This is the code I cannot  render:

//        Astroid Pendant
//        =================
a=20;
b=a360/PI;
$fn=6;
function x(t)= acos(t)*cos(t)cos(t);
function y(t)= asin(t)*sin(t)*sin(t);
module graph(r, step) {
for (t=[-b:step:b]) {
translate([x(t),y(t),0])
render()
rotate([0,90,-90])
//cylinder(2,2,2,true);
sphere(1.5);
} };

graph(3,4);

render()
translate([0,22.5,0])
rotate([0,90,0])
rotate_extrude(convexity = 10)
translate([2, 0, 0])
circle(.5);

//x(t) = r cos(t)^3,
//y(t) = r sin(t)^3,

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Jaacov, I've taken the liberty of moding your code a bit:

using hull to join adjacent pairs of spheres
reducing the number of spheres created - only 1 revolution needed
adding a parameter to the graph module to separately control the number of
sides of the astroid

With the given parameters, it renders in a couple of minutes for me

Regards

Chris

//        Astroid Pendant

//        =================
a=20;
function x(t)= a*cos(t)*cos(t)cos(t);
function y(t)= asin(t)*sin(t)*sin(t);

module graph(r, step, sides, max=360) {
for (t=[0:step:max]) {
hull() {
translate([x(t),y(t),0])  sphere(r,$fn=sides);
translate([x(t+step),y(t+step),0])  sphere(r,$fn=sides);

   }

}
};

graph(1,4,12);

$fn=6;
render()
translate([0,22.5,0])
rotate([0,90,0])
rotate_extrude(convexity = 10)
translate([2, 0, 0])
circle(.5);

//x(t) = r cos(t)^3,
//y(t) = r sin(t)^3,

--
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Sent from the OpenSCAD mailing list archive at Nabble.com.

Thank you very much.I liked your approach.It also gave a smoother finish to the model.
I am using OpenScad to create 3D printed models.You are invited to visit my shop at:http://www.shapeways.com/shops/jacobs
This are some more links to my advertising: 
https://www.youtube.com/watch?v=1lbw6H9tzbkhttps://twitter.com/ymolchohttps://www.instagram.com/ymolcho12/Jaacov Molcho
 

  From: kitwallace [via OpenSCAD] <ml-node+s1091067n21267h13@n5.nabble.com>

To: Jaacov Molcho ymolcho12@yahoo.com
Sent: Monday, April 17, 2017 7:07 PM
Subject: Re: Can anyone help me to render my model.

Jaacov, I've taken the liberty of moding your code a bit:

using hull to join adjacent pairs of spheres
reducing the number of spheres created - only 1 revolution needed
adding a parameter to the graph module to separately control the number of sides of the astroid

With the given parameters, it renders in a couple of minutes for me

Regards

Chris

//         Astroid Pendant

//        =================
a=20;  
function x(t)= a*cos(t)*cos(t)cos(t);
function y(t)= asin(t)*sin(t)*sin(t);

module graph(r, step, sides, max=360) {
   for (t=[0:step:max]) {
       hull() {
           translate([x(t),y(t),0])   sphere(r,$fn=sides);
           translate([x(t+step),y(t+step),0])   sphere(r,$fn=sides);
           
       }
   }
};

graph(1,4,12);

$fn=6;
render()
translate([0,22.5,0])
rotate([0,90,0])
rotate_extrude(convexity = 10)
translate([2, 0, 0])
circle(.5);

//x(t) = r cos(t)^3,
//y(t) = r sin(t)^3,

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NAML

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