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Experimental CGAL based code for curved text extrusion

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This commit is contained in:
Vojtech Bubnik 2022-03-09 10:43:19 +01:00
parent df9220e5a8
commit 6959fa6392
3 changed files with 1317 additions and 1 deletions
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tests/libslic3r/test_emboss-backup.cpp Normal file
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#include <catch2/catch.hpp>
#include <libslic3r/Emboss.hpp>
#include <libslic3r/SVG.hpp> // only debug visualization
#include <optional>
#include <libslic3r/AABBTreeIndirect.hpp>
#include <libslic3r/Utils.hpp> // for next_highest_power_of_2()
using namespace Slic3r;
namespace Private{
// calculate multiplication of ray dir to intersect - inspired by
// segment_segment_intersection when ray dir is normalized retur distance from
// ray point to intersection No value mean no intersection
std::optional<double> ray_segment_intersection(const Vec2d &r_point,
const Vec2d &r_dir,
const Vec2d &s0,
const Vec2d &s1)
{
auto denominate = [](const Vec2d &v0, const Vec2d &v1) -> double {
return v0.x() * v1.y() - v1.x() * v0.y();
};
Vec2d segment_dir = s1 - s0;
double d = denominate(segment_dir, r_dir);
if (std::abs(d) < std::numeric_limits<double>::epsilon())
// Line and ray are collinear.
return {};
Vec2d s12 = s0 - r_point;
double s_number = denominate(r_dir, s12);
bool change_sign = false;
if (d < 0.) {
change_sign = true;
d = -d;
s_number = -s_number;
}
if (s_number < 0. || s_number > d)
// Intersection outside of segment.
return {};
double r_number = denominate(segment_dir, s12);
if (change_sign) r_number = -r_number;
if (r_number < 0.)
// Intersection before ray start.
return {};
return r_number / d;
}
Vec2d get_intersection(const Vec2d & point,
const Vec2d & dir,
const std::array<Vec2d, 3> &triangle)
{
std::optional<double> t;
for (size_t i = 0; i < 3; ++i) {
size_t i2 = i + 1;
if (i2 == 3) i2 = 0;
if (!t.has_value()) {
t = ray_segment_intersection(point, dir, triangle[i],
triangle[i2]);
continue;
}
// small distance could be preccission inconsistance
std::optional<double> t2 = ray_segment_intersection(point, dir,
triangle[i],
triangle[i2]);
if (t2.has_value() && *t2 > *t) t = t2;
}
assert(t.has_value()); // Not found intersection.
return point + dir * (*t);
}
Vec3d calc_hit_point(const igl::Hit & h,
const Vec3i & triangle,
const std::vector<Vec3f> &vertices)
{
double c1 = h.u;
double c2 = h.v;
double c0 = 1.0 - c1 - c2;
Vec3d v0 = vertices[triangle[0]].cast<double>();
Vec3d v1 = vertices[triangle[1]].cast<double>();
Vec3d v2 = vertices[triangle[2]].cast<double>();
return v0 * c0 + v1 * c1 + v2 * c2;
}
Vec3d calc_hit_point(const igl::Hit &h, indexed_triangle_set &its)
{
return calc_hit_point(h, its.indices[h.id], its.vertices);
}
} // namespace Private
#include "imgui/imstb_truetype.h"
TEST_CASE("Emboss text - Times MacOs", "[Emboss]") {
std::string font_path = "C:/Users/filip/Downloads/Times.ttc";
//std::string font_path = "//System/Library/Fonts/Times.ttc";
char letter = 'C';
float flatness = 2.;
FILE *file = fopen(font_path.c_str(), "rb");
REQUIRE(file != nullptr);
// find size of file
REQUIRE(fseek(file, 0L, SEEK_END) == 0);
size_t size = ftell(file);
REQUIRE(size != 0);
rewind(file);
std::vector<unsigned char> buffer(size);
size_t count_loaded_bytes = fread((void *) &buffer.front(), 1, size, file);
REQUIRE(count_loaded_bytes == size);
int font_offset = stbtt_GetFontOffsetForIndex(buffer.data(), 0);
REQUIRE(font_offset >= 0);
stbtt_fontinfo font_info;
REQUIRE(stbtt_InitFont(&font_info, buffer.data(), font_offset) != 0);
int unicode_letter = (int) letter;
int glyph_index = stbtt_FindGlyphIndex(&font_info, unicode_letter);
REQUIRE(glyph_index != 0);
stbtt_vertex *vertices;
int num_verts = stbtt_GetGlyphShape(&font_info, glyph_index, &vertices);
CHECK(num_verts > 0);
}
#include <libslic3r/Utils.hpp>
TEST_CASE("Emboss text", "[Emboss]")
{
std::string font_path = std::string(TEST_DATA_DIR) + "/fonts/NotoSans-Regular.ttf";
char letter = '%';
float flatness = 2.;
auto font = Emboss::load_font(font_path.c_str());
REQUIRE(font != nullptr);
std::optional<Emboss::Glyph> glyph = Emboss::letter2glyph(*font, letter, flatness);
REQUIRE(glyph.has_value());
ExPolygons shape = glyph->shape;
REQUIRE(!shape.empty());
float z_depth = 1.f;
Emboss::ProjectZ projection(z_depth);
indexed_triangle_set its = Emboss::polygons2model(shape, projection);
CHECK(!its.indices.empty());
}
TEST_CASE("Test hit point", "[AABBTreeIndirect]")
{
indexed_triangle_set its;
its.vertices = {
Vec3f(1, 1, 1),
Vec3f(2, 10, 2),
Vec3f(10, 0, 2),
};
its.indices = {Vec3i(0, 2, 1)};
auto tree = AABBTreeIndirect::build_aabb_tree_over_indexed_triangle_set(
its.vertices, its.indices);
Vec3d ray_point(8, 1, 0);
Vec3d ray_dir(0, 0, 1);
igl::Hit hit;
AABBTreeIndirect::intersect_ray_first_hit(its.vertices, its.indices, tree,
ray_point, ray_dir, hit);
Vec3d hp = Private::calc_hit_point(hit, its);
CHECK(abs(hp.x() - ray_point.x()) < .1);
CHECK(abs(hp.y() - ray_point.y()) < .1);
}
TEST_CASE("ray segment intersection", "[MeshBoolean]")
{
Vec2d r_point(1, 1);
Vec2d r_dir(1, 0);
// colinear
CHECK(!Private::ray_segment_intersection(r_point, r_dir, Vec2d(0, 0), Vec2d(2, 0)).has_value());
CHECK(!Private::ray_segment_intersection(r_point, r_dir, Vec2d(2, 0), Vec2d(0, 0)).has_value());
// before ray
CHECK(!Private::ray_segment_intersection(r_point, r_dir, Vec2d(0, 0), Vec2d(0, 2)).has_value());
CHECK(!Private::ray_segment_intersection(r_point, r_dir, Vec2d(0, 2), Vec2d(0, 0)).has_value());
// above ray
CHECK(!Private::ray_segment_intersection(r_point, r_dir, Vec2d(2, 2), Vec2d(2, 3)).has_value());
CHECK(!Private::ray_segment_intersection(r_point, r_dir, Vec2d(2, 3), Vec2d(2, 2)).has_value());
// belove ray
CHECK(!Private::ray_segment_intersection(r_point, r_dir, Vec2d(2, 0), Vec2d(2, -1)).has_value());
CHECK(!Private::ray_segment_intersection(r_point, r_dir, Vec2d(2, -1), Vec2d(2, 0)).has_value());
// intersection at [2,1] distance 1
auto t1 = Private::ray_segment_intersection(r_point, r_dir, Vec2d(2, 0), Vec2d(2, 2));
REQUIRE(t1.has_value());
auto t2 = Private::ray_segment_intersection(r_point, r_dir, Vec2d(2, 2), Vec2d(2, 0));
REQUIRE(t2.has_value());
CHECK(abs(*t1 - *t2) < std::numeric_limits<double>::epsilon());
}
TEST_CASE("triangle intersection", "[]")
{
Vec2d point(1, 1);
Vec2d dir(-1, 0);
std::array<Vec2d, 3> triangle = {Vec2d(0, 0), Vec2d(5, 0), Vec2d(0, 5)};
Vec2d i = Private::get_intersection(point, dir, triangle);
CHECK(abs(i.x()) < std::numeric_limits<double>::epsilon());
CHECK(abs(i.y() - 1.) < std::numeric_limits<double>::epsilon());
}
#ifndef __APPLE__
#include <string>
#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
TEST_CASE("Italic check", "[]")
{
std::queue<std::string> dir_paths;
#ifdef _WIN32
dir_paths.push("C:/Windows/Fonts");
