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BOSL2/partitions.scad
Richard Milewski ed367099b3 Synopses partitions.scad
2023-04-03 17:58:12 -07:00

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//////////////////////////////////////////////////////////////////////
// LibFile: partitions.scad
// Cut objects with a plane, or partition them into interlocking pieces for easy printing of large objects.
// Includes:
// include <BOSL2/std.scad>
// FileGroup: Basic Modeling
// FileSummary: Cut objects with a plane or partition them into interlocking pieces.
// FileFootnotes: STD=Included in std.scad
//////////////////////////////////////////////////////////////////////
// Section: Planar Cutting
// Function&Module: half_of()
// Synopsis: Masks half of an object at a cut plane.
// Topics: Partitions, Masking
// See Also: back_half(), front_half(), left_half(), right_half(), top_half(), bottom_half()
//
// Usage: as module
// half_of(v, [cp], [s], [planar]) CHILDREN;
// Usage: as function
// result = half_of(p,v,[cp]);
//
// Description:
// Slices an object at a cut plane, and masks away everything that is on one side. The v parameter is either a plane specification or
// a normal vector. The s parameter is needed for the module
// version to control the size of the masking cube. If s is too large then the preview display will flip around and display the
// wrong half, but if it is too small it won't fully mask your model.
// When called as a function, you must supply a vnf, path or region in p. If planar is set to true for the module version the operation
// is performed in 2D and UP and DOWN are treated as equivalent to BACK and FWD respectively.
//
// Arguments:
// p = path, region or VNF to slice. (Function version)
// v = Normal of plane to slice at. Keeps everything on the side the normal points to. Default: [0,0,1] (UP)
// cp = If given as a scalar, moves the cut plane along the normal by the given amount. If given as a point, specifies a point on the cut plane. Default: [0,0,0]
// s = Mask size to use. Use a number larger than twice your object's largest axis. If you make this too large, OpenSCAD's preview rendering may display the wrong half. (Module version) Default: 100
// planar = If true, perform a 2D operation. When planar, a `v` of `UP` or `DOWN` becomes equivalent of `BACK` and `FWD` respectively. (Module version). Default: false.
//
// Examples:
// half_of(DOWN+BACK, cp=[0,-10,0]) cylinder(h=40, r1=10, r2=0, center=false);
// half_of(DOWN+LEFT, s=200) sphere(d=150);
// Example(2D):
// half_of([1,1], planar=true) circle(d=50);
module half_of(v=UP, cp, s=100, planar=false)
{
req_children($children);
cp = is_vector(v,4)? assert(cp==undef, "Don't use cp with plane definition.") plane_normal(v) * v[3] :
is_vector(cp)? cp :
is_num(cp)? cp*unit(v) :
[0,0,0];
v = is_vector(v,4)? plane_normal(v) : v;
if (cp != [0,0,0]) {
translate(cp) half_of(v=v, s=s, planar=planar) translate(-cp) children();
} else if (planar) {
v = (v==UP)? BACK : (v==DOWN)? FWD : v;
ang = atan2(v.y, v.x);
difference() {
children();
rotate(ang+90) {
back(s/2) square(s, center=true);
}
}
} else {
difference() {
children();
rot(from=UP, to=-v) {
up(s/2) cube(s, center=true);
}
}
}
}
function half_of(p, v=UP, cp) =
is_vnf(p) ?
assert(is_vector(v) && (len(v)==3 || len(v)==4),str("Must give 3-vector or plane specification",v))
assert(select(v,0,2)!=[0,0,0], "vector v must be nonzero")
let(
plane = is_vector(v,4) ? assert(cp==undef, "Don't use cp with plane definition.") v
: is_undef(cp) ? [each v, 0]
: is_num(cp) ? [each v, cp*(v*v)/norm(v)]
: assert(is_vector(cp,3),"Centerpoint must be a 3-vector")
[each v, cp*v]
)
vnf_halfspace(plane, p)
: is_path(p) || is_region(p) ?
let(
v = (v==UP)? BACK : (v==DOWN)? FWD : v,
cp = is_undef(cp) ? [0,0]
: is_num(cp) ? v*cp
: assert(is_vector(cp,2) || (is_vector(cp,3) && cp.z==0),"Centerpoint must be 2-vector")
cp
)
assert(is_vector(v,2) || (is_vector(v,3) && v.z==0),"Must give 2-vector")
assert(!all_zero(v), "Vector v must be nonzero")
let(
bounds = pointlist_bounds(move(-cp,p)),
L = 2*max(flatten(bounds)),
n = unit(v),
u = [-n.y,n.x],
box = [cp+u*L, cp+(v+u)*L, cp+(v-u)*L, cp-u*L]
)
intersection(box,p)
: assert(false, "Input must be a region, path or VNF");
/* This code cut 3d paths but leaves behind connecting line segments
is_path(p) ?
