/*******MODULE TO GENERATE A GRID**************

 * num = Number of points for the grid, it will generate a
 *      matrix[num][num]
 * space = space between points
 * elem = within showGrid() you can create the shape for the
 *      dots to be shown in the grid.
 * zAxis = grid will move this value along the  z Axis
 *      */
module showGrid(num=10, space=10, elem=0,zAxis=0){
    grid(num, space, elem, zAxis) {
        color("plum")sphere(.4);                    //child(0)
        color("OrangeRed")cube(.1,center=true);     //child(1)
        color("Lime")cylinder(h = .1, r=.1,$fn=28); //child(2)
    }
}
module grid(num, space, elem, zAxis) {
    translate([-space*(num-1)/2,-space*(num-1)/2, zAxis])
    for (i = [0 : num-1])
        for (j = [0 : num-1])
            translate([ space*i, space*j, zAxis ]) child(elem);
    //origin, comment if not needed
    translate([0,0,0])child(elem);
 }
//dummy value
gap = 10;

/* Example1: GRID WITH DEFAULT SETTINGS*/
*showGrid();

/* Example2: GRID WITH A GAP SPACE USING ELEM(1) */
//dummy height
myHeight =5;
*showGrid(space=gap, elem=1,zAxis=-myHeight/2);

/* Example3: MOVE GRID ON Z AXIS  USING ELEM(2) */

*showGrid(elem=2,zAxis=myHeight/2);

//dummy shape
translate([gap*2,0,0])
    cube(10,center= true);