I do not know why difference() does not work for me.

Ah, sorry. I'll keep it to myself going forward.


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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, March 18, 2021 1:01 AM, Lee A <[hidden email]> wrote:

> He explained that, Difference is commented out.
> But I don't see the closing brace for module airdirector
>
> On 3/17/2021 11:52 PM, Baerdric via Discuss wrote:
>
> > Maybe I'm missing it, but I don't see the closing brace for the
> > difference.
> > Sent with ProtonMail https://protonmail.com Secure Email.
> > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > On Thursday, March 18, 2021 12:49 AM, infocean via Discuss
> > [hidden email] wrote:
> >
> > > Hi,
> > > A newbie is here.  I created this little program below, which works.
> > >  Some parameters are not shown, their value is some real numbers.
> > >  However when I uncomment the commented out 3 lines and put in the
> > > needed '}', then it does not work.  F5 does not give any message, but
> > > does not draw the airdirector().  F6 report errors:
> > > "The given mesh is not closed! Unable to convert to CGAL_Nef+Polyhedron.
> > > "The given mesh is not closed! Unable to convert to CGAL_Nef+Polyhedron.
> > > and then it also does not draw the airdiryctor()
> > > I do not want it as a solid.  I wanted to hollow it out.  That is why
> > > I create the difference of tho ellipses.  Why it is a not supported
> > > operation?  Any good tip how I can achieve what I want?  Any tip how
> > > I can copy and paste from the error log?  I am using a Mac wit
> > > Catalina and OpenSCAD is the latest stabil version.
> > > codiamo = 16;
> > > codiami = 6;
> > > // Parameters of the airdirector
> > > aidelpsl = codiamo;   //longer axis of the ellipse
> > > aidelpss = codiami;    //shorter axis of the ellipse
> > > aidthick = 0.2;    //Thickness of the airdirector
> > > // Module of the airdirector
> > > module airdirector(){
> > >     translate([-2.3,0,0])
> > >     rotate([0,90,0])
> > >     rotate_extrude(convexity=10)
> > >     translate([aidelpsl/2-1.8,0,0])
> > >     rotate(45)
> > > /* difference(){
> > >     resize([aidelpsl/3,aidelpss/3]);
> > >     circle(r=(aidelpsl-aidelpss)); */
> > > resize([(aidelpsl-aidthick)/3,(aidelpss-aidthick)/3])
> > >     circle(r=(aidelpsl-aidelpss));
> > > // Draw the airdirectors
> > >     color("Teal",0.5) render()
> > >         translate([pairdirector1,0,0])
> > >         airdirector();
> > >     color("Teal",0.5) render()
> > >         translate([pairdirector2,0,0])
> > >         mirror([1,0,0])
> > >         airdirector();
> > >
> > > Sent from the OpenSCAD mailing list archive
> > > http://forum.openscad.org/ at Nabble.com.
> >
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Also note that you need convexity= in render().

 

If you try this (to see inside) without it you will see why.

 

difference() {

  union() {

// Draw the airdirectors

    color("Teal",0.5)

    render(convexity=10)

        translate([pairdirector1,0,0])

        airdirector();

    //color("Teal",0.5)

    render(convexity=10)

        translate([pairdirector2,0,0])

        mirror([1,0,0])

        airdirector();

  }

  cube(40);

}

 

 

---

From: infocean via Discuss [mailto:[hidden email]]
Sent: Fri, 19 Mar 2021 04:34
To: [hidden email]
Cc: infocean
Subject: [OpenSCAD] Re: I do not know why difference() does not work for me.

 

As MichelatOZ pointed out, somehow my eye did not catch the”;” after the closing brace of the resize.
Yes, the form is something like that you nophead provided, and difference() is working as it should.  I made a little modification to the module, now it looks like this:

// Module of the airdirector
module airdirector(){
    translate([-2.3,0,0])
    rotate([0,90,0])
    rotate_extrude(convexity=10)
    translate([aidelpsl/2-1.8,0,0])
    rotate(45)
    resize([aidelpsl/3,aidelpss/3])
    difference(){
        circle(r=(aidelpsl-aidelpss));
        circle(r=(aidelpsl-aidelpss-10*aidthick));
        }
   
}

Thanks, again,
Infocean

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