//assert(len(p[0]) == d, str("path must have dimension ", d))
let(z = [for(x=p) (x-cp)*v])
[ for(i=[0:len(p)-1]) each concat(z[i] >= 0 ? [p[i]] : [],
// we assume a closed path here;
// to make this correct for an open path,
// just replace this by [] when i==len(p)-1:
let(j=(i+1)%len(p))
// the remaining path may have flattened sections, but this cannot
// create self-intersection or whiskers:
z[i]*z[j] >= 0 ? [] : [(z[j]*p[i]-z[i]*p[j])/(z[j]-z[i])]) ]
:
*/
// Function&Module: left_half()
// Synopsis: Masks the right half of an object along the Y-Z plane, leaving the left half.
// Topics: Partitions, Masking
// See Also: back_half(), front_half(), right_half(), top_half(), bottom_half(), half_of()
//
// Usage: as module
// left_half([s], [x]) CHILDREN;
// left_half(planar=true, [s], [x]) CHILDREN;
// Usage: as function
// result = left_half(p, [x]);
//
// Description:
// Slices an object at a vertical Y-Z cut plane, and masks away everything that is right of it.
// The s parameter is needed for the module
// version to control the size of the masking cube. If s is too large then the preview display will flip around and display the
// wrong half, but if it is too small it won't fully mask your model.
//
// Arguments:
// p = VNF, region or path to slice (function version)
// s = Mask size to use. Use a number larger than twice your object's largest axis. If you make this too large, OpenSCAD's preview rendering may display the wrong half. (Module version) Default: 100
// x = The X coordinate of the cut-plane. Default: 0
// planar = If true, perform a 2D operation. (Module version) Default: false.
// Examples:
// left_half() sphere(r=20);
// left_half(x=-8) sphere(r=20);
// Example(2D):
// left_half(planar=true) circle(r=20);
module left_half(s=100, x=0, planar=false)
{
req_children($children);
dir = LEFT;
difference() {
children();
translate([x,0,0]-dir*s/2) {
if (planar) {
square(s, center=true);
} else {
cube(s, center=true);
}
}
}
}
function left_half(p,x=0) = half_of(p, LEFT, [x,0,0]);
// Function&Module: right_half()
// Synopsis: Masks the left half of an object along the Y-Z plane, leaving the right half.
// Topics: Partitions, Masking
// See Also: back_half(), front_half(), left_half(), top_half(), bottom_half(), half_of()
//
// Usage: as module
// right_half([s=], [x=]) CHILDREN;
// right_half(planar=true, [s=], [x=]) CHILDREN;
// Usage: as function
// result = right_half(p, [x=]);
//
// Description:
// Slices an object at a vertical Y-Z cut plane, and masks away everything that is left of it.
// The s parameter is needed for the module
// version to control the size of the masking cube. If s is too large then the preview display will flip around and display the
// wrong half, but if it is too small it won't fully mask your model.
// Arguments:
// p = VNF, region or path to slice (function version)
// s = Mask size to use. Use a number larger than twice your object's largest axis. If you make this too large, OpenSCAD's preview rendering may display the wrong half. (Module version) Default: 100
// x = The X coordinate of the cut-plane. Default: 0
// planar = If true, perform a 2D operation. (Module version) Default: false.
// Examples(FlatSpin,VPD=175):
// right_half() sphere(r=20);
// right_half(x=-5) sphere(r=20);
// Example(2D):
// right_half(planar=true) circle(r=20);
module right_half(s=100, x=0, planar=false)
{
dir = RIGHT;
difference() {
children();
translate([x,0,0]-dir*s/2) {
if (planar) {
square(s, center=true);
} else {
cube(s, center=true);
}
}
}
}
function right_half(p,x=0) = half_of(p, RIGHT, [x,0,0]);
// Function&Module: front_half()
// Synopsis: Masks the back half of an object along the X-Z plane, leaving the front half.
