transform the cube at all. So my goal is to generate pictures with /a ranging from 0 to 0.5, that is going from untransformed to fully transformed cube. Then I'll use animategraphics to animate the transformation.

Edit: I have figured it out, all I was missing was a \space after \iB.

-

## closed as too localized by Joseph Wright♦Nov 19 '12 at 8:28

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+1 nice question; could you turn your snippet into a complete MWE? :) –  cmhughes Nov 18 '12 at 22:17
I don't know if I understand your comment correctly. I interpreted as you wanting me to expand the shortly written second code. Done :) –  Mathusalem Nov 18 '12 at 22:27
have a look at MWE –  cmhughes Nov 18 '12 at 22:35
Please present the complete code that is compilable for others to make a test. –  In PSTricks we trust Nov 18 '12 at 23:53
Sorry, I forgot to post. This is the whole code. The first one works (with pdflatex) the second one won't. –  Mathusalem Nov 19 '12 at 0:05