diff options
Diffstat (limited to 'source/blender/bmesh/intern/bmesh_polygon.c')
-rw-r--r-- | source/blender/bmesh/intern/bmesh_polygon.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/source/blender/bmesh/intern/bmesh_polygon.c b/source/blender/bmesh/intern/bmesh_polygon.c index 8c96c938cef..8374fd8f51f 100644 --- a/source/blender/bmesh/intern/bmesh_polygon.c +++ b/source/blender/bmesh/intern/bmesh_polygon.c @@ -30,6 +30,7 @@ #include "DNA_listBase.h" #include "DNA_modifier_types.h" +#include "DNA_object_types.h" #include "MEM_guardedalloc.h" @@ -240,6 +241,30 @@ float BM_face_calc_area(const BMFace *f) } /** + * Get the area of the face in world space. + */ +float BM_face_calc_area_worldspace(Object *ob, const BMFace *f) +{ + /* inline 'area_poly_v3' logic, avoid creating a temp array */ + const BMLoop *l_iter, *l_first; + float n[3]; + + zero_v3(n); + l_iter = l_first = BM_FACE_FIRST_LOOP(f); + float rsmat[3][3]; + copy_m3_m4(rsmat, ob->obmat); + do { + float co[3], co_next[3]; + copy_v3_v3(co, l_iter->v->co); + copy_v3_v3(co_next, l_iter->next->v->co); + mul_m3_v3(rsmat, co); + mul_m3_v3(rsmat, co_next); + add_newell_cross_v3_v3v3(n, co, co_next); + } while ((l_iter = l_iter->next) != l_first); + return len_v3(n) * 0.5f; +} + +/** * compute the perimeter of an ngon */ float BM_face_calc_perimeter(const BMFace *f) @@ -256,6 +281,29 @@ float BM_face_calc_perimeter(const BMFace *f) } /** + * Calculate the perimeter of a ngon in world space. + */ +float BM_face_calc_perimeter_worldspace(Object *ob, const BMFace *f) +{ + const BMLoop *l_iter, *l_first; + float perimeter = 0.0f; + + l_iter = l_first = BM_FACE_FIRST_LOOP(f); + float rsmat[3][3]; + copy_m3_m4(rsmat, ob->obmat); + do { + float co[3], co_next[3]; + copy_v3_v3(co, l_iter->v->co); + copy_v3_v3(co_next, l_iter->next->v->co); + mul_m3_v3(rsmat, co); + mul_m3_v3(rsmat, co_next); + perimeter += len_v3v3(co, co_next); + } while ((l_iter = l_iter->next) != l_first); + + return perimeter; +} + +/** * Utility function to calculate the edge which is most different from the other two. * * \return The first edge index, where the second vertex is ``(index + 1) % 3``. |