#elif defined(__linux__)
dir_paths.push("/usr/share/fonts");
#endif
bool exist_italic = false;
bool exist_non_italic = false;
while (!dir_paths.empty()) {
std::string dir_path = dir_paths.front();
dir_paths.pop();
for (const auto &entry : fs::directory_iterator(dir_path)) {
const fs::path &act_path = entry.path();
if (entry.is_directory()) {
dir_paths.push(act_path.u8string());
continue;
}
std::string ext = act_path.extension().u8string();
std::transform(ext.begin(), ext.end(), ext.begin(),
[](unsigned char c) { return std::tolower(c); });
if (ext != ".ttf") continue;
std::string path_str = act_path.u8string();
auto font_opt = Emboss::load_font(path_str.c_str());
if (font_opt == nullptr) continue;
if (Emboss::is_italic(*font_opt))
exist_italic = true;
else
exist_non_italic = true;
//std::cout << ((Emboss::is_italic(*font_opt)) ? "[yes] " : "[no ] ") << entry.path() << std::endl;
}
}
CHECK(exist_italic);
CHECK(exist_non_italic);
}
#endif // not __APPLE__
#include <CGAL/Polygon_mesh_processing/corefinement.h>
#include <CGAL/Exact_integer.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Cartesian_converter.h>
struct GlyphID
{
int32_t glyph { -1 };
int32_t expoly { -1 };
int32_t contour { -1 };
// vertex or edge ID, where edge ID is the index of the source point.
int32_t idx { -1 };
GlyphID& operator++() { ++idx; return *this; }
};
namespace Slic3r::MeshBoolean::cgal2 {
namespace CGALProc = CGAL::Polygon_mesh_processing;
namespace CGALParams = CGAL::Polygon_mesh_processing::parameters;
using EpecKernel = CGAL::Exact_predicates_exact_constructions_kernel;
using EpicKernel = CGAL::Exact_predicates_inexact_constructions_kernel;
using _EpicMesh = CGAL::Surface_mesh<EpicKernel::Point_3>;
using _EpecMesh = CGAL::Surface_mesh<EpecKernel::Point_3>;
using CGALMesh = _EpicMesh;
void triangle_mesh_to_cgal(const std::vector<stl_vertex>& V,
const std::vector<stl_triangle_vertex_indices>& F,
CGALMesh& out,
CGALMesh::Property_map<CGAL::SM_Face_index, int32_t> object_face_source_id)
{
if (F.empty()) return;
size_t vertices_count = V.size();
size_t edges_count = (F.size() * 3) / 2;
size_t faces_count = F.size();
out.reserve(vertices_count, edges_count, faces_count);
for (auto& v : V)
out.add_vertex(typename CGALMesh::Point{ v.x(), v.y(), v.z() });
using VI = typename CGALMesh::Vertex_index;
for (auto& f : F) {
auto fid = out.add_face(VI(f(0)), VI(f(1)), VI(f(2)));
object_face_source_id[fid] = int32_t(&f - &F.front());
}
}
void glyph2model(
const ExPolygons& glyph,
int32_t glyph_id,
const Slic3r::Emboss::IProject& projection,
CGALMesh& out,
typename CGALMesh::Property_map<CGAL::SM_Edge_index, GlyphID> &glyph_id_edge,
typename CGALMesh::Property_map<CGAL::SM_Face_index, GlyphID> &glyph_id_face)
{
std::vector<CGALMesh::Vertex_index> indices;
auto insert_contour = [&projection, &indices , &out, glyph_id, &glyph_id_edge, &glyph_id_face](const Polygon& polygon, int32_t iexpoly, int32_t id) {
indices.clear();
indices.reserve(polygon.points.size() * 2);
for (const Point& p2 : polygon.points) {
auto p = projection.project(p2);
indices.emplace_back(out.add_vertex(typename CGALMesh::Point{ p.first.x(), p.first.y(), p.first.z() }));
indices.emplace_back(out.add_vertex(typename CGALMesh::Point{ p.second.x(), p.second.y(), p.second.z() }));
}
for (int32_t i = 0; i < int32_t(indices.size()); i += 2) {
int32_t j = (i + 2) % int32_t(indices.size());
auto find_edge = [&out](CGALMesh::Face_index fi, CGALMesh::Vertex_index from, CGALMesh::Vertex_index to) {
CGALMesh::Halfedge_index hi = out.halfedge(fi);
for (; out.target(hi) != to; hi = out.next(hi));
assert(out.source(hi) == from);
assert(out.target(hi) == to);
return hi;
};
auto fi = out.add_face(indices[i], indices[i + 1], indices[j]);
GlyphID glid { glyph_id, iexpoly, id, i * 2 };
glyph_id_edge[out.edge(find_edge(fi, indices[i], indices[i + 1]))] = glid;
glyph_id_face[fi] = ++ glid;
glyph_id_edge[out.edge(find_edge(fi, indices[i + 1], indices[j]))] = ++ glid;
glyph_id_face[out.add_face(indices[j], indices[i + 1], indices[j + 1])] = ++ glid;
}
};
size_t count_point = count_points(glyph);
out.reserve(out.number_of_vertices() + 2 * count_point, out.number_of_edges() + 4 * count_point, out.number_of_faces() + 2 * count_point);
for (const ExPolygon &expolygon : glyph) {
int32_t idx_contour = &expolygon - &glyph.front();
insert_contour(expolygon.contour, idx_contour, 0);
for (const Polygon& hole : expolygon.holes)
insert_contour(hole, idx_contour, 1 + (&hole - &expolygon.holes.front()));
}
}
}
bool its_write_obj(const indexed_triangle_set& its, const std::vector<Vec3f> &color, const char* file)
{
Slic3r::CNumericLocalesSetter locales_setter;
FILE* fp = fopen(file, "w");
if (fp == nullptr) {
return false;
}
for (size_t i = 0; i < its.vertices.size(); ++i)
fprintf(fp, "v %f %f %f %f %f %f\n",
its.vertices[i](0), its.vertices[i](1), its.vertices[i](2),
color[i](0), color[i](1), color[i](2));
for (size_t i = 0; i < its.indices.size(); ++i)
fprintf(fp, "f %d %d %d\n", its.indices[i][0] + 1, its.indices[i][1] + 1, its.indices[i][2] + 1);
fclose(fp);
return true;
}
TEST_CASE("Emboss extrude cut", "[Emboss-Cut]")
{
std::string font_path = std::string(TEST_DATA_DIR) + "/fonts/NotoSans-Regular.ttf";
char letter = '%';
float flatness = 2.;
auto font = Emboss::load_font(font_path.c_str());
REQUIRE(font != nullptr);
std::optional<Emboss::Glyph> glyph = Emboss::letter2glyph(*font, letter, flatness);
REQUIRE(glyph.has_value());
ExPolygons shape = glyph->shape;
REQUIRE(!shape.empty());
float z_depth = 10.f;
Emboss::ProjectZ projection(z_depth);
#if 0
indexed_triangle_set text = Emboss::polygons2model(shape, projection);
BoundingBoxf3 bbox = bounding_box(text);
CHECK(!text.indices.empty());
#endif
auto cube = its_make_cube(782 - 49 + 50, 724 + 10 + 50, 5);
its_translate(cube, Vec3f(49 - 25, -10 - 25, 2.5));
MeshBoolean::cgal2::CGALMesh cgalcube, cgaltext;
auto object_face_source_id = cgalcube.add_property_map<MeshBoolean::cgal2::CGALMesh::Face_index, int32_t>("f:object_face_source_id").first;
MeshBoolean::cgal2::triangle_mesh_to_cgal(cube.vertices, cube.indices, cgalcube, object_face_source_id);
auto edge_glyph_id = cgaltext.add_property_map<MeshBoolean::cgal2::CGALMesh::Edge_index, GlyphID>("e:glyph_id").first;
auto face_glyph_id = cgaltext.add_property_map<MeshBoolean::cgal2::CGALMesh::Face_index, GlyphID>("f:glyph_id").first;
auto vertex_glyph_id = cgalcube.add_property_map<MeshBoolean::cgal2::CGALMesh::Vertex_index, GlyphID>("v:glyph_id").first;
MeshBoolean::cgal2::glyph2model(shape, 0, projection, cgaltext, edge_glyph_id, face_glyph_id);
struct Visitor {
using TriangleMesh = Slic3r::MeshBoolean::cgal2::CGALMesh;
const TriangleMesh &object;
const TriangleMesh &glyphs;
// Properties of the glyphs mesh:
TriangleMesh::Property_map<CGAL::SM_Edge_index, GlyphID> glyph_id_edge;
TriangleMesh::Property_map<CGAL::SM_Face_index, GlyphID> glyph_id_face;
// Properties of the object mesh.
