# Unintended edge extensions in 3D Cube rendering

I have arranged a certain configuration of cubes in 3D using the following code:

 Graphics3D[
Table[
{Cuboid[{i, j - i + 1, j + 1}]},
{i, 1, 4, 1}, {j, 1, 4, 1}], Lighting -> {{"Ambient", White}},
Boxed -> False, ViewPoint -> {-1, -1, 1}]


Computing this as it is displays the following graphic:

This is fine, but the issue is what happens when you zoom in to this image in Mathematica. Doing so reveals extended edges in some of the corners shown here:

I would like to know why this is happening, and what I need to do to get rid of the extended edges. Is this perhaps happening because Mathematica is not completely updating the graphics upon zooming?

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I see the same problem (ver. 8.0.4 OS X). After some experimentation I found that {Opacity[0.99], Table[{Cuboid[{i, j - i + 1, j + 1}]}, {i, 1, 4, 1}, {j, 1, 4, 1}]} is a workaround. – Stephen Luttrell Dec 5 '12 at 0:31
@StephenLuttrell, with Opacity[0.99] I still see the problem 8.0.4 on Win7x64. – s0rce Dec 5 '12 at 0:35
With Opacity[1] I see the problem on OS X, but Opacity[0.99] fixes it. – Stephen Luttrell Dec 5 '12 at 0:37
Same on Linux, Opacity[0.99] fixes it. – Andreas Lauschke Dec 5 '12 at 1:14
Linux and 8.0.4 64 bit , I still see the problem with Opacity[0.99]. – image_doctor Dec 5 '12 at 12:51