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vnf_debug update

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path self intersection speedup
This commit is contained in:
Adrian Mariano 2021-10-03 22:37:57 -04:00
parent 2a64c89b8f
commit d986db2e1e
2 changed files with 120 additions and 131 deletions
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47
paths.scad
View File

@ -210,36 +210,31 @@ function path_length_fractions(path, closed=false) =
/// for (isect=isects) translate(isect[0]) color("blue") sphere(d=10);
function _path_self_intersections(path, closed=true, eps=EPSILON) =
let(
path = cleanup_path(path, eps=eps),
path = closed ? close_path(path,eps=eps) : path,
plen = len(path)
)
[
for (i = [0:1:plen-(closed?2:3)])
let(
a1 = path[i],
a2 = path[(i+1)%plen],
maxax = max(a1.x,a2.x),
minax = min(a1.x,a2.x),
maxay = max(a1.y,a2.y),
minay = min(a1.y,a2.y)
)
for(j=[i+2:1:plen-(closed?1:2)])
[ for (i = [0:1:plen-3]) let(
a1 = path[i],
a2 = path[i+1],
// The sign of signals is positive if the segment is one one side of
// the line defined by [a1,a2] and negative on the other side.
seg_normal = unit([-(a2-a1).y, (a2-a1).x]),
signals = [for(j=[i+2:1:plen-(i==0 && closed? 2: 1)]) path[j]-a1 ]*seg_normal
)
for(j=[i+2:1:plen-(i==0 && closed? 3: 2)])
// The signals test requires the two signals to have different signs,
// otherwise b1 and b2 are on the same side of the line defined by [a1,a2]
// and hence intersection is impossible
if( signals[j-i-2]*signals[j-i-1] <= 0 )
let(
b1 = path[j],
b2 = path[(j+1)%plen],
isect =
maxax < b1.x && maxax < b2.x ||
minax > b1.x && minax > b2.x ||
maxay < b1.y && maxay < b2.y ||
minay > b1.y && minay > b2.y
? undef
: _general_line_intersection([a1,a2],[b1,b2])
b2 = path[j+1]
)
if ((!closed || i!=0 || j!=plen-1)
&& isect != undef
&& isect[1]>=-eps && isect[1]<=1+eps
&& isect[2]>=-eps && isect[2]<=1+eps)
[isect[0], i, isect[1], j, isect[2]]
// This test checks that a1 and a2 are on opposite sides of the
// line defined by [b1,b2].
if( cross(b2-b1, a1-b1)*cross(b2-b1, a2-b1) <= 0 )
let(isect = _general_line_intersection([a1,a2],[b1,b2],eps=eps))
if (isect) [isect[0], i, isect[1], j, isect[2]]
];
@ -266,7 +261,7 @@ function _sum_preserving_round(data, index=0) =
// Function: subdivide_path()
// Usage:
// newpath = subdivide_path(path, [N|refine], method);
// newpath = subdivide_path(path, [N|refine], method, [closed], [exact]);
// Description:
// Takes a path as input (closed or open) and subdivides the path to produce a more
// finely sampled path. The new points can be distributed proportional to length

204
vnf.scad
View File

@ -486,33 +486,34 @@ module vnf_polyhedron(vnf, convexity=2, extent=true, cp=[0,0,0], anchor="origin"
// Usage:
// vnf_wireframe(vnf, <r|d>);
// Description:
// Given a VNF, creates a wire frame ball-and-stick model of the polyhedron with a cylinder for each edge and a sphere at each vertex.
// Given a VNF, creates a wire frame ball-and-stick model of the polyhedron with a cylinder for
// each edge and a sphere at each vertex. The width parameter specifies the width of the sticks
// that form the wire frame.
// Arguments:
// vnf = A vnf structure
// r|d = radius or diameter of the cylinders forming the wire frame. Default: r=1
// width = width of the cylinders forming the wire frame. Default: 1
// Example:
// $fn=32;
// ball = sphere(r=20, $fn=6);
// vnf_wireframe(ball,d=1);
// vnf_wireframe(ball,width=1);
// Example:
// include<BOSL2/polyhedra.scad>
// $fn=32;
// cube_oct = regular_polyhedron_info("vnf", name="cuboctahedron", or=20);
// vnf_wireframe(cube_oct);
// include <BOSL2/polyhedra.scad>
// $fn=32;
// cube_oct = regular_polyhedron_info("vnf", name="cuboctahedron", or=20);
// vnf_wireframe(cube_oct);
// Example: The spheres at the vertex are imperfect at aligning with the cylinders, so especially at low $fn things look prety ugly. This is normal.
