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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup bmesh
*
* Iteratively flatten 4+ sided faces.
*/
#include "MEM_guardedalloc.h"
#include "BLI_ghash.h"
#include "BLI_math.h"
#include "bmesh.h"
#include "intern/bmesh_operators_private.h" /* own include */
#define ELE_VERT_ADJUST (1 << 0)
#define ELE_FACE_ADJUST (1 << 1)
struct VertAccum {
float co[3];
int co_tot;
};
void bmo_planar_faces_exec(BMesh *bm, BMOperator *op)
{
const float fac = BMO_slot_float_get(op->slots_in, "factor");
const int iterations = BMO_slot_int_get(op->slots_in, "iterations");
const int faces_num = BMO_slot_buffer_len(op->slots_in, "faces");
const float eps = 0.00001f;
const float eps_sq = square_f(eps);
BMOIter oiter;
BMFace *f;
BLI_mempool *vert_accum_pool;
GHash *vaccum_map;
float(*faces_center)[3];
int i, iter_step, shared_vert_num;
faces_center = MEM_mallocN(sizeof(*faces_center) * faces_num, __func__);
shared_vert_num = 0;
BMO_ITER_INDEX (f, &oiter, op->slots_in, "faces", BM_FACE, i) {
BMLoop *l_iter, *l_first;
if (f->len == 3) {
continue;
}
BM_face_calc_center_median_weighted(f, faces_center[i]);
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
if (!BMO_vert_flag_test(bm, l_iter->v, ELE_VERT_ADJUST)) {
BMO_vert_flag_enable(bm, l_iter->v, ELE_VERT_ADJUST);
shared_vert_num += 1;
}
} while ((l_iter = l_iter->next) != l_first);
BMO_face_flag_enable(bm, f, ELE_FACE_ADJUST);
}
vert_accum_pool = BLI_mempool_create(sizeof(struct VertAccum), 0, 512, BLI_MEMPOOL_NOP);
vaccum_map = BLI_ghash_ptr_new_ex(__func__, shared_vert_num);
for (iter_step = 0; iter_step < iterations; iter_step++) {
GHashIterator gh_iter;
bool changed = false;
BMO_ITER_INDEX (f, &oiter, op->slots_in, "faces", BM_FACE, i) {
BMLoop *l_iter, *l_first;
float plane[4];
if (!BMO_face_flag_test(bm, f, ELE_FACE_ADJUST)) {
continue;
}
BMO_face_flag_disable(bm, f, ELE_FACE_ADJUST);
BLI_assert(f->len != 3);
/* keep original face data (else we 'move' the face) */
#if 0
BM_face_normal_update(f);
BM_face_calc_center_median_weighted(f, f_center);
#endif
plane_from_point_normal_v3(plane, faces_center[i], f->no);
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
struct VertAccum *va;
void **va_p;
float co[3];
if (!BLI_ghash_ensure_p(vaccum_map, l_iter->v, &va_p)) {
*va_p = BLI_mempool_calloc(vert_accum_pool);
}
va = *va_p;
closest_to_plane_normalized_v3(co, plane, l_iter->v->co);
va->co_tot += 1;
interp_v3_v3v3(va->co, va->co, co, 1.0f / (float)va->co_tot);
} while ((l_iter = l_iter->next) != l_first);
}
GHASH_ITER (gh_iter, vaccum_map) {
BMVert *v = BLI_ghashIterator_getKey(&gh_iter);
struct VertAccum *va = BLI_ghashIterator_getValue(&gh_iter);
BMIter iter;
if (len_squared_v3v3(v->co, va->co) > eps_sq) {
BMO_vert_flag_enable(bm, v, ELE_VERT_ADJUST);
interp_v3_v3v3(v->co, v->co, va->co, fac);
changed = true;
}
/* tag for re-calculation */
BM_ITER_ELEM (f, &iter, v, BM_FACES_OF_VERT) {
if (f->len != 3) {
BMO_face_flag_enable(bm, f, ELE_FACE_ADJUST);
}
}
}
/* if nothing changed, break out early */
if (changed == false) {
break;
}
BLI_ghash_clear(vaccum_map, NULL, NULL);
BLI_mempool_clear(vert_accum_pool);
}
MEM_freeN(faces_center);
BLI_ghash_free(vaccum_map, NULL, NULL);
BLI_mempool_destroy(vert_accum_pool);
}
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