TriangleMesh::Property_map<CGAL::SM_Face_index, int32_t> object_face_source_id;
TriangleMesh::Property_map<CGAL::SM_Vertex_index, GlyphID> object_vertex_glyph_id;
typedef boost::graph_traits<TriangleMesh> GT;
typedef typename GT::face_descriptor face_descriptor;
typedef typename GT::halfedge_descriptor halfedge_descriptor;
typedef typename GT::vertex_descriptor vertex_descriptor;
int32_t source_face_id;
void before_subface_creations(face_descriptor f_old, TriangleMesh& mesh)
{
assert(&mesh == &object);
source_face_id = object_face_source_id[f_old];
}
void after_subface_created(face_descriptor f_new, TriangleMesh& mesh) {
assert(&mesh == &object);
object_face_source_id[f_new] = source_face_id;
}
std::vector<const GlyphID*> intersection_point_glyph;
// Intersecting an edge hh_edge from tm_edge with a face hh_face of tm_face.
void intersection_point_detected(
// ID of the intersection point, starting at 0. Ids are consecutive.
std::size_t i_id,
// Dimension of a simplex part of face(hh_face) that is intersected by hh_edge:
// 0 for vertex: target(hh_face)
// 1 for edge: hh_face
// 2 for the interior of face: face(hh_face)
int simplex_dimension,
// Edge of tm_edge, see edge_source_coplanar_with_face & edge_target_coplanar_with_face whether any vertex of hh_edge is coplanar with face(hh_face).
halfedge_descriptor hh_edge,
// Vertex, halfedge or face of tm_face intersected by hh_edge, see comment at simplex_dimension.
halfedge_descriptor hh_face,
// Mesh containing hh_edge
const TriangleMesh& tm_edge,
// Mesh containing hh_face
const TriangleMesh& tm_face,
// source(hh_edge) is coplanar with face(hh_face).
bool edge_source_coplanar_with_face,
// target(hh_edge) is coplanar with face(hh_face).
bool edge_target_coplanar_with_face)
{
if (i_id <= intersection_point_glyph.size()) {
intersection_point_glyph.reserve(Slic3r::next_highest_power_of_2(i_id + 1));
intersection_point_glyph.resize(i_id + 1);
}
const GlyphID* glyph = nullptr;
if (&tm_face == &glyphs) {
assert(&tm_edge == &object);
switch (simplex_dimension) {
case 1:
// edge x edge intersection
glyph = &glyph_id_edge[glyphs.edge(hh_face)];
break;
case 2:
// edge x face intersection
glyph = &glyph_id_face[glyphs.face(hh_face)];
break;
default:
assert(false);
}
if (edge_source_coplanar_with_face)
object_vertex_glyph_id[object.source(hh_edge)] = *glyph;
if (edge_target_coplanar_with_face)
object_vertex_glyph_id[object.target(hh_edge)] = *glyph;
}
else {
assert(&tm_edge == &glyphs && &tm_face == &object);
assert(!edge_source_coplanar_with_face);
assert(!edge_target_coplanar_with_face);
glyph = &glyph_id_edge[glyphs.edge(hh_edge)];
if (simplex_dimension)
object_vertex_glyph_id[object.target(hh_face)] = *glyph;
}
intersection_point_glyph[i_id] = glyph;
}
void new_vertex_added(std::size_t node_id, vertex_descriptor vh, const TriangleMesh &tm)
{
assert(&tm == &object);
assert(node_id < intersection_point_glyph.size());
const GlyphID * glyph = intersection_point_glyph[node_id];
assert(glyph != nullptr);
assert(glyph->glyph != -1);
assert(glyph->expoly != -1);
assert(glyph->contour != -1);
assert(glyph->idx != -1);
object_vertex_glyph_id[vh] = glyph ? *glyph : GlyphID{};
}
void after_subface_creations(TriangleMesh&) {}
void before_subface_created(TriangleMesh&) {}
void before_edge_split(halfedge_descriptor /* h */, TriangleMesh& /* tm */) {}
void edge_split(halfedge_descriptor /* hnew */, TriangleMesh& /* tm */) {}
void after_edge_split() {}
void add_retriangulation_edge(halfedge_descriptor /* h */, TriangleMesh& /* tm */) {}
}
visitor { cgalcube, cgaltext, edge_glyph_id, face_glyph_id, object_face_source_id, vertex_glyph_id };
auto ecm = get(CGAL::dynamic_edge_property_t<bool>(), cgalcube);
auto ecm2 = get(CGAL::dynamic_edge_property_t<bool>(), cgaltext);
const auto& p = CGAL::Polygon_mesh_processing::parameters::throw_on_self_intersection(false).visitor(visitor).edge_is_constrained_map(ecm);
const auto& q = CGAL::Polygon_mesh_processing::parameters::throw_on_self_intersection(false).visitor(visitor).edge_is_constrained_map(ecm2).do_not_modify(true);
// CGAL::Polygon_mesh_processing::corefine(cgalcube, cgalcube2, p, p);
CGAL::Polygon_mesh_processing::corefine(cgalcube, cgaltext, p, q);
auto vertex_colors = cgalcube.add_property_map<MeshBoolean::cgal2::CGALMesh::Vertex_index, CGAL::Color>("v:color").first;
auto face_colors = cgalcube.add_property_map<MeshBoolean::cgal2::CGALMesh::Face_index, CGAL::Color>("f:color").first;
const CGAL::Color marked { 255, 0, 0 };
for (auto fi : cgalcube.faces()) {
CGAL::Color color(0, 255, 0);
auto hi_end = cgalcube.halfedge(fi);
auto hi = hi_end;
do {
if (get(ecm, cgalcube.edge(hi))) {
// This face has a constrained edge.
