cube([10,10, 0.0000001]);
square(5);

Previews correctly and shows the madness of it.

On 6 February 2017 at 08:12, Torsten Paul Torsten.Paul@gmx.de wrote:

On 02/06/2017 11:05 AM, nop head wrote:

That's not really an example that could show issues.
With both sides same color, it's obviously fine as
there's nothing to interfere.

Also it might depend on the combination of OS, graphics
card and graphics driver".

Try:

cube([10,10, 0.0000001]);
color("yellow")
translate([0, 0, 0.00001])
cube([10,10, 0.0000001]);
square(5);

The yellow "cube" is obviously totally above the other
one. Yet looking from below, I'm getting some nice
Z-Fighting artifacts. From above it's mostly fine, but
even in that direction I'm getting a very small amount
of flickering. I guess that's mostly due to order of
the rendering.
( If the attached image does not make it to the forum
post, see http://imgur.com/AUoQJ3A ).

ciao,
Torsten.

Any surfaces in OpenSCAD that are close cause Z fighting. But a single
surface does not, as it has nothing to fight with, as long as back faces
are culled.

So I don't think Z fighting is a reason not to make 2D objects very thin.

On 6 February 2017 at 11:25, Ronaldo Persiano rcmpersiano@gmail.com wrote:

On 02/06/2017 12:58 PM, nop head wrote:

I think it is a reason to not make it very thin. The current
thickness is confusing, going to the other extreme and causing
different issues seems not a good idea.

I simply suggest to see how a not-so-extreme change works out.

ciao,
Torsten.

Yes but very thin causes no problems. Very close causes problems but I
don't see how that is more likely with thin.

Anyway 0.1 would be a lot better than 1 at the scales I work with but
perhaps not for others.

On 6 February 2017 at 12:03, Torsten Paul Torsten.Paul@gmx.de wrote:

Could the thickness be configurable, as well as the displayed color?

On 2/6/2017 8:19 AM, nop head wrote:

nophead wrote

I don't think, either. My intention here is to show that 2D models may be
well represented without thickness.

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scale should automatically set z component to 1 for 2D objects #1646
https://github.com/openscad/openscad/issues/1646  covers the scale issue
I mentioned, and shows how it is a problem. Being thinner would help, but
fixing scale would be better.

Not just newbies, it still gets me from time to time...

I imagine the change of thinness is not overly complex, perhaps it could be
0.01 for now, then see if it trips up anyone in the future, before going to
more complex solutions?

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