diff options
Diffstat (limited to 'source/blender/bmesh/operators/bmo_normals.c')
| -rw-r--r-- | source/blender/bmesh/operators/bmo_normals.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/source/blender/bmesh/operators/bmo_normals.c b/source/blender/bmesh/operators/bmo_normals.c new file mode 100644 index 00000000000..d238644fb02 --- /dev/null +++ b/source/blender/bmesh/operators/bmo_normals.c @@ -0,0 +1,156 @@ +/* + * ***** BEGIN GPL LICENSE BLOCK ***** + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Contributor(s): Joseph Eagar, Campbell Barton + * + * ***** END GPL LICENSE BLOCK ***** + */ + +/** \file blender/bmesh/operators/bmo_normals.c + * \ingroup bmesh + * + * normal recalculation. + */ + +#include "MEM_guardedalloc.h" + +#include "BLI_math.h" + +#include "bmesh.h" + +#include "intern/bmesh_operators_private.h" /* own include */ + +/********* righthand faces implementation ****** */ + +#define FACE_VIS 1 +#define FACE_FLAG 2 +#define FACE_FLIP 8 + +/* + * put normal to the outside, and set the first direction flags in edges + * + * then check the object, and set directions / direction-flags: but only for edges with 1 or 2 faces + * this is in fact the 'select connected' + * + * in case all faces were not done: start over with 'find the ultimate ...' */ + +/* NOTE: BM_ELEM_TAG is used on faces to tell if they are flipped. */ + +void bmo_recalc_face_normals_exec(BMesh *bm, BMOperator *op) +{ + BMFace **fstack; + STACK_DECLARE(fstack); + const bool use_face_tag = BMO_slot_bool_get(op->slots_in, "use_face_tag"); + const unsigned int tot_faces = BMO_slot_buffer_count(op->slots_in, "faces"); + unsigned int tot_touch = 0; + + BMO_slot_buffer_flag_enable(bm, op->slots_in, "faces", BM_FACE, FACE_FLAG); + + fstack = MEM_mallocN(sizeof(*fstack) * tot_faces, __func__); + + while (tot_touch != tot_faces) { + BMOIter siter; + float f_len_best = -FLT_MAX; + BMFace *f, *f_start = NULL; + float f_start_cent[3]; + + /* find a starting face */ + BMO_ITER (f, &siter, op->slots_in, "faces", BM_FACE) { + float f_cent[3]; + float f_len_test; + + /* clear dirty flag */ + BM_elem_flag_disable(f, BM_ELEM_TAG); + + if (BMO_elem_flag_test(bm, f, FACE_VIS)) + continue; + + if (!f_start) f_start = f; + + BM_face_calc_center_bounds(f, f_cent); + + if ((f_len_test = len_squared_v3(f_cent)) > f_len_best) { + f_len_best = f_len_test; + f_start = f; + copy_v3_v3(f_start_cent, f_cent); + } + } + + /* check sanity (while loop ensures) */ + BLI_assert(f_start != NULL); + + /* make sure the starting face has the correct winding */ + if (dot_v3v3(f_start_cent, f_start->no) < 0.0f) { + BM_face_normal_flip(bm, f_start); + BMO_elem_flag_toggle(bm, f_start, FACE_FLIP); + + if (use_face_tag) { + BM_elem_flag_toggle(f_start, BM_ELEM_TAG); + } + } + + /* now that we've found our starting face, make all connected faces + * have the same winding. this is done recursively, using a manual + * stack (if we use simple function recursion, we'd end up overloading + * the stack on large meshes). */ + STACK_INIT(fstack); + + STACK_PUSH(fstack, f_start); + BMO_elem_flag_enable(bm, f_start, FACE_VIS); + tot_touch++; + + while ((f = STACK_POP(fstack))) { + BMIter liter; + BMLoop *l; + + BM_ITER_ELEM (l, &liter, f, BM_LOOPS_OF_FACE) { + BMLoop *l_other = l->radial_next; + + if ((l_other == l) || l_other->radial_next != l) { + continue; + } + + if (BMO_elem_flag_test(bm, l_other->f, FACE_FLAG)) { + if (!BMO_elem_flag_test(bm, l_other->f, FACE_VIS)) { + BMO_elem_flag_enable(bm, l_other->f, FACE_VIS); + tot_touch++; + + + if (l_other->v == l->v) { + BM_face_normal_flip(bm, l_other->f); + + BMO_elem_flag_toggle(bm, l_other->f, FACE_FLIP); + if (use_face_tag) { + BM_elem_flag_toggle(l_other->f, BM_ELEM_TAG); + } + } + else if (BM_elem_flag_test(l_other->f, BM_ELEM_TAG) || BM_elem_flag_test(l->f, BM_ELEM_TAG)) { + if (use_face_tag) { + BM_elem_flag_disable(l->f, BM_ELEM_TAG); + BM_elem_flag_disable(l_other->f, BM_ELEM_TAG); + } + } + + STACK_PUSH(fstack, l_other->f); + } + } + } + } + } + + MEM_freeN(fstack); +} |