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add moving fish
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Justin Lin
193
examples/moving_fish.scad
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193
examples/moving_fish.scad
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@@ -0,0 +1,193 @@
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include <hollow_out.scad>;
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include <archimedean_spiral.scad>;
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head_size = 26;
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segments = 3;
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thickness = 3;
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spacing = 0.65;
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module joint_Y(leng, width, height, ring_offset, thickness) {
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half_h = height / 2;
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half_thickness = thickness / 2;
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inner_leng = leng - thickness * 2;
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inner_width = width - thickness * 2;
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// U
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linear_extrude(height, center = true)
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difference() {
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hollow_out(thickness)
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offset(delta = thickness, chamfer = true)
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square([inner_leng, inner_width], center = true);
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translate([-half_thickness - inner_leng / 2, 0, 0])
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square([thickness, inner_width], center = true);
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}
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// ring
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r = half_h;
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offset_x = ring_offset - r / 4;
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translate([half_h + inner_leng / 2 + half_thickness, 0, 0])
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rotate([90, 0, 0])
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linear_extrude(thickness, center = true)
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difference() {
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hull() {
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translate([offset_x, 0])
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circle(r);
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translate([-r / 2, 0, 0])
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square([r, height], center = true);
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}
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translate([offset_x, 0])
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circle(r - thickness);
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}
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}
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module moving_fish(head_size, segments, thickness, spacing) {
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joint_leng = thickness * 2;
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joint_height = thickness * 2 + spacing * 2;
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joint_thickness = joint_leng / 3;
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joint_width = joint_thickness + (spacing + joint_thickness) * 2;
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ring_offset = joint_thickness / 2;
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module tri_bone(tri_side_leng) {
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double_spacing = spacing * 2;
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tri_r = tri_side_leng * 0.5773502;
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tri_r_m1 = tri_r - 1;
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half_tri_r_m1 = tri_r_m1 / 2;
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slot_leng = joint_thickness + double_spacing;
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translate([0, 0, half_tri_r_m1 + 1]) {
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translate([slot_leng, 0, joint_height / 2 - half_tri_r_m1 - 1])
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rotate([90, 0, 0])
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joint_Y(
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joint_leng,
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joint_width,
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joint_height,
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joint_thickness/ 2 ,
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joint_thickness
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);
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offset_x = (-tri_r - 1 + joint_width) / 2;
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rotate([0, -90, 0]) {
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// triangle
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linear_extrude(thickness, center = true)
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difference() {
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offset(r = 1)
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circle(tri_r_m1, $fn = 3);
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// slot
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translate([offset_x, 0, 0])
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square(
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[
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slot_leng,
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joint_height + double_spacing
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],
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center = true
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);
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}
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// stick
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translate([offset_x, 0, 0])
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rotate([90, 0, 0])
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rotate([0, 90, 0])
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linear_extrude(slot_leng, center = true)
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circle(joint_height / 2 - joint_thickness - spacing);
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}
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}
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}
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module head(tri_leng) {
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tri_leng_d2 = tri_leng / 2;
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tri_leng_d4 = tri_leng / 4;
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tri_leng_d5 = tri_leng / 5;
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module eye() {
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translate([tri_leng_d4, tri_leng_d5, tri_leng_d5])
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sphere(tri_leng / 10);
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}
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tri_r_m1 = tri_leng * 0.5773502 - 1;
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mr = tri_leng_d4 * 0.8660254;
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translate([0, 0, tri_r_m1 / 2 + 1])
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rotate([0, -90, 0]) {
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difference() {
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hull() {
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linear_extrude(thickness, center = true)
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offset(r = 1)
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circle(tri_r_m1, $fn = 3);
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translate([tri_leng / 14 * 3, 0, tri_leng_d2])
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sphere(mr);
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translate([-tri_leng_d4, 0, tri_leng_d2])
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sphere(mr);
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}
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linear_extrude(tri_leng * 1.5, center = true)
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translate([-tri_leng / 2 - tri_r_m1 / 2 - 1, 0, 0])
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square([tri_leng, tri_leng], center = true);
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translate([0, 0, tri_leng / 1.25])
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rotate([90, 0, 0])
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scale([0.75, 1, 1])
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linear_extrude(tri_leng, center = true)
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circle(tri_leng / 1.5, $fn = 3);
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}
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// eyes
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eye();
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mirror([0, 1, 0]) eye();
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}
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}
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point_distance = joint_leng + ring_offset + spacing * 3;
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arm_distance = head_size;
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init_angle = 540;
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num_of_points = segments + 2;
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points_angles = archimedean_spiral(
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arm_distance = arm_distance,
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init_angle = init_angle,
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point_distance = point_distance,
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num_of_points = num_of_points
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);
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side_leng_step = 0.45 * head_size / segments;
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// head
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rotate(init_angle)
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translate(-points_angles[0][0])
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rotate(90) {
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tri_bone(head_size);
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head(head_size);
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}
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// body
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leng_pts = len(points_angles);
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for(i = [1: leng_pts - 2]) {
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translate(points_angles[i][0])
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rotate(points_angles[i][1] + 90)
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tri_bone(head_size - side_leng_step * i);
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}
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tail_r = head_size / 3;
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// tail
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translate(points_angles[leng_pts - 1][0])
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linear_extrude(joint_height)
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rotate(90 + points_angles[leng_pts - 2][1])
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translate([tail_r / 2, 0, 0]) {
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difference() {
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circle(tail_r);
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translate([tail_r * 0.75, 0, 0])
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circle(tail_r);
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}
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hollow_out(thickness / 2.4)
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circle(3 * thickness / 2.4);
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}
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}
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moving_fish(head_size, segments, thickness, spacing, $fn = 24);
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