GlyphID g1 = vertex_glyph_id[cgalcube.source(hi)];
GlyphID g2 = vertex_glyph_id[cgalcube.target(hi)];
assert(g1.glyph != -1 && g1.glyph == g2.glyph);
assert(g1.expoly != -1 && g1.expoly == g2.expoly);
assert(g1.contour != -1 && g1.contour == g2.contour);
assert(g1.idx != -1);
assert(g2.idx != -1);
const auto &expoly = glyph->shape[g1.expoly];
const auto &contour = g1.contour == 0 ? expoly.contour : expoly.holes[g1.contour - 1];
bool ccw = false;
int32_t i1 = g1.idx / 4;
int32_t i2 = g2.idx / 4;
if (g1.idx < g2.idx) {
if (i1 == 0 && i2 + 1 == contour.size()) {
// cw
} else {
ccw = true;
}
} else {
if (i2 == 0 && i1 + 1 == contour.size()) {
ccw = true;
std::swap(g1, g2);
std::swap(i1, i2);
}
}
if (ccw) {
// Face is left of a constrained edge.
// Check whether the face is facing forward or backwards.
int type = g1.idx % 4;
// The object vertex intersects glyph edge. Take front point of the intersecting glyph edge.
const auto& p = cgaltext.point(MeshBoolean::cgal2::CGALMesh::Vertex_index((i1 + (type >= 2)) * 2 + 1));
// Is this face oriented towards p or away from p?
auto abcp = CGAL::orientation(cgalcube.point(cgalcube.source(hi)), cgalcube.point(cgalcube.target(hi)), cgalcube.point(cgalcube.target(cgalcube.next(hi))), p);
assert(abcp != CGAL::COPLANAR);
if (abcp == CGAL::POSITIVE)
color = marked;
}
break;
}
hi = cgalcube.next(hi);
} while (hi != hi_end);
face_colors[fi] = color;
}
// Seed fill the other faces inside the region.
std::vector<MeshBoolean::cgal2::CGALMesh::Face_index> queue;
for (auto fi_seed : cgalcube.faces())
if (face_colors[fi_seed] != marked) {
// Is this face completely unconstrained?
auto hi = cgalcube.halfedge(fi_seed);
auto hi_prev = cgalcube.prev(hi);
auto hi_next = cgalcube.next(hi);
if (! get(ecm, cgalcube.edge(hi)) && ! get(ecm, cgalcube.edge(hi_prev)) && ! get(ecm, cgalcube.edge(hi_next))) {
queue.emplace_back(fi_seed);
do {
auto fi = queue.back();
queue.pop_back();
auto hi = cgalcube.halfedge(fi);
auto hi_prev = cgalcube.prev(hi);
auto hi_next = cgalcube.next(hi);
assert(! get(ecm, cgalcube.edge(hi)) && ! get(ecm, cgalcube.edge(hi_prev)) && ! get(ecm, cgalcube.edge(hi_next)));
auto this_opposite = cgalcube.face(cgalcube.opposite(hi));
bool this_marked = face_colors[this_opposite] == marked;
auto prev_opposite = cgalcube.face(cgalcube.opposite(hi_prev));
bool prev_marked = face_colors[prev_opposite] == marked;
auto next_opposite = cgalcube.face(cgalcube.opposite(hi_next));
bool next_marked = face_colors[next_opposite] == marked;
int num_marked = this_marked + prev_marked + next_marked;
if (num_marked >= 2) {
face_colors[fi] = marked;
if (num_marked == 2)
queue.emplace_back(! this_marked ? this_opposite : ! prev_marked ? prev_opposite : next_opposite);
}
} while (! queue.empty());
}
}
// Mapping of its_extruded faces to source faces.
enum class FaceType : int32_t {
Unknown = -1,
Unmarked = -2,
UnmarkedSplit = -3,
Marked = -4,
MarkedSplit = -5,
UnmarkedEmitted = -6,
};
std::vector<int32_t> map_faces(cube.indices.size(), int32_t(FaceType::Unknown));
for (auto fi_seed : cgalcube.faces()) {
int32_t &state = map_faces[object_face_source_id[fi_seed]];
bool m = face_colors[fi_seed] == marked;
switch (state) {
case int32_t(FaceType::Unknown):
state = m ? int32_t(FaceType::Marked) : int32_t(FaceType::Unmarked);
break;
case int32_t(FaceType::Unmarked):
case int32_t(FaceType::UnmarkedSplit):
state = m ? int32_t(FaceType::MarkedSplit) : int32_t(FaceType::UnmarkedSplit);
break;
case int32_t(FaceType::Marked):
case int32_t(FaceType::MarkedSplit):
state = int32_t(FaceType::MarkedSplit);
break;
default:
assert(false);
}
}
CGAL::IO::write_OFF("c:\\data\\temp\\corefined.off", cgalcube);
indexed_triangle_set its_extruded;
its_extruded.indices.reserve(cgalcube.number_of_faces());
its_extruded.vertices.reserve(cgalcube.number_of_vertices());
// Mapping of its_extruded vertices (original and offsetted) to cgalcuble's vertices.
std::vector<std::pair<int32_t, int32_t>> map_vertices(cgalcube.number_of_vertices(), std::pair<int32_t, int32_t>{-1, -1});
Vec3f extrude_dir { 0, 0, 5.f };
for (auto fi : cgalcube.faces()) {
const int32_t source_face_id = object_face_source_id[fi];
const int32_t state = map_faces[source_face_id];
assert(state == int32_t(FaceType::Unmarked) || state == int32_t(FaceType::UnmarkedSplit) || state == int32_t(FaceType::UnmarkedEmitted) ||
state == int32_t(FaceType::Marked) || state == int32_t(FaceType::MarkedSplit));
if (state == int32_t(FaceType::UnmarkedEmitted)) {
// Already emitted.
} else if (state == int32_t(FaceType::Unmarked) || state == int32_t(FaceType::UnmarkedSplit)) {
// Just copy the unsplit source face.
const Vec3i source_vertices = cube.indices[source_face_id];
Vec3i target_vertices;
for (int i = 0; i < 3; ++i) {
target_vertices(i) = map_vertices[source_vertices(i)].first;
if (target_vertices(i) == -1) {
map_vertices[source_vertices(i)].first = target_vertices(i) = int(its_extruded.vertices.size());
its_extruded.vertices.emplace_back(cube.vertices[source_vertices(i)]);
}
}
its_extruded.indices.emplace_back(target_vertices);
map_faces[source_face_id] = int32_t(FaceType::UnmarkedEmitted);
} else {
auto hi = cgalcube.halfedge(fi);
auto hi_prev = cgalcube.prev(hi);
auto hi_next = cgalcube.next(hi);
const Vec3i source_vertices{ int((std::size_t)cgalcube.target(hi)), int((std::size_t)cgalcube.target(hi_next)), int((std::size_t)cgalcube.target(hi_prev)) };
Vec3i target_vertices;
if (face_colors[fi] == marked) {
// Extrude the face. Neighbor edges separating extruded face from non-extruded face will be extruded.
bool boundary_vertex[3] = { false, false, false };
Vec3i target_vertices_extruded { -1, -1, -1 };
for (int i = 0; i < 3; ++i) {
if (face_colors[cgalcube.face(cgalcube.opposite(hi))] != marked)
// Edge separating extruded / non-extruded region.