// include<BOSL2/polyhedra.scad>
// $fn=8;
// octahedron = regular_polyhedron_info("vnf", name="octahedron", or=20);
// vnf_wireframe(octahedron,r=5);
module vnf_wireframe(vnf, r, d)
// include <BOSL2/polyhedra.scad>
// $fn=8;
// octahedron = regular_polyhedron_info("vnf", name="octahedron", or=20);
// vnf_wireframe(octahedron,width=5);
module vnf_wireframe(vnf, width=1)
{
r = get_radius(r=r,d=d,dflt=1);
vertex = vnf[0];
edges = unique([for (face=vnf[1], i=idx(face))
sort([face[i], select(face,i+1)])
]);
for (e=edges) extrude_from_to(vertex[e[0]],vertex[e[1]]) circle(r=r);
move_copies(vertex) sphere(r=r);
for (e=edges) extrude_from_to(vertex[e[0]],vertex[e[1]]) circle(d=width);
move_copies(vertex) sphere(d=width);
}
@ -931,9 +932,9 @@ function _split_polygons_at_each_y(polys, ys, _i=0) =
// Section: Debugging Polyhedrons
// Module: debug_vertices()
// Module: _show_vertices()
// Usage:
// debug_vertices(vertices, [size], [disabled=]);
// _show_vertices(vertices, [size], [disabled=]);
// Description:
// Draws all the vertices in an array, at their 3D position, numbered by their
// position in the vertex array. Also draws any children of this module with
@ -946,87 +947,75 @@ function _split_polygons_at_each_y(polys, ys, _i=0) =
// Example:
// verts = [for (z=[-10,10], y=[-10,10], x=[-10,10]) [x,y,z]];
// faces = [[0,1,2], [1,3,2], [0,4,5], [0,5,1], [1,5,7], [1,7,3], [3,7,6], [3,6,2], [2,6,4], [2,4,0], [4,6,7], [4,7,5]];
// debug_vertices(vertices=verts, size=2) {
// _show_vertices(vertices=verts, size=2) {
// polyhedron(points=verts, faces=faces);
// }
module debug_vertices(vertices, size=1, disabled=false) {
if (!disabled) {
color("blue") {
dups = vector_search(vertices, EPSILON, vertices);
for (ind = dups){
numstr = str_join([for(i=ind) str(i)],",");
v = vertices[ind[0]];
translate(v) {
up(size/8) zrot($vpr[2]) xrot(90) {
linear_extrude(height=size/10, center=true, convexity=10) {
text(text=numstr, size=size, halign="center");
}
}
sphere(size/10);
module _show_vertices(vertices, size=1) {
color("blue") {
dups = vector_search(vertices, EPSILON, vertices);
for (ind = dups){
numstr = str_join([for(i=ind) str(i)],",");
v = vertices[ind[0]];
translate(v) {
rot($vpr) back(size/8){
linear_extrude(height=size/10, center=true, convexity=10) {
text(text=numstr, size=size, halign="center");
}
}
sphere(size/10);
}
}
}
if ($children > 0) {
if (!disabled) {
color([0.2, 1.0, 0, 0.5]) children();
} else {
children();
}
}
}
// Module: debug_faces()
// Usage:
// debug_faces(vertices, faces, [size=], [disabled=]);
// Description:
// Draws all the vertices at their 3D position, numbered in blue by their
// position in the vertex array. Each face will have their face number drawn
// in red, aligned with the center of face. All children of this module are drawn
// with transparency.
// Arguments:
// vertices = Array of point vertices.
// faces = Array of faces by vertex numbers.
// ---
// size = The size of the text used to label the faces and vertices. Default: 1
// disabled = If true, don't draw numbers, and draw children without transparency. Default: false.
// Example(EdgesMed):
// verts = [for (z=[-10,10], y=[-10,10], x=[-10,10]) [x,y,z]];
// faces = [[0,1,2], [1,3,2], [0,4,5], [0,5,1], [1,5,7], [1,7,3], [3,7,6], [3,6,2], [2,6,4], [2,4,0], [4,6,7], [4,7,5]];
// debug_faces(vertices=verts, faces=faces, size=2) {
// polyhedron(points=verts, faces=faces);
// }
module debug_faces(vertices, faces, size=1, disabled=false) {
if (!disabled) {
vlen = len(vertices);
color("red") {
for (i = [0:1:len(faces)-1]) {
face = faces[i];
if (face[0] < 0 || face[1] < 0 || face[2] < 0 || face[0] >= vlen || face[1] >= vlen || face[2] >= vlen) {
echo("BAD FACE: ", vlen=vlen, face=face);
} else {
verts = select(vertices,face);
c = mean(verts);
v0 = verts[0];
v1 = verts[1];
v2 = verts[2];
dv0 = unit(v1 - v0);
dv1 = unit(v2 - v0);
nrm0 = cross(dv0, dv1);
nrm1 = UP;
axis = vector_axis(nrm0, nrm1);
ang = vector_angle(nrm0, nrm1);
theta = atan2(nrm0[1], nrm0[0]);
translate(c) {
rotate(a=180-ang, v=axis) {
zrot(theta-90)
linear_extrude(height=size/10, center=true, convexity=10) {
union() {
text(text=str(i), size=size, halign="center");
text(text=str("_"), size=size, halign="center");
}
/// Module: _show_faces()
/// Usage:
/// _show_faces(vertices, faces, [size=], [disabled=]);
/// Description:
/// Draws all the vertices at their 3D position, numbered in blue by their
/// position in the vertex array. Each face will have their face number drawn
/// in red, aligned with the center of face. All children of this module are drawn
/// with transparency.
