diff options
Diffstat (limited to 'core')
-rw-r--r-- | core/math/geometry.cpp | 35 | ||||
-rw-r--r-- | core/math/geometry.h | 2 |
2 files changed, 37 insertions, 0 deletions
diff --git a/core/math/geometry.cpp b/core/math/geometry.cpp index 12c88f43b3..194a6f6352 100644 --- a/core/math/geometry.cpp +++ b/core/math/geometry.cpp @@ -31,6 +31,7 @@ #include "geometry.h" #include "core/print_string.h" +#include "thirdparty/misc/triangulator.h" /* this implementation is very inefficient, commenting unless bugs happen. See the other one. bool Geometry::is_point_in_polygon(const Vector2 &p_point, const Vector<Vector2> &p_polygon) { @@ -737,6 +738,40 @@ PoolVector<Face3> Geometry::wrap_geometry(PoolVector<Face3> p_array, real_t *p_e return wrapped_faces; } +Vector<Vector<Vector2> > Geometry::decompose_polygon_in_convex(Vector<Point2> polygon) { + Vector<Vector<Vector2> > decomp; + List<TriangulatorPoly> in_poly, out_poly; + + TriangulatorPoly inp; + inp.Init(polygon.size()); + for (int i = 0; i < polygon.size(); i++) { + inp.GetPoint(i) = polygon[i]; + } + inp.SetOrientation(TRIANGULATOR_CCW); + in_poly.push_back(inp); + TriangulatorPartition tpart; + if (tpart.ConvexPartition_HM(&in_poly, &out_poly) == 0) { //failed! + ERR_PRINT("Convex decomposing failed!"); + return decomp; + } + + decomp.resize(out_poly.size()); + int idx = 0; + for (List<TriangulatorPoly>::Element *I = out_poly.front(); I; I = I->next()) { + TriangulatorPoly &tp = I->get(); + + decomp.write[idx].resize(tp.GetNumPoints()); + + for (int i = 0; i < tp.GetNumPoints(); i++) { + decomp.write[idx].write[i] = tp.GetPoint(i); + } + + idx++; + } + + return decomp; +} + Geometry::MeshData Geometry::build_convex_mesh(const PoolVector<Plane> &p_planes) { MeshData mesh; diff --git a/core/math/geometry.h b/core/math/geometry.h index f927a63ed5..4b478b6b16 100644 --- a/core/math/geometry.h +++ b/core/math/geometry.h @@ -950,6 +950,8 @@ public: return H; } + static Vector<Vector<Vector2> > decompose_polygon_in_convex(Vector<Point2> polygon); + static MeshData build_convex_mesh(const PoolVector<Plane> &p_planes); static PoolVector<Plane> build_sphere_planes(real_t p_radius, int p_lats, int p_lons, Vector3::Axis p_axis = Vector3::AXIS_Z); static PoolVector<Plane> build_box_planes(const Vector3 &p_extents); |