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Revealing HiddenSurfaces


Could someone help on this? Thanks.

I want to plot two things in a single 3D graph. One thing is just a
surface which I can do easily enough as ... 

model = Plot3D[(x + y)/2,
{x,0,25},{y,0,25}, PlotPoints -> 2,
Shading -> False,
HiddenSurface -> False]

where I can see the hidden surface. Superimposed on this I wanted data points
(where the ?error¹ distance between each data point and the model surface
is shown by a vertical line). I did this in two steps. First make the
error lines with the example set ... 

data = Show[Graphics3D[{Line[{{0,1.97,0.98},{0,1.97,0.99}}],
Line[{{0,8.72,4.02},{0,8.72,4.36}}],
Line[{{0,22.1,8.38},{0,22.1,11.05}}]},
Axes -> True]] 

Finally plot everything together.

Show[data, model, Shading -> False]

The problem is that I¹m unable to make the model surface transparent so
that I can see the error lines of the data points behind the surface.
Unfortunately Graphics3D doesn¹t have a HiddenSurface option (Plot3D and
Show do). Is there some way of doing this (maybe converting data to some
other kind of graphics object)? This has been bugging me and I would
really appreciate some pointers. Thanks.

David
dsmith at psy.ucsd.edu

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