/// Arguments:
/// vertices = Array of point vertices.
/// faces = Array of faces by vertex numbers.
/// ---
/// size = The size of the text used to label the faces and vertices. Default: 1
/// disabled = If true, don't draw numbers, and draw children without transparency. Default: false.
/// Example(EdgesMed):
/// verts = [for (z=[-10,10], y=[-10,10], x=[-10,10]) [x,y,z]];
/// faces = [[0,1,2], [1,3,2], [0,4,5], [0,5,1], [1,5,7], [1,7,3], [3,7,6], [3,6,2], [2,6,4], [2,4,0], [4,6,7], [4,7,5]];
/// _show_faces(vertices=verts, faces=faces, size=2) {
/// polyhedron(points=verts, faces=faces);
/// }
module _show_faces(vertices, faces, size=1) {
vlen = len(vertices);
color("red") {
for (i = [0:1:len(faces)-1]) {
face = faces[i];
if (face[0] < 0 || face[1] < 0 || face[2] < 0 || face[0] >= vlen || face[1] >= vlen || face[2] >= vlen) {
echo("BAD FACE: ", vlen=vlen, face=face);
} else {
verts = select(vertices,face);
c = mean(verts);
v0 = verts[0];
v1 = verts[1];
v2 = verts[2];
dv0 = unit(v1 - v0);
dv1 = unit(v2 - v0);
nrm0 = cross(dv0, dv1);
nrm1 = UP;
axis = vector_axis(nrm0, nrm1);
ang = vector_angle(nrm0, nrm1);
theta = atan2(nrm0[1], nrm0[0]);
translate(c) {
rotate(a=180-ang, v=axis) {
zrot(theta-90)
linear_extrude(height=size/10, center=true, convexity=10) {
union() {
text(text=str(i), size=size, halign="center");
text(text=str("_"), size=size, halign="center");
}
}
}
@ -1034,44 +1023,49 @@ module debug_faces(vertices, faces, size=1, disabled=false) {
}
}
}
debug_vertices(vertices, size=size, disabled=disabled) {
children();
}
if (!disabled) {
echo(faces=faces);
}
}
// Module: debug_vnf()
// Module: vnf_debug()
// Usage:
// debug_vnf(vnfs, [convexity=], [txtsize=], [disabled=]);
// vnf_debug(vnfs, [faces=], [vertices=], [convexity=], [txtsize=]);
// Description:
// A drop-in module to replace `vnf_polyhedron()` and help debug vertices and faces.
// A drop-in module to replace `vnf_polyhedron()` to help debug vertices and faces.
// Draws all the vertices at their 3D position, numbered in blue by their
// position in the vertex array. Each face will have its face number drawn
// in red, aligned with the center of face. All given faces are drawn with
// transparency. All children of this module are drawn with transparency.
// Works best with Thrown-Together preview mode, to see reversed faces.
// You can set opacity to 0 if you want to disable the display of the polyhedron faces.
// .
// The vertex numbers are shown rotated to face you. As you rotate your polyhedron you
// can rerun the preview to display them oriented for viewing from a different viewpoint.
// Topics: Polyhedra, Debugging
// Arguments:
// vnf = vnf to display
// ---
// faces = if true display face numbers. Default: true
// vertices = if true display vertex numbers. Default: true
// opacity = Opacity of the polyhedron faces. Default: 0.5
// convexity = The max number of walls a ray can pass through the given polygon paths.
// txtsize = The size of the text used to label the faces and vertices.
// size = The size of the text used to label the faces and vertices. Default: 1
// disabled = If true, act exactly like `polyhedron()`. Default = false.
// Example(EdgesMed):
// verts = [for (z=[-10,10], a=[0:120:359.9]) [10*cos(a),10*sin(a),z]];
// faces = [[0,1,2], [5,4,3], [0,3,4], [0,4,1], [1,4,5], [1,5,2], [2,5,3], [2,3,0]];
// debug_vnf([verts,faces], txtsize=2);
module debug_vnf(vnf, convexity=6, txtsize=1, disabled=false) {
debug_faces(vertices=vnf[0], faces=vnf[1], size=txtsize, disabled=disabled) {
vnf_polyhedron(vnf, convexity=convexity);
}
// vnf_debug([verts,faces], txtsize=2);
module vnf_debug(vnf, convexity=6, size=1, faces=true, vertices=true, opacity=0.5) {
no_children($children);
if (faces)
_show_faces(vertices=vnf[0], faces=vnf[1], size=size);
if (vertices)
_show_vertices(vertices=vnf[0], size=size);
color([0.2, 1.0, 0, opacity])
vnf_polyhedron(vnf,convexity=convexity);
}
// Function&Module: vnf_validate()
// Usage: As Function
// fails = vnf_validate(vnf);