[pstricks] Solides3d: strange result to fusion

[robert.fischer10 at arcor.de]

Hello,

below you see an example handling the fusion of two hollow cones.
One cone is completely located within the other cone. The fused
object looks a little bit strange in case of having
ngrid = a b with a not equal 1. The result is the same for
a) conecreux without using hollow
b) cone with using hollow

Description of Attachments:
1) Cones01: ngrid = 1 18
-> looks perfect
2) Cones02: ngrid = 2 18
-> looks as if there is a hole in the outer cone. You see the black inner cone (please open attachment)
3) Cones03: ngrid = 4 18
-> same as 2), but only problems with bottom line 1 and 2 (please see attachment)
4) Cones04: ngrid = 20 18
-> same as 3). Seems to be as if only the first two lines are influenced.

Code
\documentclass{minimal}
\usepackage{pst-pdf}
\usepackage{pstricks}
\usepackage{pst-solides3d}

\pagestyle{empty}

\begin{document}
		\psset{viewpoint=15 50 30,lightsrc=viewpoint,lightintensity=1.2,Decran=140}
		\begin{pspicture}(-3,0)(3,7)
			%Grid
			\psgrid[gridcolor=gray,subgridcolor=lightgray]
			%
			%Local Postscript Definitions RadtoDeg
			\pstVerb{
				/MyHS{2}def
				/MyRS{0.5}def
				/MyHP{MyHS 0.5 mul}def
				/MyRP{MyRS 1.5 mul}def
				/MyHN{MyHS 1.2 mul}def
				/MyAlpha{MyRS MyHS  atan neg}def
				/MyBeta{MyAlpha MyRP MyHP atan add}def
				/MyRN{MyHN MyBeta tan mul}def
			}
			%Enable Memory
			\psset{solidmemory}%solidmemory=true
			%
			%Nutationskegel
			\psSolid[object=conecreux,
				h=MyHN,r=MyRN,ngrid=2 18,
				RotX=180,
				fillcolor=gray,incolor=gray!50,
				action=none,name=MyConeN](0,0,MyHN)
			%
			%Spurkegel
			\psSolid[object=conecreux,
				h=MyHS,r=MyRS,ngrid=2 18,
				RotX=180,
				fillcolor=black!90,incolor=gray,
				action=none,name=MyConeS](0,0,MyHS)
			
			%Fusion
			\psSolid[object=fusion,
				base=MyConeS MyConeN,
				grid=false,opacity=0.6]
				\composeSolid
				
		\end{pspicture}
\end{document}

Have a nice weekend,
Robert.
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