boundary_vertex[i] = boundary_vertex[(i + 2) % 3] = true;
hi = cgalcube.next(hi);
}
for (int i = 0; i < 3; ++ i) {
target_vertices_extruded(i) = map_vertices[source_vertices(i)].second;
if (target_vertices_extruded(i) == -1) {
map_vertices[source_vertices(i)].second = target_vertices_extruded(i) = int(its_extruded.vertices.size());
const auto& p = cgalcube.point(cgalcube.target(hi));
its_extruded.vertices.emplace_back(Vec3f{ float(p.x()), float(p.y()), float(p.z()) } + extrude_dir);
}
if (boundary_vertex[i]) {
target_vertices(i) = map_vertices[source_vertices(i)].first;
if (target_vertices(i) == -1) {
map_vertices[source_vertices(i)].first = target_vertices(i) = int(its_extruded.vertices.size());
const auto& p = cgalcube.point(cgalcube.target(hi));
its_extruded.vertices.emplace_back(p.x(), p.y(), p.z());
}
}
hi = cgalcube.next(hi);
}
its_extruded.indices.emplace_back(target_vertices_extruded);
// Add the sides.
for (int i = 0; i < 3; ++ i) {
int j = (i + 1) % 3;
assert(target_vertices_extruded[i] != -1 && target_vertices_extruded[j] != -1);
if (boundary_vertex[i] && boundary_vertex[j]) {
assert(target_vertices[i] != -1 && target_vertices[j] != -1);
its_extruded.indices.emplace_back(Vec3i{ target_vertices[i], target_vertices[j], target_vertices_extruded[i] });
its_extruded.indices.emplace_back(Vec3i{ target_vertices_extruded[i], target_vertices[j], target_vertices_extruded[j] });
}
}
} else {
// Copy the face.
Vec3i target_vertices;
for (int i = 0; i < 3; ++ i) {
target_vertices(i) = map_vertices[source_vertices(i)].first;
if (target_vertices(i) == -1) {
map_vertices[source_vertices(i)].first = target_vertices(i) = int(its_extruded.vertices.size());
const auto &p = cgalcube.point(cgalcube.target(hi));
its_extruded.vertices.emplace_back(p.x(), p.y(), p.z());
}
hi = cgalcube.next(hi);
}
its_extruded.indices.emplace_back(target_vertices);
}
}
}
its_write_obj(its_extruded, "c:\\data\\temp\\text-extruded.obj");
indexed_triangle_set edges_its;
std::vector<Vec3f> edges_its_colors;
for (auto ei : cgalcube.edges())
if (cgalcube.is_valid(ei)) {
const auto &p1 = cgalcube.point(cgalcube.vertex(ei, 0));
const auto &p2 = cgalcube.point(cgalcube.vertex(ei, 1));
bool constrained = get(ecm, ei);
Vec3f color = constrained ? Vec3f{ 1.f, 0, 0 } : Vec3f{ 0, 1., 0 };
edges_its.indices.emplace_back(Vec3i(edges_its.vertices.size(), edges_its.vertices.size() + 1, edges_its.vertices.size() + 2));
edges_its.vertices.emplace_back(Vec3f(p1.x(), p1.y(), p1.z()));
edges_its.vertices.emplace_back(Vec3f(p2.x(), p2.y(), p2.z()));
edges_its.vertices.emplace_back(Vec3f(p2.x(), p2.y(), p2.z() + 0.001));
edges_its_colors.emplace_back(color);
edges_its_colors.emplace_back(color);
edges_its_colors.emplace_back(color);
}
its_write_obj(edges_its, edges_its_colors, "c:\\data\\temp\\corefined-edges.obj");
// MeshBoolean::cgal::minus(cube, cube2);
// REQUIRE(!MeshBoolean::cgal::does_self_intersect(cube));
}

557
tests/libslic3r/test_emboss.cpp
View File

@ -5,6 +5,7 @@
#include <optional>
#include <libslic3r/AABBTreeIndirect.hpp>
#include <libslic3r/Utils.hpp> // for next_highest_power_of_2()
using namespace Slic3r;
@ -250,3 +251,559 @@ TEST_CASE("Italic check", "[]")
CHECK(exist_non_italic);
}
#endif // not __APPLE__
#include <CGAL/Polygon_mesh_processing/corefinement.h>
#include <CGAL/Exact_integer.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Cartesian_converter.h>
// Referencing a glyph contour (an ExPolygon) plus a vertex base of the contour.
struct GlyphContour {
// Index of a glyph in a vector of glyphs.
int32_t glyph{ -1 };
// Index of an ExPolygon in ExPolygons of a glyph.
int32_t expoly{ -1 };
// Index of a contour in ExPolygon.
// 0 - outer contour, >0 - hole
int32_t contour{ -1 };
// Base of the zero'th point of a contour in text mesh.
// There are two vertices (front and rear) created for each contour,
// thus there are 2x more vertices in text mesh than the number of contour points.
int32_t vertex_base{ -1 };
};
struct GlyphID
{
int32_t glyph_contour{ -1 };
// vertex or edge ID, where edge ID is the index of the source point.
// There are 4 consecutive indices generated for a single glyph edge:
// 0th - 1st text edge (straight)
// 1th - 1st text face
// 2nd - 2nd text edge (diagonal)
// 3th - 2nd text face
int32_t idx { -1 };
GlyphID& operator++() { ++idx; return *this; }
};
namespace Slic3r::MeshBoolean::cgal2 {
namespace CGALProc = CGAL::Polygon_mesh_processing;
namespace CGALParams = CGAL::Polygon_mesh_processing::parameters;
// using EpecKernel = CGAL::Exact_predicates_exact_constructions_kernel;
using EpicKernel = CGAL::Exact_predicates_inexact_constructions_kernel;
using _EpicMesh = CGAL::Surface_mesh<EpicKernel::Point_3>;
// using _EpecMesh = CGAL::Surface_mesh<EpecKernel::Point_3>;
using CGALMesh = _EpicMesh;
// Add an indexed triangle mesh to CGAL Surface_mesh.
// Store map of CGAL face to source face index into object_face_source_id.
