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>-----Original Message-----
>From: Bruce Colletti [mailto:vze269bv at verizon.net] 
To: mathgroup at smc.vnet.net
>Sent: Tuesday, February 15, 2005 3:51 AM
>To: mathgroup at smc.vnet.net
>Subject: [mg54279] [mg54248] Missing Graphics
>
>Re Mathematica 5.1.
>
>This code displays (as intended) five versions of g (first two 
>are same):
>
>g = Plot3D[Sin@x Cos@y, {x, -PI, PI}, {y, -PI, PI}];
>
>Scan[Show@#@g &, {SurfaceGraphics, Graphics, ContourGraphics, 
>    DensityGraphics}];
>
>However, when DisplayFunction->Identity is added to Plot3D, 
>only the SurfaceGraphics plot appears.  Why don't the others?
>
>Thankx.
>
>Bruce
>
>

Bruce,

it's not the SurfaceGraphics which appears -- that would be queer -- yet
the Graphics, which is ok, see:

In[10]:= Options[#[g], DisplayFunction] & /@ 
  {SurfaceGraphics, Graphics, ContourGraphics, DensityGraphics}

>From In[10]:=
Options::"optnf": DisplayFunction is not a known option for - Graphics -

Out[10]=
{{DisplayFunction -> Identity}, {}, {DisplayFunction -> Identity},
{DisplayFunction -> Identity}}


As DisplayFunction is no option for Graphics it cannot be retained; in
fact no option of g is retained. If you look at

In[13]:= Options[g]

you'll indeed note that none of those would make sense after the
conversion of g to a 2D object.


--
Hartmut Wolf


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