Just testing my new Windows 10 pro (on a HP laptop with Intel® Core(TM)
i5-6200U Processor 2.3 GHz) using the following simple code:

difference() // or use intersection()
{
cube([4,4,4]);
sphere(2);
}

and found that

(1) at some angles it shows only the intact cube;
(2) at some angles it shows only the intact sphere (or intact negative
sphere if using difference() )
(3) at all other angles there's nothing in the preview;

So if I use the mouse to move it around, roughly about 80% of the time it
shows nothing, 10% cube and 10% sphere (or negative sphere).

Also found that:

4. without diff / intersection, both cube and/or sphere shows up normally
   (either together or one at a time)
5. render (F6) is normal;
6. hull() is normal;
7. happens in both 2015.03-2 and 2015.10.17 versions

So somehow this Win 10 pro causes difference()/interaction() to behave
abnormally in preview.

$  Runsun Pan, PhD

$ libs:

doctest ,

faces ( git ),

offline doc ( git ),

runscad.py( 1 , 2 , git );

$ tips:

hash( 1 , 2 ),

sweep ,

var( 1 , 2 ),

lerp ,

animGif ,

precision( 1 , 2 )

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For the record, the graphic driver is Inter(R) HD Graphics 520, version
10.18.15.4256, dated 7/17/2015.

$  Runsun Pan, PhD

$ libs:

doctest ,

faces ( git ),

offline doc ( git ),

runscad.py( 1 , 2 , git );

$ tips:

hash( 1 , 2 ),

sweep ,

var( 1 , 2 ),

lerp ,

animGif ,

precision( 1 , 2 )

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So far there appears to be NO win10 drivers for the IntelHD graphics cards
that work without "Goldfeather" option.
Not required for Nvidia drivers.

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In another project I'm working on, the OpenGL support for IntelHD is missing
for line widths in outline mode and dot width for dots. Having to use
spheres instead.
I think the Intel HD drivers are just subpar. We will have to wait for them
to improve. I don't think its a coding issue on OpenSCAD side. It just
doesn't work.

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