void triangle_mesh_to_cgal(
const std::vector<stl_vertex> &V,
const std::vector<stl_triangle_vertex_indices> &F,
CGALMesh &out,
CGALMesh::Property_map<CGAL::SM_Face_index, int32_t> object_face_source_id)
{
if (F.empty())
return;
size_t vertices_count = V.size();
size_t edges_count = (F.size() * 3) / 2;
size_t faces_count = F.size();
out.reserve(vertices_count, edges_count, faces_count);
for (auto& v : V)
out.add_vertex(typename CGALMesh::Point{ v.x(), v.y(), v.z() });
using VI = typename CGALMesh::Vertex_index;
for (auto& f : F) {
auto fid = out.add_face(VI(f(0)), VI(f(1)), VI(f(2)));
object_face_source_id[fid] = int32_t(&f - &F.front());
}
}
void glyph2model(
const ExPolygons &glyph,
int32_t glyph_id,
const Slic3r::Emboss::IProject &projection,
CGALMesh &out,
std::vector<GlyphContour> &glyph_contours,
CGALMesh::Property_map<CGAL::SM_Edge_index, GlyphID> &glyph_id_edge,
CGALMesh::Property_map<CGAL::SM_Face_index, GlyphID> &glyph_id_face)
{
std::vector<CGALMesh::Vertex_index> indices;
auto insert_contour = [&projection, &indices , &out, glyph_id, &glyph_contours, &glyph_id_edge, &glyph_id_face](const Polygon& polygon, int32_t iexpoly, int32_t id) {
indices.clear();
indices.reserve(polygon.points.size() * 2);
size_t num_vertices_old = out.number_of_vertices();
GlyphID glid{ int32_t(glyph_contours.size()), 0 };
glyph_contours.push_back({ glyph_id, iexpoly, id, int32_t(num_vertices_old) });
for (const Point& p2 : polygon.points) {
auto p = projection.project(p2);
auto vi = out.add_vertex(typename CGALMesh::Point{ p.first.x(), p.first.y(), p.first.z() });
assert((size_t)vi == indices.size() + num_vertices_old);
indices.emplace_back(vi);
vi = out.add_vertex(typename CGALMesh::Point{ p.second.x(), p.second.y(), p.second.z() });
assert((size_t)vi == indices.size() + num_vertices_old);
indices.emplace_back(vi);
}
for (int32_t i = 0; i < int32_t(indices.size()); i += 2) {
int32_t j = (i + 2) % int32_t(indices.size());
auto find_edge = [&out](CGALMesh::Face_index fi, CGALMesh::Vertex_index from, CGALMesh::Vertex_index to) {
CGALMesh::Halfedge_index hi = out.halfedge(fi);
for (; out.target(hi) != to; hi = out.next(hi));
assert(out.source(hi) == from);
assert(out.target(hi) == to);
return hi;
};
auto fi = out.add_face(indices[i], indices[i + 1], indices[j]);
glyph_id_edge[out.edge(find_edge(fi, indices[i], indices[i + 1]))] = glid;
glyph_id_face[fi] = ++ glid;
glyph_id_edge[out.edge(find_edge(fi, indices[i + 1], indices[j]))] = ++ glid;
glyph_id_face[out.add_face(indices[j], indices[i + 1], indices[j + 1])] = ++ glid;
++ glid;
}
};
size_t count_point = count_points(glyph);
out.reserve(out.number_of_vertices() + 2 * count_point, out.number_of_edges() + 4 * count_point, out.number_of_faces() + 2 * count_point);
for (const ExPolygon &expolygon : glyph) {
int32_t idx_contour = &expolygon - &glyph.front();
insert_contour(expolygon.contour, idx_contour, 0);
for (const Polygon& hole : expolygon.holes)
insert_contour(hole, idx_contour, 1 + (&hole - &expolygon.holes.front()));
}
}
}
bool its_write_obj(const indexed_triangle_set& its, const std::vector<Vec3f> &color, const char* file)
{
Slic3r::CNumericLocalesSetter locales_setter;
FILE* fp = fopen(file, "w");
if (fp == nullptr) {
return false;
}
for (size_t i = 0; i < its.vertices.size(); ++i)
fprintf(fp, "v %f %f %f %f %f %f\n",
its.vertices[i](0), its.vertices[i](1), its.vertices[i](2),
color[i](0), color[i](1), color[i](2));
for (size_t i = 0; i < its.indices.size(); ++i)
fprintf(fp, "f %d %d %d\n", its.indices[i][0] + 1, its.indices[i][1] + 1, its.indices[i][2] + 1);
fclose(fp);
return true;
}
TEST_CASE("Emboss extrude cut", "[Emboss-Cut]")
{
std::string font_path = std::string(TEST_DATA_DIR) + "/fonts/NotoSans-Regular.ttf";
char letter = '%';
float flatness = 2.;
auto font = Emboss::load_font(font_path.c_str());
REQUIRE(font != nullptr);
std::optional<Emboss::Glyph> glyph = Emboss::letter2glyph(*font, letter, flatness);
REQUIRE(glyph.has_value());
ExPolygons shape = glyph->shape;
REQUIRE(!shape.empty());
float z_depth = 50.f;
Emboss::ProjectZ projection(z_depth);
#if 0
indexed_triangle_set text = Emboss::polygons2model(shape, projection);
BoundingBoxf3 bbox = bounding_box(text);
CHECK(!text.indices.empty());
#endif
auto cube = its_make_cube(782 - 49 + 50, 724 + 10 + 50, 5);
its_translate(cube, Vec3f(49 - 25, -10 - 25, 2.5));
auto cube2 = cube;
// its_translate(cube2, Vec3f(0, 0, 40));
its_translate(cube2, Vec3f(0, -40, 40));
for (auto &face : cube2.indices)
for (int i = 0; i < 3; ++ i)
face(i) += int(cube.vertices.size());
append(cube.vertices, cube2.vertices);
append(cube.indices, cube2.indices);
MeshBoolean::cgal2::CGALMesh cgalcube, cgaltext;
auto object_face_source_id = cgalcube.add_property_map<MeshBoolean::cgal2::CGALMesh::Face_index, int32_t>("f:object_face_source_id").first;
MeshBoolean::cgal2::triangle_mesh_to_cgal(cube.vertices, cube.indices, cgalcube, object_face_source_id);
auto edge_glyph_id = cgaltext.add_property_map<MeshBoolean::cgal2::CGALMesh::Edge_index, GlyphID>("e:glyph_id").first;
auto face_glyph_id = cgaltext.add_property_map<MeshBoolean::cgal2::CGALMesh::Face_index, GlyphID>("f:glyph_id").first;
auto vertex_glyph_id = cgalcube.add_property_map<MeshBoolean::cgal2::CGALMesh::Vertex_index, GlyphID>("v:glyph_id").first;
std::vector<GlyphContour> glyph_contours;
MeshBoolean::cgal2::glyph2model(shape, 0, projection, cgaltext, glyph_contours, edge_glyph_id, face_glyph_id);
struct Visitor {
using TriangleMesh = Slic3r::MeshBoolean::cgal2::CGALMesh;
const TriangleMesh &object;
const TriangleMesh &glyphs;
// const std::vector<GlyphContour> &glyph_contours;
// Properties of the glyphs mesh:
TriangleMesh::Property_map<CGAL::SM_Edge_index, GlyphID> glyph_id_edge;
TriangleMesh::Property_map<CGAL::SM_Face_index, GlyphID> glyph_id_face;
// Properties of the object mesh.
TriangleMesh::Property_map<CGAL::SM_Face_index, int32_t> object_face_source_id;
TriangleMesh::Property_map<CGAL::SM_Vertex_index, GlyphID> object_vertex_glyph_id;
typedef boost::graph_traits<TriangleMesh> GT;
typedef typename GT::face_descriptor face_descriptor;
typedef typename GT::halfedge_descriptor halfedge_descriptor;
typedef typename GT::vertex_descriptor vertex_descriptor;
int32_t source_face_id;
void before_subface_creations(face_descriptor f_old, TriangleMesh& mesh)
{
assert(&mesh == &object);
source_face_id = object_face_source_id[f_old];
}
void after_subface_created(face_descriptor f_new, TriangleMesh& mesh) {
assert(&mesh == &object);
object_face_source_id[f_new] = source_face_id;
}
std::vector<const GlyphID*> intersection_point_glyph;
// Intersecting an edge hh_edge from tm_edge with a face hh_face of tm_face.
void intersection_point_detected(
// ID of the intersection point, starting at 0. Ids are consecutive.
std::size_t i_id,
// Dimension of a simplex part of face(hh_face) that is intersected by hh_edge:
// 0 for vertex: target(hh_face)
// 1 for edge: hh_face
// 2 for the interior of face: face(hh_face)
int simplex_dimension,
// Edge of tm_edge, see edge_source_coplanar_with_face & edge_target_coplanar_with_face whether any vertex of hh_edge is coplanar with face(hh_face).
halfedge_descriptor hh_edge,
// Vertex, halfedge or face of tm_face intersected by hh_edge, see comment at simplex_dimension.
halfedge_descriptor hh_face,
// Mesh containing hh_edge
const TriangleMesh& tm_edge,
// Mesh containing hh_face
const TriangleMesh& tm_face,
// source(hh_edge) is coplanar with face(hh_face).
bool edge_source_coplanar_with_face,
// target(hh_edge) is coplanar with face(hh_face).
