diff options
Diffstat (limited to 'core/math/geometry.h')
| -rw-r--r-- | core/math/geometry.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/core/math/geometry.h b/core/math/geometry.h index a813a90774..df63f0dabe 100644 --- a/core/math/geometry.h +++ b/core/math/geometry.h @@ -800,6 +800,21 @@ public: return Vector<Vector<Vector2> >(); } + static bool is_polygon_clockwise(const Vector<Vector2> &p_polygon) { + int c = p_polygon.size(); + if (c < 3) + return false; + const Vector2 *p = p_polygon.ptr(); + real_t sum = 0; + for (int i = 0; i < c; i++) { + const Vector2 &v1 = p[i]; + const Vector2 &v2 = p[(i + 1) % c]; + sum += (v2.x - v1.x) * (v2.y + v1.y); + } + + return sum > 0.0f; + } + static PoolVector<PoolVector<Face3> > separate_objects(PoolVector<Face3> p_array); static PoolVector<Face3> wrap_geometry(PoolVector<Face3> p_array, real_t *p_error = NULL); ///< create a "wrap" that encloses the given geometry |