[pstricks] how can I do transparent a solid?

[Herbert Voss]

Am 19.11.2009 17:15, schrieb mary montenegro:

> I would like to be able to use pstricks solides-3d to draw a transparent solid.
> I have successfully constructed a graph using this code:
> 
> \begin{pspicture}[showgrid=false](-4,-2)(3,3.5)
>  \psset{viewpoint=100 27.5 20,Decran=60}
>  \psSolid[object=face,base=0 -3 9 -3  9 3 0 3,action=draw*,fillcolor=white,linestyle=dashed]
>  \defFunction{F}(t){t 2 exp}{t}{}
>  \psSolid[object=face,base=3 -3 {F} CourbeR2+,resolution=360,action=draw]
>  \psSolid[object=face,base=3.25 3 {F} CourbeR2+,resolution=360,action=draw]
>  \psSolid[object=face,base=-3 -3.25 {F} CourbeR2+,resolution=360,action=draw]
>  \psSolid[object=plan,definition=equation,args={[1 0 0 -9]},base=-5 0 -3 3,action=draw*,
>  fillcolor=gray!20,fillstyle=opacity]% this is the solid that I need to be transparnt

 fillcolor=gray!20,opacity=0.4]

Herbert


>  \axesIIID[showOrigin=true](0,-5,0)(14,4,5)
> \end{pspicture}
> 
> It constructs a parbola in the plane xy and a parallel plane to axes z.
> The plane is gray color and it don't  permit see the parabola.
> 
> How can I do visible the parabola with this gray plane above?