// Topics: Partitions, Masking
// See Also: back_half(), left_half(), right_half(), top_half(), bottom_half(), half_of()
//
// Usage:
// front_half([s], [y]) CHILDREN;
// front_half(planar=true, [s], [y]) CHILDREN;
// Usage: as function
// result = front_half(p, [y]);
//
// Description:
// Slices an object at a vertical X-Z cut plane, and masks away everything that is behind it.
// The s parameter is needed for the module
// version to control the size of the masking cube. If s is too large then the preview display will flip around and display the
// wrong half, but if it is too small it won't fully mask your model.
// Arguments:
// p = VNF, region or path to slice (function version)
// s = Mask size to use. Use a number larger than twice your object's largest axis. If you make this too large, OpenSCAD's preview rendering may display the wrong half. (Module version) Default: 100
// y = The Y coordinate of the cut-plane. Default: 0
// planar = If true, perform a 2D operation. (Module version) Default: false.
// Examples(FlatSpin,VPD=175):
// front_half() sphere(r=20);
// front_half(y=5) sphere(r=20);
// Example(2D):
// front_half(planar=true) circle(r=20);
module front_half(s=100, y=0, planar=false)
{
req_children($children);
dir = FWD;
difference() {
children();
translate([0,y,0]-dir*s/2) {
if (planar) {
square(s, center=true);
} else {
cube(s, center=true);
}
}
}
}
function front_half(p,y=0) = half_of(p, FRONT, [0,y,0]);
// Function&Module: back_half()
// Synopsis: Masks the front half of an object along the X-Z plane, leaving the back half.
// Topics: Partitions, Masking
// See Also: front_half(), left_half(), right_half(), top_half(), bottom_half(), half_of()
//
// Usage:
// back_half([s], [y]) CHILDREN;
// back_half(planar=true, [s], [y]) CHILDREN;
// Usage: as function
// result = back_half(p, [y]);
//
// Description:
// Slices an object at a vertical X-Z cut plane, and masks away everything that is in front of it.
// The s parameter is needed for the module
// version to control the size of the masking cube. If s is too large then the preview display will flip around and display the
// wrong half, but if it is too small it won't fully mask your model.
// Arguments:
// p = VNF, region or path to slice (function version)
// s = Mask size to use. Use a number larger than twice your object's largest axis. If you make this too large, OpenSCAD's preview rendering may display the wrong half. (Module version) Default: 100
// y = The Y coordinate of the cut-plane. Default: 0
// planar = If true, perform a 2D operation. (Module version) Default: false.
// Examples:
// back_half() sphere(r=20);
// back_half(y=8) sphere(r=20);
// Example(2D):
// back_half(planar=true) circle(r=20);
module back_half(s=100, y=0, planar=false)
{
req_children($children);
dir = BACK;
difference() {
children();
translate([0,y,0]-dir*s/2) {
if (planar) {
square(s, center=true);
} else {
cube(s, center=true);
}
}
}
}
function back_half(p,y=0) = half_of(p, BACK, [0,y,0]);
// Function&Module: bottom_half()
// Synopsis: Masks the top half of an object along the X-Y plane, leaving the bottom half.
// Topics: Partitions, Masking
// See Also: back_half(), front_half(), left_half(), right_half(), top_half(), half_of()
//
// Usage:
// bottom_half([s], [z]) CHILDREN;
// Usage: as function
// result = bottom_half(p, [z]);
//
// Description:
// Slices an object at a horizontal X-Y cut plane, and masks away everything that is above it.
// The s parameter is needed for the module
// version to control the size of the masking cube. If s is too large then the preview display will flip around and display the
// wrong half, but if it is too small it won't fully mask your model.
// Arguments:
// p = VNF, region or path to slice (function version)
// s = Mask size to use. Use a number larger than twice your object's largest axis. If you make this too large, OpenSCAD's preview rendering may display the wrong half. (Module version) Default: 100
// z = The Z coordinate of the cut-plane. Default: 0
// Examples:
// bottom_half() sphere(r=20);
// bottom_half(z=-10) sphere(r=20);
module bottom_half(s=100, z=0)
{
req_children($children);
dir = DOWN;
difference() {
children();
translate([0,0,z]-dir*s/2) {
cube(s, center=true);
}
}
}
function bottom_half(p,z=0) = half_of(p,BOTTOM,[0,0,z]);
// Function&Module: top_half()
// Synopsis: Masks the bottom half of an object along the X-Y plane, leaving the top half.
