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[WIP] add additional ear shaping methods

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v2: semi-circle remapped polyhedron

v3: bezier curve polyhedron
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djerun 2025-06-15 16:19:36 +02:00
commit 05f2758275
1 changed files with 114 additions and 7 deletions
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121
catear_headband.scad
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@ -1,9 +1,58 @@
include <globals.scad>;
include <primitives.scad>;
use <headband.scad>;
use <chamfer.scad>;
module catear(height, thickness, fractal=0, side_len=30, bend_factor=0.5, stretch_factor=1.2, debug=false, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE, details=true, end_caps=true) {
/**
* unsupported parameters: chamfer, chamfer_shape, details, end_caps
*/
module catear_v3(height, thickness, fractal=0, side_len=30, bend_factor=0.15, stretch_factor=1.2, debug=false, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE, details=true, end_caps=true, skew=2.0) {
S = side_len;
s = S/2;
sf = stretch_factor;
bf = bend_factor;
mn = 1.16; // magic number
f=skew*S*0.2;
a = skew*10;
R = [[cos(a), -sin(a), 0],
[sin(a), cos(a), 0],
[ 0, 0, 1]];
A = [ s , 0, 0];
B = [ S*bf, S*sf*mn, 0] * R;
C = [-S*bf, S*sf*mn, 0] * R;
D = [-s , 0, 0];
if (debug) translate([0, 0, height]) rotate(90) bezier_curve_debug([A, B, C, D]);
}
/**
* unsupported parameters: debug, chamfer, chamfer_shape, details, end_caps
*/
module catear_v2(height, thickness, fractal=0, side_len=30, bend_factor=0.15, stretch_factor=1.2, debug=false, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE, details=true, end_caps=true, skew=2.0) {
r=side_len/2;
T=side_len+thickness;
S=side_len-thickness;
x_stretch = function (x) pow(x, abs(skew));
y_stretch = function (y) pow(y, 2.0);
E=1.6*stretch_factor;
a=y_stretch(r)+thickness/2;
b=y_stretch(r)-thickness/2;
e=(E*a-thickness)/b;
echo("E",E,"e",e, "a", a, "b", b, "c", thickness);
outer_remap = function (p) [scalc(x_stretch, p.x, T/2, -T/2)*sign(skew), scalc(y_stretch, p.y, 0, T/2)*E, p.z];
inner_remap = function (p) [scalc(x_stretch, p.x, S/2, -S/2)*sign(skew), scalc(y_stretch, p.y, 0, T/2)*e, p.z];
or = function (p) [p.x, 2*p.y, p.z];
arc(0.5, r, thickness, height, outer_remap=outer_remap, inner_remap=inner_remap);
}
/**
* unsupported parameters: skew
*/
module catear_v1(height, thickness, fractal=0, side_len=30, bend_factor=0.15, stretch_factor=1.2, debug=false, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE, details=true, end_caps=true, skew=2.0) {
$A=[0, side_len/2];
$B=[0,-side_len/2];
$C=[-(side_len/2/sin(120))*1.5*stretch_factor, 0];
@ -76,7 +125,7 @@ module catear(height, thickness, fractal=0, side_len=30, bend_factor=0.5, stretc
}
}
module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, ear_scale=1.5, ear_bend_factor=0.15, ear_stretch_factor=1.2, ear_angle=42, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE, with_rake=true, details=true) {
module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, ear_scale=1.5, ear_bend_factor=0.15, ear_stretch_factor=1.2, ear_angle=42, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE, with_rake=true, details=true, ear_skew=2.0) {
$a=size/2*ear_scale;
$delta=2*(acos($a/(size*2))-90);
@ -84,7 +133,7 @@ module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNES
union() {
rotate( ear_angle, [0, 0, 1]) {
translate([-ear_offset, 0, 0]) catear(
translate([-ear_offset, 0, 0]) catear_v3(
debug=debug,
height=height,
thickness=thickness,
@ -93,11 +142,40 @@ module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNES
stretch_factor=ear_stretch_factor,
chamfer=chamfer,
chamfer_shape=chamfer_shape,
details=details
details=details,
skew=ear_skew
);
}
rotate( ear_angle, [0, 0, 1]) {
translate([-ear_offset, 0, -2*height]) catear_v2(
debug=debug,
height=height,
thickness=thickness,
side_len=size/2*ear_scale,
bend_factor=ear_bend_factor,
stretch_factor=ear_stretch_factor,
chamfer=chamfer,
chamfer_shape=chamfer_shape,
details=details,
skew=ear_skew
);
}
rotate( ear_angle, [0, 0, 1]) {
translate([-ear_offset, 0, -height]) catear_v1(
debug=debug,
height=height,
thickness=thickness,
side_len=size/2*ear_scale,
bend_factor=ear_bend_factor,
stretch_factor=ear_stretch_factor,
chamfer=chamfer,
chamfer_shape=chamfer_shape,
details=details,
skew=ear_skew
);
}
rotate(-ear_angle, [0, 0, 1]) {
translate([-ear_offset, 0, 0]) catear(
translate([-ear_offset, 0, 0]) catear_v3(
debug=false,
height=height,
thickness=thickness,
@ -106,7 +184,36 @@ module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNES
stretch_factor=ear_stretch_factor,
chamfer=chamfer,
chamfer_shape=chamfer_shape,
details=details
details=details,
skew=-ear_skew
);
}
rotate(-ear_angle, [0, 0, 1]) {
translate([-ear_offset, 0, -2*height]) catear_v2(
debug=false,
height=height,
thickness=thickness,
side_len=size/2*ear_scale,
bend_factor=ear_bend_factor,
stretch_factor=ear_stretch_factor,
chamfer=chamfer,
chamfer_shape=chamfer_shape,
details=details,
skew=-ear_skew
);
}
rotate(-ear_angle, [0, 0, 1]) {
translate([-ear_offset, 0, -height]) catear_v1(
debug=false,
height=height,
thickness=thickness,
side_len=size/2*ear_scale,
bend_factor=ear_bend_factor,
stretch_factor=ear_stretch_factor,
chamfer=chamfer,
chamfer_shape=chamfer_shape,
details=details,
skew=-ear_skew
);
}
headband(
@ -123,4 +230,4 @@ module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNES
};
}
catear_headband();
rotate(-90) catear_headband(ear_bend_factor=0.15, ear_skew=2, debug=true);