bool edge_target_coplanar_with_face)
{
if (i_id <= intersection_point_glyph.size()) {
intersection_point_glyph.reserve(Slic3r::next_highest_power_of_2(i_id + 1));
intersection_point_glyph.resize(i_id + 1);
}
const GlyphID* glyph = nullptr;
if (&tm_face == &glyphs) {
assert(&tm_edge == &object);
switch (simplex_dimension) {
case 1:
// edge x edge intersection
glyph = &glyph_id_edge[glyphs.edge(hh_face)];
break;
case 2:
// edge x face intersection
glyph = &glyph_id_face[glyphs.face(hh_face)];
break;
default:
assert(false);
}
if (edge_source_coplanar_with_face)
object_vertex_glyph_id[object.source(hh_edge)] = *glyph;
if (edge_target_coplanar_with_face)
object_vertex_glyph_id[object.target(hh_edge)] = *glyph;
} else {
assert(&tm_edge == &glyphs && &tm_face == &object);
assert(!edge_source_coplanar_with_face);
assert(!edge_target_coplanar_with_face);
glyph = &glyph_id_edge[glyphs.edge(hh_edge)];
if (simplex_dimension == 0)
object_vertex_glyph_id[object.target(hh_face)] = *glyph;
}
intersection_point_glyph[i_id] = glyph;
}
void new_vertex_added(std::size_t node_id, vertex_descriptor vh, const TriangleMesh &tm)
{
assert(&tm == &object);
assert(node_id < intersection_point_glyph.size());
const GlyphID * glyph = intersection_point_glyph[node_id];
assert(glyph != nullptr);
assert(glyph->glyph_contour != -1);
assert(glyph->idx != -1);
object_vertex_glyph_id[vh] = glyph ? *glyph : GlyphID{};
}
void after_subface_creations(TriangleMesh&) {}
void before_subface_created(TriangleMesh&) {}
void before_edge_split(halfedge_descriptor /* h */, TriangleMesh& /* tm */) {}
void edge_split(halfedge_descriptor /* hnew */, TriangleMesh& /* tm */) {}
void after_edge_split() {}
void add_retriangulation_edge(halfedge_descriptor /* h */, TriangleMesh& /* tm */) {}
}
visitor { cgalcube, cgaltext, /* glyph_contours, */ edge_glyph_id, face_glyph_id, object_face_source_id, vertex_glyph_id};
auto ecm = get(CGAL::dynamic_edge_property_t<bool>(), cgalcube);
const auto& p = CGAL::Polygon_mesh_processing::parameters::throw_on_self_intersection(false).visitor(visitor).edge_is_constrained_map(ecm);
const auto& q = CGAL::Polygon_mesh_processing::parameters::visitor(visitor).do_not_modify(true);
// CGAL::Polygon_mesh_processing::corefine(cgalcube, cgalcube2, p, p);
CGAL::Polygon_mesh_processing::corefine(cgalcube, cgaltext, p, q);
auto vertex_colors = cgalcube.add_property_map<MeshBoolean::cgal2::CGALMesh::Vertex_index, CGAL::Color>("v:color").first;
auto face_colors = cgalcube.add_property_map<MeshBoolean::cgal2::CGALMesh::Face_index, CGAL::Color>("f:color").first;
const CGAL::Color marked { 255, 0, 0 };
for (auto fi : cgalcube.faces()) {
CGAL::Color color(0, 255, 0);
auto hi_end = cgalcube.halfedge(fi);
auto hi = hi_end;
do {
if (get(ecm, cgalcube.edge(hi))) {
// This face has a constrained edge.
GlyphID g1 = vertex_glyph_id[cgalcube.source(hi)];
GlyphID g2 = vertex_glyph_id[cgalcube.target(hi)];
assert(g1.glyph_contour != -1 && g1.glyph_contour == g2.glyph_contour);
assert(g1.idx != -1);
assert(g2.idx != -1);
const GlyphContour &glyph_contour = glyph_contours[g1.glyph_contour];
const auto &expoly = glyph->shape[glyph_contour.expoly];
const auto &contour = glyph_contour.contour == 0 ? expoly.contour : expoly.holes[glyph_contour.contour - 1];
bool inside = false;
int32_t i1 = g1.idx / 4;
int32_t i2 = g2.idx / 4;
if (g1.idx == g2.idx) {
// Crossing both object vertices with the same glyph face.
int type = g1.idx % 4;
assert(type == 1 || type == 3);
const auto& p = cgalcube.point(cgalcube.target(cgalcube.next(hi)));
int i = i1 * 2;
int j = (i1 + 1 == int(contour.size())) ? 0 : i + 2;
i += glyph_contour.vertex_base;
j += glyph_contour.vertex_base;
auto abcp = type == 1 ?
CGAL::orientation(cgaltext.point(CGAL::SM_Vertex_index(i)), cgaltext.point(CGAL::SM_Vertex_index(i + 1)), cgaltext.point(CGAL::SM_Vertex_index(j)), p) :
CGAL::orientation(cgaltext.point(CGAL::SM_Vertex_index(j)), cgaltext.point(CGAL::SM_Vertex_index(i + 1)), cgaltext.point(CGAL::SM_Vertex_index(j + 1)), p);
inside = abcp == CGAL::POSITIVE;
} else if (g1.idx < g2.idx) {
if (i1 == 0 && i2 + 1 == contour.size()) {
// cw
} else {
inside = true;
}
} else {
if (i2 == 0 && i1 + 1 == contour.size()) {
inside = true;
std::swap(g1, g2);
std::swap(i1, i2);
}
}
if (inside) {
// Is this face oriented towards p or away from p?
const auto &a = cgalcube.point(cgalcube.source(hi));
const auto &b = cgalcube.point(cgalcube.target(hi));
const auto &c = cgalcube.point(cgalcube.target(cgalcube.next(hi)));
//FIXME prosim nahrad skutecnou projekci.
//projection.project()
const auto p = a + MeshBoolean::cgal2::EpicKernel::Vector_3(0, 0, 10);
auto abcp = CGAL::orientation(a, b, c, p);
if (abcp == CGAL::POSITIVE)
color = marked;
}
break;
}
hi = cgalcube.next(hi);
} while (hi != hi_end);
face_colors[fi] = color;
}
CGAL::IO::write_OFF("c:\\data\\temp\\corefined-0.off", cgalcube);
// Seed fill the other faces inside the region.
std::vector<MeshBoolean::cgal2::CGALMesh::Face_index> queue;
for (auto fi_seed : cgalcube.faces())
if (face_colors[fi_seed] != marked) {
// Is this face completely unconstrained?
auto hi = cgalcube.halfedge(fi_seed);
auto hi_prev = cgalcube.prev(hi);
auto hi_next = cgalcube.next(hi);
if (! get(ecm, cgalcube.edge(hi)) && ! get(ecm, cgalcube.edge(hi_prev)) && ! get(ecm, cgalcube.edge(hi_next))) {
queue.emplace_back(fi_seed);
do {
auto fi = queue.back();
queue.pop_back();
auto hi = cgalcube.halfedge(fi);
auto hi_prev = cgalcube.prev(hi);
auto hi_next = cgalcube.next(hi);
// The following condition may not apply if crossing a silhouette wrt. the glyph projection direction.
