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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup bmesh
*
* Connect verts non-planer faces iteratively (splits faces).
*/
#include "BLI_alloca.h"
#include "BLI_linklist_stack.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#include "bmesh.h"
#include "intern/bmesh_operators_private.h" /* own include */
#define EDGE_OUT (1 << 0)
#define FACE_OUT (1 << 1)
/**
* Calculates how non-planar the face subset is.
*/
static float bm_face_subset_calc_planar(BMLoop *l_first, BMLoop *l_last, const float no[3])
{
float axis_mat[3][3];
float z_prev, z_curr;
float delta_z = 0.0f;
/* Newell's Method */
BMLoop *l_iter = l_first;
BMLoop *l_term = l_last->next;
axis_dominant_v3_to_m3(axis_mat, no);
z_prev = dot_m3_v3_row_z(axis_mat, l_last->v->co);
do {
z_curr = dot_m3_v3_row_z(axis_mat, l_iter->v->co);
delta_z += fabsf(z_curr - z_prev);
z_prev = z_curr;
} while ((l_iter = l_iter->next) != l_term);
return delta_z;
}
static bool bm_face_split_find(BMesh *bm, BMFace *f, BMLoop *l_pair[2], float *r_angle_cos)
{
BMLoop *l_iter, *l_first;
BMLoop **l_arr = BLI_array_alloca(l_arr, f->len);
const uint f_len = f->len;
uint i_a, i_b;
bool found = false;
/* angle finding */
float err_best = FLT_MAX;
float angle_best_cos = -FLT_MAX;
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
i_a = 0;
do {
l_arr[i_a++] = l_iter;
} while ((l_iter = l_iter->next) != l_first);
/* now for the big search, O(N^2), however faces normally aren't so large */
for (i_a = 0; i_a < f_len; i_a++) {
BMLoop *l_a = l_arr[i_a];
for (i_b = i_a + 2; i_b < f_len; i_b++) {
BMLoop *l_b = l_arr[i_b];
/* check these are not touching
* (we could be smarter here) */
if (!BM_loop_is_adjacent(l_a, l_b)) {
/* first calculate normals */
float no_a[3], no_b[3];
if (BM_face_calc_normal_subset(l_a, l_b, no_a) != 0.0f &&
BM_face_calc_normal_subset(l_b, l_a, no_b) != 0.0f) {
const float err_a = bm_face_subset_calc_planar(l_a, l_b, no_a);
const float err_b = bm_face_subset_calc_planar(l_b, l_a, no_b);
const float err_test = err_a + err_b;
if (err_test < err_best) {
/* check we're legal (we could batch this) */
BMLoop *l_split[2] = {l_a, l_b};
BM_face_splits_check_legal(bm, f, &l_split, 1);
if (l_split[0]) {
err_best = err_test;
l_pair[0] = l_a;
l_pair[1] = l_b;
angle_best_cos = dot_v3v3(no_a, no_b);
found = true;
}
}
}
}
}
}
*r_angle_cos = angle_best_cos;
return found;
}
static bool bm_face_split_by_angle(BMesh *bm,
BMFace *f,
BMFace *r_f_pair[2],
const float angle_limit_cos)
{
BMLoop *l_pair[2];
float angle_cos;
if (bm_face_split_find(bm, f, l_pair, &angle_cos) && (angle_cos < angle_limit_cos)) {
BMFace *f_new;
BMLoop *l_new;
f_new = BM_face_split(bm, f, l_pair[0], l_pair[1], &l_new, NULL, false);
if (f_new) {
r_f_pair[0] = f;
r_f_pair[1] = f_new;
BMO_face_flag_enable(bm, f, FACE_OUT);
BMO_face_flag_enable(bm, f_new, FACE_OUT);
BMO_edge_flag_enable(bm, l_new->e, EDGE_OUT);
return true;
}
}
return false;
}
void bmo_connect_verts_nonplanar_exec(BMesh *bm, BMOperator *op)
{
BMOIter siter;
BMFace *f;
bool changed = false;
BLI_LINKSTACK_DECLARE(fstack, BMFace *);
const float angle_limit_cos = cosf(BMO_slot_float_get(op->slots_in, "angle_limit"));
BLI_LINKSTACK_INIT(fstack);
BMO_ITER (f, &siter, op->slots_in, "faces", BM_FACE) {
if (f->len > 3) {
BLI_LINKSTACK_PUSH(fstack, f);
}
}
while ((f = BLI_LINKSTACK_POP(fstack))) {
BMFace *f_pair[2];
if (bm_face_split_by_angle(bm, f, f_pair, angle_limit_cos)) {
int j;
for (j = 0; j < 2; j++) {
BM_face_normal_update(f_pair[j]);
if (f_pair[j]->len > 3) {
BLI_LINKSTACK_PUSH(fstack, f_pair[j]);
}
}
changed = true;
}
}
BLI_LINKSTACK_FREE(fstack);
if (changed) {
BMO_slot_buffer_from_enabled_flag(bm, op, op->slots_out, "edges.out", BM_EDGE, EDGE_OUT);
BMO_slot_buffer_from_enabled_flag(bm, op, op->slots_out, "faces.out", BM_FACE, FACE_OUT);
}
}
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