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New BuildVolume class was created, which detects build volume type (rectangular,

Browse source 
circular, convex, concave) and performs efficient collision detection agains these build
volumes. As of now, collision detection is performed against a convex
hull of a concave build volume for efficency.

GCodeProcessor::Result renamed out of GCodeProcessor to GCodeProcessorResult,
so it could be forward declared.

Plater newly exports BuildVolume, not Bed3D. Bed3D is a rendering class,
while BuildVolume is a purely geometric class.

Reduced usage of global wxGetApp, the Bed3D is passed as a parameter
to View3D/Preview/GLCanvas.

Convex hull code was extracted from Geometry.cpp/hpp to Geometry/ConvexHulll.cpp,hpp.
New test inside_convex_polygon().
New efficent point inside polygon test: Decompose convex hull
to bottom / top parts and use the decomposition to detect point inside
a convex polygon in O(log n). decompose_convex_polygon_top_bottom(),
inside_convex_polygon().

New Circle constructing functions: circle_ransac() and circle_taubin_newton().

New polygon_is_convex() test with unit tests.
This commit is contained in:
Vojtech Bubnik 2021-11-16 10:15:51 +01:00
parent b431fd1f7e
commit cc44089440
51 changed files with 1544 additions and 1594 deletions
Download patch file Download diff file Expand all files Collapse all files

65
src/libslic3r/TriangleMesh.cpp
View file

@ -4,6 +4,7 @@
#include "MeshSplitImpl.hpp"
#include "ClipperUtils.hpp"
#include "Geometry.hpp"
#include "Geometry/ConvexHull.hpp"
#include "Point.hpp"
#include "Execution/ExecutionTBB.hpp"
#include "Execution/ExecutionSeq.hpp"
@ -436,27 +437,55 @@ BoundingBoxf3 TriangleMesh::transformed_bounding_box(const Transform3d &trafo) c
}
#if ENABLE_OUT_OF_BED_DETECTION_IMPROVEMENTS
BoundingBoxf3 TriangleMesh::transformed_bounding_box(const Transform3d& trafo, double world_min_z) const
BoundingBoxf3 TriangleMesh::transformed_bounding_box(const Transform3d& trafod, double world_min_z) const
{
BoundingBoxf3 bbox;
const Transform3f ftrafo = trafo.cast<float>();
for (const stl_triangle_vertex_indices& tri : its.indices) {
const Vec3f pts[3] = { ftrafo * its.vertices[tri(0)], ftrafo * its.vertices[tri(1)], ftrafo * its.vertices[tri(2)] };
int iprev = 2;
for (int iedge = 0; iedge < 3; ++iedge) {
const Vec3f& p1 = pts[iprev];
const Vec3f& p2 = pts[iedge];
if ((p1.z() < world_min_z && p2.z() > world_min_z) || (p2.z() < world_min_z && p1.z() > world_min_z)) {
// Edge crosses the z plane. Calculate intersection point with the plane.
const float t = (world_min_z - p1.z()) / (p2.z() - p1.z());
bbox.merge(Vec3f(p1.x() + (p2.x() - p1.x()) * t, p1.y() + (p2.y() - p1.y()) * t, world_min_z).cast<double>());
}
if (p2.z() >= world_min_z)
bbox.merge(p2.cast<double>());
iprev = iedge;
// 1) Allocate transformed vertices with their position with respect to print bed surface.
std::vector<char> sides;
size_t num_above = 0;
Eigen::AlignedBox<float, 3> bbox;
Transform3f trafo = trafod.cast<float>();
sides.reserve(its.vertices.size());
for (const stl_vertex &v : this->its.vertices) {
const stl_vertex pt = trafo * v;
const int sign = pt.z() > world_min_z ? 1 : pt.z() < world_min_z ? -1 : 0;
sides.emplace_back(sign);
if (sign >= 0) {
// Vertex above or on print bed surface. Test whether it is inside the build volume.
++ num_above;
bbox.extend(pt);
}
}
return bbox;
// 2) Calculate intersections of triangle edges with the build surface.
if (num_above < its.vertices.size()) {
// Not completely above the build surface and status may still change by testing edges intersecting the build platform.
for (const stl_triangle_vertex_indices &tri : its.indices) {
const int s[3] = { sides[tri(0)], sides[tri(1)], sides[tri(2)] };
if (std::min(s[0], std::min(s[1], s[2])) < 0 && std::max(s[0], std::max(s[1], s[2])) > 0) {
// Some edge of this triangle intersects the build platform. Calculate the intersection.
int iprev = 2;
for (int iedge = 0; iedge < 3; ++ iedge) {
if (s[iprev] * s[iedge] == -1) {
// edge intersects the build surface. Calculate intersection point.
const stl_vertex p1 = trafo * its.vertices[tri(iprev)];
const stl_vertex p2 = trafo * its.vertices[tri(iedge)];
// Edge crosses the z plane. Calculate intersection point with the plane.
const float t = (world_min_z - p1.z()) / (p2.z() - p1.z());
bbox.extend(Vec3f(p1.x() + (p2.x() - p1.x()) * t, p1.y() + (p2.y() - p1.y()) * t, world_min_z));
}
iprev = iedge;
}
}
}
}
BoundingBoxf3 out;
if (! bbox.isEmpty()) {
out.min = bbox.min().cast<double>();
out.max = bbox.max().cast<double>();
out.defined = true;
};
return out;
}
#endif // ENABLE_OUT_OF_BED_DETECTION_IMPROVEMENTS