// Topics: Partitions, Masking
// See Also: back_half(), front_half(), left_half(), right_half(), bottom_half(), half_of()
//
// Usage: as module
// top_half([s], [z]) CHILDREN;
// Usage: as function
// result = top_half(p, [z]);
//
// Description:
// Slices an object at a horizontal X-Y cut plane, and masks away everything that is below it.
// The s parameter is needed for the module
// version to control the size of the masking cube. If s is too large then the preview display will flip around and display the
// wrong half, but if it is too small it won't fully mask your model.
// Arguments:
// p = VNF, region or path to slice (function version)
// s = Mask size to use. Use a number larger than twice your object's largest axis. If you make this too large, OpenSCAD's preview rendering may display the wrong half. (Module version) Default: 100
// z = The Z coordinate of the cut-plane. Default: 0
// Examples(Spin,VPD=175):
// top_half() sphere(r=20);
// top_half(z=5) sphere(r=20);
module top_half(s=100, z=0)
{
req_children($children);
dir = UP;
difference() {
children();
translate([0,0,z]-dir*s/2) {
cube(s, center=true);
}
}
}
function top_half(p,z=0) = half_of(p,UP,[0,0,z]);
// Section: Partioning into Interlocking Pieces
function _partition_subpath(type) =
type=="flat"? [[0,0],[1,0]] :
type=="sawtooth"? [[0,-0.5], [0.5,0.5], [1,-0.5]] :
type=="sinewave"? [for (a=[0:5:360]) [a/360,sin(a)/2]] :
type=="comb"? let(dx=0.5*sin(2)) [[0,0],[0+dx,0.5],[0.5-dx,0.5],[0.5+dx,-0.5],[1-dx,-0.5],[1,0]] :
type=="finger"? let(dx=0.5*sin(20)) [[0,0],[0+dx,0.5],[0.5-dx,0.5],[0.5+dx,-0.5],[1-dx,-0.5],[1,0]] :
type=="dovetail"? [[0,-0.5], [0.3,-0.5], [0.2,0.5], [0.8,0.5], [0.7,-0.5], [1,-0.5]] :
type=="hammerhead"? [[0,-0.5], [0.35,-0.5], [0.35,0], [0.15,0], [0.15,0.5], [0.85,0.5], [0.85,0], [0.65,0], [0.65,-0.5],[1,-0.5]] :
type=="jigsaw"? concat(
arc(r=5/16, cp=[0,-3/16], start=270, angle=125),
arc(r=5/16, cp=[1/2,3/16], start=215, angle=-250),
arc(r=5/16, cp=[1,-3/16], start=145, angle=125)
) :
assert(false, str("Unsupported cutpath type: ", type));
function _partition_cutpath(l, h, cutsize, cutpath, gap) =
let(
check = assert(is_finite(l))
assert(is_finite(h))
assert(is_finite(gap))
assert(is_finite(cutsize) || is_vector(cutsize,2))
assert(is_string(cutpath) || is_path(cutpath,2)),
cutsize = is_vector(cutsize)? cutsize : [cutsize*2, cutsize],
cutpath = is_path(cutpath)? cutpath :
_partition_subpath(cutpath),
reps = ceil(l/(cutsize.x+gap)),
cplen = (cutsize.x+gap) * reps,
path = deduplicate(concat(
[[-l/2, cutpath[0].y*cutsize.y]],
[for (i=[0:1:reps-1], pt=cutpath) v_mul(pt,cutsize)+[i*(cutsize.x+gap)+gap/2-cplen/2,0]],
[[ l/2, cutpath[len(cutpath)-1].y*cutsize.y]]
)),
stidxs = [for (i = idx(path)) if (path[i].x < -l/2) i],
enidxs = [for (i = idx(path)) if (path[i].x > +l/2) i],
stidx = stidxs? last(stidxs) : 0,
enidx = enidxs? enidxs[0] : -1,
trunc = select(path, stidx, enidx)
) trunc;
// Module: partition_mask()
// Synopsis: Creates a mask to remove half an object with the remaining half suitable for reassembly.
// Topics: Partitions, Masking, Paths
// See Also: partition_cut_mask(), partition()
// Usage:
// partition_mask(l, w, h, [cutsize], [cutpath], [gap], [inverse], [$slop=], [anchor=], [spin=], [orient=]) [ATTACHMENTS];
// Description:
// Creates a mask that you can use to difference or intersect with an object to remove half of it, leaving behind a side designed to allow assembly of the sub-parts.
