[pstricks] Weird effect of fusion in pst-solides3d

[Nitecki, Zbigniew H.]

The code below consists of two versions of the same picture.  The commented stuff in the first is uncommented in the second;  it is what I expect I need to be able to fuse this picture with some others (like putting in a circle, some lines, and get proper hiding).  The output is attached below the code.  What is causing the drastic change in coloring/lighting?  (I put in \deactivatecolor with the intention of avoiding this problem)

\begin{pspicture*}(-3,-2.0)(3,2.0)
% \psset{solidmemory}
\psset{unit=0.5}
\psset{lightsrc=40 180 30,viewpoint=18 40 25 rtp2xyz},
\defFunction{fcone}(t,u)%
{t u cos mul}%
{t u sin mul}%
{t}%
\psSolid[object=surfaceparametree,
linecolor=gray,
base=-1 1 0 360,
fillcolor=lightgray,
incolor=lightgray,
function=fcone,
ngrid=80,
grid,
action=draw**,
% action=none,
% name=con,
]
% \psSolid[object=fusion,
% deactivatecolor,
% action=draw**,
% base=con,
% ]
% \composeSolid
\end{pspicture*}

\begin{pspicture*}(-3,-2.0)(3,2.0)
\psset{solidmemory}
\psset{unit=0.5}
\psset{lightsrc=40 180 30,viewpoint=18 40 25 rtp2xyz},
\defFunction{fcone}(t,u)%
{t u cos mul}%
{t u sin mul}%
{t}%
\psSolid[object=surfaceparametree,
linecolor=gray,
base=-1 1 0 360,
fillcolor=lightgray,
incolor=lightgray,
function=fcone,
ngrid=80,
grid,
action=draw**,
action=none,
name=con,
]
\psSolid[object=fusion,
deactivatecolor,
action=draw**,
base=con,
]
\composeSolid
\end{pspicture*}


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