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Improved robustness of slicing when the slicing plane

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crosses a horizontal plane of an object exactly.
Should improve Github issues #831, #895, #1102
This commit is contained in:
bubnikv
2018-08-08 16:24:10 +02:00
parent 93b8f3147c
commit 00e9f07a03
5 changed files with 188 additions and 86 deletions
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xs/src/libslic3r/TriangleMesh.hpp
+21 -6
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@@ -76,7 +76,7 @@ private:
enum FacetEdgeType {
// A general case, the cutting plane intersect a face at two different edges.
feNone,
feGeneral,
// Two vertices are aligned with the cutting plane, the third vertex is below the cutting plane.
feTop,
// Two vertices are aligned with the cutting plane, the third vertex is above the cutting plane.
@@ -110,6 +110,11 @@ public:
class IntersectionLine : public Line
{
public:
IntersectionLine() : a_id(-1), b_id(-1), edge_a_id(-1), edge_b_id(-1), edge_type(feGeneral), flags(0) {}
bool skip() const { return (this->flags & SKIP) != 0; }
void set_skip() { this->flags |= SKIP; }
// Inherits Point a, b
// For each line end point, either {a,b}_id or {a,b}edge_a_id is set, the other is left to -1.
// Vertex indices of the line end points.
@@ -118,11 +123,16 @@ public:
// Source mesh edges of the line end points.
int edge_a_id;
int edge_b_id;
// feNone, feTop, feBottom, feHorizontal
// feGeneral, feTop, feBottom, feHorizontal
FacetEdgeType edge_type;
// Used by TriangleMeshSlicer::make_loops() to skip duplicate edges.
bool skip;
IntersectionLine() : a_id(-1), b_id(-1), edge_a_id(-1), edge_b_id(-1), edge_type(feNone), skip(false) {};
// Used by TriangleMeshSlicer::slice() to skip duplicate edges.
enum {
EDGE0 = 1,
EDGE1 = 2,
EDGE2 = 4,
SKIP = 8,
};
uint32_t flags;
};
typedef std::vector<IntersectionLine> IntersectionLines;
typedef std::vector<IntersectionLine*> IntersectionLinePtrs;
@@ -133,7 +143,12 @@ public:
TriangleMeshSlicer(TriangleMesh* _mesh);
void slice(const std::vector<float> &z, std::vector<Polygons>* layers) const;
void slice(const std::vector<float> &z, std::vector<ExPolygons>* layers) const;
bool slice_facet(float slice_z, const stl_facet &facet, const int facet_idx,
enum FacetSliceType {
NoSlice = 0,
Slicing = 1,
Cutting = 2
};
FacetSliceType slice_facet(float slice_z, const stl_facet &facet, const int facet_idx,
const float min_z, const float max_z, IntersectionLine *line_out) const;
void cut(float z, TriangleMesh* upper, TriangleMesh* lower) const;