// Arguments:
// l = The length of the cut axis.
// w = The width of the part to be masked, back from the cut plane.
// h = The height of the part to be masked.
// cutsize = The width of the cut pattern to be used.
// cutpath = The cutpath to use. Standard named paths are "flat", "sawtooth", "sinewave", "comb", "finger", "dovetail", "hammerhead", and "jigsaw". Alternatively, you can give a cutpath as a 2D path, where X is between 0 and 1, and Y is between -0.5 and 0.5.
// gap = Empty gaps between cutpath iterations. Default: 0
// inverse = If true, create a cutpath that is meant to mate to a non-inverted cutpath.
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#subsection-spin). Default: `0`
// orient = Vector to rotate top towards. See [orient](attachments.scad#subsection-orient). Default: `UP`
// $slop = The amount to shrink the mask by, to correct for printer-specific fitting.
// Examples:
// partition_mask(w=50, gap=0, cutpath="jigsaw");
// partition_mask(w=50, gap=30, cutpath="jigsaw");
// partition_mask(w=50, gap=30, cutpath="jigsaw", inverse=true);
// partition_mask(w=50, gap=30, cutsize=15, cutpath="jigsaw");
// partition_mask(w=50, cutsize=[20,20], gap=30, cutpath="jigsaw");
// Examples(2D):
// partition_mask(w=20, cutpath="sawtooth");
// partition_mask(w=20, cutpath="sinewave");
// partition_mask(w=20, cutpath="comb");
// partition_mask(w=20, cutpath="finger");
// partition_mask(w=20, cutpath="dovetail");
// partition_mask(w=20, cutpath="hammerhead");
// partition_mask(w=20, cutpath="jigsaw");
module partition_mask(l=100, w=100, h=100, cutsize=10, cutpath="jigsaw", gap=0, inverse=false, anchor=CENTER, spin=0, orient=UP)
{
cutsize = is_vector(cutsize)? point2d(cutsize) : [cutsize*2, cutsize];
path = _partition_cutpath(l, h, cutsize, cutpath, gap);
midpath = select(path,1,-2);
sizepath = concat([path[0]+[-get_slop(),0]], midpath, [last(path)+[get_slop(),0]], [[+(l/2+get_slop()), (w+get_slop())*(inverse?-1:1)], [-(l/2+get_slop()), (w+get_slop())*(inverse?-1:1)]]);
bnds = pointlist_bounds(sizepath);
fullpath = concat(path, [[last(path).x, w*(inverse?-1:1)], [path[0].x, w*(inverse?-1:1)]]);
attachable(anchor,spin,orient, size=point3d(bnds[1]-bnds[0],h)) {
linear_extrude(height=h, center=true, convexity=10) {
intersection() {
offset(delta=-get_slop()) polygon(fullpath);
square([l, w*2], center=true);
}
}
children();
}
}
// Module: partition_cut_mask()
// Synopsis: Creates a mask to cut an object into two subparts that can be reassembled.
// Topics: Partitions, Masking, Paths
// See Also: partition_mask(), partition()
// Usage:
// partition_cut_mask(l, w, h, [cutsize], [cutpath], [gap], [inverse], [$slop=], [anchor=], [spin=], [orient=]) [ATTACHMENTS];
// Description:
// Creates a mask that you can use to difference with an object to cut it into two sub-parts that can be assembled.
// The `$slop` value is important to get the proper fit and should probably be smaller than 0.2. The examples below
// use larger values to make the mask easier to see.
// Arguments:
// l = The length of the cut axis.
// w = The width of the part to be masked, back from the cut plane.
// h = The height of the part to be masked.
// cutsize = The width of the cut pattern to be used.
// cutpath = The cutpath to use. Standard named paths are "flat", "sawtooth", "sinewave", "comb", "finger", "dovetail", "hammerhead", and "jigsaw". Alternatively, you can give a cutpath as a 2D path, where X is between 0 and 1, and Y is between -0.5 and 0.5. Default: "jigsaw"
// gap = Empty gaps between cutpath iterations. Default: 0
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#subsection-spin). Default: `0`
// orient = Vector to rotate top towards. See [orient](attachments.scad#subsection-orient). Default: `UP`
// $slop = The width of the cut mask, to correct for printer-specific fitting.