// assert(! get(ecm, cgalcube.edge(hi)) && ! get(ecm, cgalcube.edge(hi_prev)) && ! get(ecm, cgalcube.edge(hi_next)));
auto this_opposite = cgalcube.face(cgalcube.opposite(hi));
bool this_marked = face_colors[this_opposite] == marked;
auto prev_opposite = cgalcube.face(cgalcube.opposite(hi_prev));
bool prev_marked = face_colors[prev_opposite] == marked;
auto next_opposite = cgalcube.face(cgalcube.opposite(hi_next));
bool next_marked = face_colors[next_opposite] == marked;
int num_marked = this_marked + prev_marked + next_marked;
if (num_marked >= 2) {
face_colors[fi] = marked;
if (num_marked == 2)
queue.emplace_back(! this_marked ? this_opposite : ! prev_marked ? prev_opposite : next_opposite);
}
} while (! queue.empty());
}
}
CGAL::IO::write_OFF("c:\\data\\temp\\corefined.off", cgalcube);
// Mapping of its_extruded faces to source faces.
enum class FaceState : int8_t {
Unknown = -1,
Unmarked = -2,
UnmarkedSplit = -3,
Marked = -4,
MarkedSplit = -5,
UnmarkedEmitted = -6,
};
std::vector<FaceState> face_states(cube.indices.size(), FaceState::Unknown);
for (auto fi_seed : cgalcube.faces()) {
FaceState &state = face_states[object_face_source_id[fi_seed]];
bool m = face_colors[fi_seed] == marked;
switch (state) {
case FaceState::Unknown:
state = m ? FaceState::Marked : FaceState::Unmarked;
break;
case FaceState::Unmarked:
case FaceState::UnmarkedSplit:
state = m ? FaceState::MarkedSplit : FaceState::UnmarkedSplit;
break;
case FaceState::Marked:
case FaceState::MarkedSplit:
state = FaceState::MarkedSplit;
break;
default:
assert(false);
}
}
indexed_triangle_set its_extruded;
its_extruded.indices.reserve(cgalcube.number_of_faces());
its_extruded.vertices.reserve(cgalcube.number_of_vertices());
// Mapping of its_extruded vertices (original and offsetted) to cgalcuble's vertices.
std::vector<std::pair<int32_t, int32_t>> map_vertices(cgalcube.number_of_vertices(), std::pair<int32_t, int32_t>{-1, -1});
Vec3f extrude_dir { 0, 0, 5.f };
for (auto fi : cgalcube.faces()) {
const int32_t source_face_id = object_face_source_id[fi];
const FaceState state = face_states[source_face_id];
assert(state == FaceState::Unmarked || state == FaceState::UnmarkedSplit || state == FaceState::UnmarkedEmitted ||
state == FaceState::Marked || state == FaceState::MarkedSplit);
if (state == FaceState::UnmarkedEmitted) {
// Already emitted.
} else if (state == FaceState::Unmarked || state == FaceState::UnmarkedSplit) {
// Just copy the unsplit source face.
const Vec3i source_vertices = cube.indices[source_face_id];
Vec3i target_vertices;
for (int i = 0; i < 3; ++i) {
target_vertices(i) = map_vertices[source_vertices(i)].first;
if (target_vertices(i) == -1) {
map_vertices[source_vertices(i)].first = target_vertices(i) = int(its_extruded.vertices.size());
its_extruded.vertices.emplace_back(cube.vertices[source_vertices(i)]);
}
}
its_extruded.indices.emplace_back(target_vertices);
face_states[source_face_id] = FaceState::UnmarkedEmitted;
} else {
auto hi = cgalcube.halfedge(fi);
auto hi_prev = cgalcube.prev(hi);
auto hi_next = cgalcube.next(hi);
const Vec3i source_vertices{ int((std::size_t)cgalcube.target(hi)), int((std::size_t)cgalcube.target(hi_next)), int((std::size_t)cgalcube.target(hi_prev)) };
Vec3i target_vertices;
if (face_colors[fi] == marked) {
// Extrude the face. Neighbor edges separating extruded face from non-extruded face will be extruded.
bool boundary_vertex[3] = { false, false, false };
Vec3i target_vertices_extruded { -1, -1, -1 };
for (int i = 0; i < 3; ++i) {
if (face_colors[cgalcube.face(cgalcube.opposite(hi))] != marked)
// Edge separating extruded / non-extruded region.
boundary_vertex[i] = boundary_vertex[(i + 2) % 3] = true;
hi = cgalcube.next(hi);
}
for (int i = 0; i < 3; ++ i) {
target_vertices_extruded(i) = map_vertices[source_vertices(i)].second;
if (target_vertices_extruded(i) == -1) {
map_vertices[source_vertices(i)].second = target_vertices_extruded(i) = int(its_extruded.vertices.size());
const auto& p = cgalcube.point(cgalcube.target(hi));
its_extruded.vertices.emplace_back(Vec3f{ float(p.x()), float(p.y()), float(p.z()) } + extrude_dir);
}
if (boundary_vertex[i]) {
target_vertices(i) = map_vertices[source_vertices(i)].first;
if (target_vertices(i) == -1) {
map_vertices[source_vertices(i)].first = target_vertices(i) = int(its_extruded.vertices.size());
const auto& p = cgalcube.point(cgalcube.target(hi));
its_extruded.vertices.emplace_back(p.x(), p.y(), p.z());
}
}
hi = cgalcube.next(hi);
}
its_extruded.indices.emplace_back(target_vertices_extruded);
// Add the sides.
for (int i = 0; i < 3; ++ i) {
int j = (i + 1) % 3;
assert(target_vertices_extruded[i] != -1 && target_vertices_extruded[j] != -1);
if (boundary_vertex[i] && boundary_vertex[j]) {
assert(target_vertices[i] != -1 && target_vertices[j] != -1);
its_extruded.indices.emplace_back(Vec3i{ target_vertices[i], target_vertices[j], target_vertices_extruded[i] });
its_extruded.indices.emplace_back(Vec3i{ target_vertices_extruded[i], target_vertices[j], target_vertices_extruded[j] });
}
}
} else {
// Copy the face.
Vec3i target_vertices;
for (int i = 0; i < 3; ++ i) {
target_vertices(i) = map_vertices[source_vertices(i)].first;
if (target_vertices(i) == -1) {
map_vertices[source_vertices(i)].first = target_vertices(i) = int(its_extruded.vertices.size());
const auto &p = cgalcube.point(cgalcube.target(hi));
its_extruded.vertices.emplace_back(p.x(), p.y(), p.z());
}
hi = cgalcube.next(hi);
}
its_extruded.indices.emplace_back(target_vertices);
}
}
}
its_write_obj(its_extruded, "c:\\data\\temp\\text-extruded.obj");
indexed_triangle_set edges_its;
std::vector<Vec3f> edges_its_colors;
for (auto ei : cgalcube.edges())
if (cgalcube.is_valid(ei)) {
const auto &p1 = cgalcube.point(cgalcube.vertex(ei, 0));
const auto &p2 = cgalcube.point(cgalcube.vertex(ei, 1));
bool constrained = get(ecm, ei);
Vec3f color = constrained ? Vec3f{ 1.f, 0, 0 } : Vec3f{ 0, 1., 0 };
edges_its.indices.emplace_back(Vec3i(edges_its.vertices.size(), edges_its.vertices.size() + 1, edges_its.vertices.size() + 2));
edges_its.vertices.emplace_back(Vec3f(p1.x(), p1.y(), p1.z()));
edges_its.vertices.emplace_back(Vec3f(p2.x(), p2.y(), p2.z()));
edges_its.vertices.emplace_back(Vec3f(p2.x(), p2.y(), p2.z() + 0.001));
edges_its_colors.emplace_back(color);
edges_its_colors.emplace_back(color);
edges_its_colors.emplace_back(color);
}
its_write_obj(edges_its, edges_its_colors, "c:\\data\\temp\\corefined-edges.obj");
// MeshBoolean::cgal::minus(cube, cube2);
// REQUIRE(!MeshBoolean::cgal::does_self_intersect(cube));
}

3
tests/libslic3r/test_triangulation.cpp
View File

@ -40,7 +40,7 @@ void store_trinagulation(const ExPolygons & shape,
}
} // namespace
/*
TEST_CASE("Triangulate rectangle with restriction on edge", "[Triangulation]")
{
// 0 1 2 3
@ -89,6 +89,7 @@ TEST_CASE("Triangulation polygon", "[triangulation]")
CHECK(tp.size() == tep.size());
CHECK(tp.size() == 3);
}
*/
TEST_CASE("Triangulation M shape polygon", "[triangulation]")
{