//demo cad
/*
 short length of 3 start whitworth thread
 two coloured intersected cubes with a hole through them
 some hulled 2d ish shapes
 */


a= thread("whitworth",25,30,64,8,bevel=12,starts=3)     // thread

// the two cubes

b=cube([20,20,20], center=true)
c= cube([40,10,10])
c=translate(c,[-20,-3,-2])
b.color="green"
c.color="red"
d= union([b,c])
hole= cylinder (d1=8,d2=4,h=50,center=true)
d= difference(d,hole)
d.color="blue"                                        // blue cubes

// a boolean on different colored items, gives the final color to be grey

// keep colors

b2= difference(b,hole)
b2.color="green"
c2= difference(c,hole)
c2.color="red"
d2c=[b2,c2]     // cubes in original colors


c= circle3d(d=25)
c=rotate(c,[45,45,45])
s=square3d([20,30])
s=hull([s,c])      // hulled planes, sort of


// move to show all at once

d=translate(d,[0,0,30])
a=translate(a,[40,0,0])
s=translate(s,[40,0,50])
some= [a,d,s]
//show_obj(some,d2c)
show_ply(some,d2c)
//show_scad(some,d2c)

// check thread
verbose_set_global(true)
v= verify(a)
v= repair (a)
a=verify (v)

/*  results of verbose verify for a
[verify] Shape 0: verts=14746 tris=29236 status=NoError
[verify] verts=14746 tris=29236
[verify] degenerate or zero-area tri count=426
[verify] edges=43854 boundary=0 nonmanifold=0
[verify] RESULT: Issues detected
*/

// showing some help  (part of)

 ? thread

 /*
 === thread ===

Creates a threaded cylinder with helical threads, multi-start support, and beveled ends. Sensible defaults for quick testing.

Parameters:
profile : string or array - "acme", "whitworth", "buttress", "60_degree", "square",or [[x,y],...] array or variable name (default "60_degree")
diameter : float  - Outer thread diameter (major diameter, default 10)
length   : float  - Final thread length (default 50)
segments : int    - Number of facets per revolution (default 32)
pitch    : float  - Distance between thread crests (default 2)
depth    : float  - Thread depth (radial, default 0.5*pitch - not used for 60_degree)
bevel    : float  - Chamfer height at top/bottom (default 0)
starts   : int    - Number of thread starts (default 1)

Quick Example:
th = thread("60_degree")

For more:
  ? thread full       - Complete documentation
  ? thread examples   - More examples
  ? thread algorithm  - Implementation details

*/