[pstricks] still confused by fusion

[Zbigniew Nitecki]

I've had a lot of help so far with this particular mini-project, 
and have succeeded in creating the ingredients for the figure I want.
But the fusion part still eludes me.  Can anyone explain the behavior noted below?
*******************************************************************************
First, the following code, in which each element is separate and has an "action=draw**" command,
produces the picture shown after the code:
> % !TEX TS-program = latex
> \listfiles
> \documentclass[11pt]{article}
> \usepackage{pst-solides3d, pst-3dplot, pst-math,pstricks-add}
> \usepackage{pst-3d}
> \begin{document}
> 		\begin{pspicture}(-0.5,-2)(3,3)
> %				\psset{solidmemory}
> 				\psset{lightsrc=50 20 50, viewpoint=15 60 70 rtp2xyz,
> 					Decran=50}
> 
> 				\psSurface[
> 					 fillcolor=gray,
> 					 incolor=green,
> 					 ngrid=0.1 0.1,
> 					 algebraic,
> 					 grid,% comment it out to see meaning of ngrid
> 					 action=draw**,
> %					action=none,
> %					name=graphsurf,
> 				](-1,-1.5)(1,1.5){ (x^2-3*y^2)/2 }
> %
> 				\defFunction[algebraic]{curvey}(t){t}{1} {0.5*t^2-1.5}
> 				\psSolid[%
> 					object=courbe,
> 					r=0.01,
> 					range=-1.0 1.0,
> 					resolution=720,
> 					linecolor=blue,
> 					linewidth=1pt,
> 					function=curvey,
> 					action=draw**,
> %					action=none,
> %					name=curvey,
> 				]%
> 			\defFunction[algebraic]{curvex}(t){0.5}{t} {0.125-1.5*t^2}
> 			\psSolid[%
> 				object=courbe,
> 				r=0.01,
> 				range=-1.5 1.5,
> 				resolution=720,
> 				linecolor=lightgray, 
> 				linewidth=1pt,
> 				function=curvex,
> 				action=draw**,
> %				action=none,
> %				name=curvex,
> 				]%
> %			\psSolid[
> %				object=fusion,
> %				action=draw**,
> %				base=graphsurf curvey curvex,
> %				]
> %			\composeSolid
> 				
> 		\end{pspicture}
> \end{document}


*********************************************************************************************************
However, when I comment out all the "action=draw**" commands and replace them with "action=none, name=<>"
and also uncomment the solidmemory at the start and the \psSolid[object=fusion,... as well as \compose Solid,
as shown below, I get the error message that follows the code:
% !TEX TS-program = latex
\listfiles
\documentclass[11pt]{article}
\usepackage{pst-solides3d, pst-3dplot, pst-math,pstricks-add}
\usepackage{pst-3d}
\begin{document}
		\begin{pspicture}(-0.5,-2)(3,3)
				\psset{solidmemory}
				\psset{lightsrc=50 20 50, viewpoint=15 60 70 rtp2xyz,
					Decran=50}

				\psSurface[
					 fillcolor=gray,
					 incolor=green,
					 ngrid=0.1 0.1,
					 algebraic,
					 grid,% comment it out to see meaning of ngrid
%					 action=draw**,
					action=none,
					name=graphsurf,
				](-1,-1.5)(1,1.5){ (x^2-3*y^2)/2 }
%
				\defFunction[algebraic]{curvey}(t){t}{1} {0.5*t^2-1.5}
				\psSolid[%
					object=courbe,
					r=0.01,
					range=-1.0 1.0,
					resolution=720,
					linecolor=blue,
					linewidth=1pt,
					function=curvey,
%					action=draw**,
					action=none,
					name=curvey,
				]%
			\defFunction[algebraic]{curvex}(t){0.5}{t} {0.125-1.5*t^2}
			\psSolid[%
				object=courbe,
				r=0.01,
				range=-1.5 1.5,
				resolution=720,
				linecolor=lightgray, 
				linewidth=1pt,
				function=curvex,
%				action=draw**,
				action=none,
				name=curvex,
				]%
			\psSolid[
				object=fusion,
				action=draw**,
				base=graphsurf curvey curvex,
				]
			\composeSolid
				
		\end{pspicture}
\end{document}

> Error: /typecheck in --get--
> Operand stack:
>    --nostringval--   -1   1   S1   -1.5   0
> Execution stack:
>    %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1862   1   3   %oparray_pop   1861   1   3   %oparray_pop   1845   1   3   %oparray_pop   1739   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   2   --nostringval--   %repeat_continue   --nostringval--
> Dictionary stack:
>    --dict:1150/1684(ro)(G)--   --dict:0/20(G)--   --dict:80/200(L)--   --dict:779/1012(L)--   --dict:175/300(L)--   --dict:38/200(L)--   --dict:184/200(L)--   --dict:779/1012(L)--   --dict:2/11(L)--   --dict:2/5(L)--
> Current allocation mode is local
> Last OS error: 2
> Current file position is 409582
> GPL Ghostscript 8.70: Unrecoverable error, exit code 1
> ### FAILED to generate /tmp/altpdflatex.69124-1280068503/pst3d test 1.3.pdf ()





Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

telephones:
Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966
http://www.tufts.edu/~znitecki/

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