// Examples:
// partition_cut_mask(gap=0, cutpath="dovetail");
// partition_cut_mask(gap=30, cutpath="dovetail");
// partition_cut_mask(gap=30, cutsize=15, cutpath="dovetail");
// partition_cut_mask(gap=30, cutsize=[20,20], cutpath="dovetail");
// Examples(2DMed):
// partition_cut_mask(cutpath="sawtooth",$slop=0.5);
// partition_cut_mask(cutpath="sinewave",$slop=0.5);
// partition_cut_mask(cutpath="comb",$slop=0.5);
// partition_cut_mask(cutpath="finger",$slop=0.5);
// partition_cut_mask(cutpath="dovetail",$slop=1);
// partition_cut_mask(cutpath="hammerhead",$slop=1);
// partition_cut_mask(cutpath="jigsaw",$slop=0.5);
module partition_cut_mask(l=100, h=100, cutsize=10, cutpath="jigsaw", gap=0, anchor=CENTER, spin=0, orient=UP)
{
cutsize = is_vector(cutsize)? cutsize : [cutsize*2, cutsize];
path = _partition_cutpath(l, h, cutsize, cutpath, gap);
attachable(anchor,spin,orient, size=[l,cutsize.y,h]) {
linear_extrude(height=h, center=true, convexity=10) {
stroke(path, width=max(0.1, get_slop()*2));
}
children();
}
}
// Module: partition()
// Synopsis: Cuts an object in two with matched joining edges, then separates the parts .
// Topics: Partitions, Masking, Paths
// See Also: partition_cut_mask(), partition_mask()
// Usage:
// partition(size, [spread], [cutsize], [cutpath], [gap], [spin], [$slop=]) CHILDREN;
// Description:
// Partitions an object into two parts, spread apart a small distance, with matched joining edges.
// Arguments:
// size = The [X,Y,Z] size of the object to partition.
// spread = The distance to spread the two parts by.
// cutsize = The width of the cut pattern to be used.
// cutpath = The cutpath to use. Standard named paths are "flat", "sawtooth", "sinewave", "comb", "finger", "dovetail", "hammerhead", and "jigsaw". Alternatively, you can give a cutpath as a 2D path, where X is between 0 and 1, and Y is between -0.5 and 0.5.
// gap = Empty gaps between cutpath iterations. Default: 0
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#subsection-spin). Default: `0`
// ---
// $slop = Extra gap to leave to correct for printer-specific fitting.
// Examples(Med):
// partition(spread=12, cutpath="dovetail") cylinder(h=50, d=80, center=false);
// partition(spread=12, gap=30, cutpath="dovetail") cylinder(h=50, d=80, center=false);
// partition(spread=20, gap=20, cutsize=15, cutpath="dovetail") cylinder(h=50, d=80, center=false);
// partition(spread=25, gap=15, cutsize=[20,20], cutpath="dovetail") cylinder(h=50, d=80, center=false);
// Examples(2DMed):
// partition(cutpath="sawtooth") cylinder(h=50, d=80, center=false);
// partition(cutpath="sinewave") cylinder(h=50, d=80, center=false);
// partition(cutpath="comb") cylinder(h=50, d=80, center=false);
// partition(cutpath="finger") cylinder(h=50, d=80, center=false);
// partition(spread=12, cutpath="dovetail") cylinder(h=50, d=80, center=false);
// partition(spread=12, cutpath="hammerhead") cylinder(h=50, d=80, center=false);
// partition(cutpath="jigsaw") cylinder(h=50, d=80, center=false);
module partition(size=100, spread=10, cutsize=10, cutpath="jigsaw", gap=0, spin=0)
{
req_children($children);
size = is_vector(size)? size : [size,size,size];
cutsize = is_vector(cutsize)? cutsize : [cutsize*2, cutsize];
rsize = v_abs(rot(spin,p=size));
vec = rot(spin,p=BACK)*spread/2;
move(vec) {
intersection() {
children();
partition_mask(l=rsize.x, w=rsize.y, h=rsize.z, cutsize=cutsize, cutpath=cutpath, gap=gap, spin=spin);
}
}
move(-vec) {
intersection() {
children();
partition_mask(l=rsize.x, w=rsize.y, h=rsize.z, cutsize=cutsize, cutpath=cutpath, gap=gap, inverse=true, spin=spin);
}
}
}
// vim: expandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap
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