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blender-archive/source/blender/editors/mesh/editmesh_intersect.c

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/*
* 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.
*/
/** \file
* \ingroup edmesh
*/
#include "MEM_guardedalloc.h"
#include "DNA_object_types.h"
#include "BLI_buffer.h"
#include "BLI_linklist_stack.h"
#include "BLI_math.h"
#include "BLI_memarena.h"
#include "BLI_stack.h"
#include "BKE_context.h"
#include "BKE_editmesh.h"
#include "BKE_editmesh_bvh.h"
#include "BKE_layer.h"
#include "BKE_report.h"
#include "RNA_access.h"
#include "RNA_define.h"
#include "WM_types.h"
#include "ED_mesh.h"
#include "ED_screen.h"
#include "intern/bmesh_private.h"
#include "mesh_intern.h" /* own include */
#include "tools/bmesh_intersect.h"
#include "tools/bmesh_separate.h"
/* detect isolated holes and fill them */
#define USE_NET_ISLAND_CONNECT
/**
* Compare selected with its self.
*/
static int bm_face_isect_self(BMFace *f, void *UNUSED(user_data))
{
if (BM_elem_flag_test(f, BM_ELEM_SELECT)) {
return 0;
}
else {
return -1;
}
}
/**
* Compare selected/unselected.
*/
static int bm_face_isect_pair(BMFace *f, void *UNUSED(user_data))
{
if (BM_elem_flag_test(f, BM_ELEM_HIDDEN)) {
return -1;
}
else if (BM_elem_flag_test(f, BM_ELEM_SELECT)) {
return 1;
}
else {
return 0;
}
}
/**
* A flipped version of #bm_face_isect_pair
* use for boolean 'difference', which depends on order.
*/
static int bm_face_isect_pair_swap(BMFace *f, void *UNUSED(user_data))
{
if (BM_elem_flag_test(f, BM_ELEM_HIDDEN)) {
return -1;
}
else if (BM_elem_flag_test(f, BM_ELEM_SELECT)) {
return 0;
}
else {
return 1;
}
}
/**
* Use for intersect and boolean.
*/
static void edbm_intersect_select(BMEditMesh *em, struct Mesh *me, bool do_select)
{
if (do_select) {
BM_mesh_elem_hflag_disable_all(em->bm, BM_VERT | BM_EDGE | BM_FACE, BM_ELEM_SELECT, false);
if (em->bm->selectmode & (SCE_SELECT_VERTEX | SCE_SELECT_EDGE)) {
BMIter iter;
BMEdge *e;
BM_ITER_MESH (e, &iter, em->bm, BM_EDGES_OF_MESH) {
if (BM_elem_flag_test(e, BM_ELEM_TAG)) {
BM_edge_select_set(em->bm, e, true);
}
}
}
}
EDBM_mesh_normals_update(em);
EDBM_update_generic(me, true, true);
}
/* -------------------------------------------------------------------- */
/* Cut intersections into geometry */
/** \name Simple Intersect (self-intersect)
* \{
*/
enum {
ISECT_SEL = 0,
ISECT_SEL_UNSEL = 1,
};
enum {
ISECT_SEPARATE_ALL = 0,
ISECT_SEPARATE_CUT = 1,
ISECT_SEPARATE_NONE = 2,
};
static int edbm_intersect_exec(bContext *C, wmOperator *op)
{
const int mode = RNA_enum_get(op->ptr, "mode");
int (*test_fn)(BMFace *, void *);
bool use_separate_all = false;
bool use_separate_cut = false;
const int separate_mode = RNA_enum_get(op->ptr, "separate_mode");
const float eps = RNA_float_get(op->ptr, "threshold");
bool use_self;
bool has_isect;
switch (mode) {
case ISECT_SEL:
test_fn = bm_face_isect_self;
use_self = true;
break;
default: /* ISECT_SEL_UNSEL */
test_fn = bm_face_isect_pair;
use_self = false;
break;
}
switch (separate_mode) {
case ISECT_SEPARATE_ALL:
use_separate_all = true;
break;
case ISECT_SEPARATE_CUT:
if (use_self == false) {
use_separate_cut = true;
}
else {
/* we could support this but would require more advanced logic inside 'BM_mesh_intersect'
* for now just separate all */
use_separate_all = true;
}
break;
default: /* ISECT_SEPARATE_NONE */
break;
}
ViewLayer *view_layer = CTX_data_view_layer(C);
uint objects_len = 0;
uint isect_len = 0;
Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
view_layer, CTX_wm_view3d(C), &objects_len);
for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
Object *obedit = objects[ob_index];
BMEditMesh *em = BKE_editmesh_from_object(obedit);
if (em->bm->totfacesel == 0) {
continue;
}
has_isect = BM_mesh_intersect(em->bm,
em->looptris,
em->tottri,
test_fn,
NULL,
use_self,
use_separate_all,
true,
true,
true,
true,
-1,
eps);
if (use_separate_cut) {
/* detach selected/un-selected faces */
BM_mesh_separate_faces(
em->bm, BM_elem_cb_check_hflag_enabled_simple(const BMFace *, BM_ELEM_SELECT));
}
edbm_intersect_select(em, obedit->data, has_isect);
if (!has_isect) {
isect_len++;
}
}
MEM_freeN(objects);
if (isect_len == objects_len) {
BKE_report(op->reports, RPT_WARNING, "No intersections found");
}
return OPERATOR_FINISHED;
}
void MESH_OT_intersect(struct wmOperatorType *ot)
{
static const EnumPropertyItem isect_mode_items[] = {
{ISECT_SEL, "SELECT", 0, "Self Intersect", "Self intersect selected faces"},
{ISECT_SEL_UNSEL,
"SELECT_UNSELECT",
0,
"Selected/Unselected",
"Intersect selected with unselected faces"},
{0, NULL, 0, NULL, NULL},
};
static const EnumPropertyItem isect_separate_items[] = {
{ISECT_SEPARATE_ALL, "ALL", 0, "All", "Separate all geometry from intersections"},
{ISECT_SEPARATE_CUT,
"CUT",
0,
"Cut",
"Cut into geometry keeping each side separate (Selected/Unselected only)"},
{ISECT_SEPARATE_NONE, "NONE", 0, "Merge", "Merge all geometry from the intersection"},
{0, NULL, 0, NULL, NULL},
};
/* identifiers */
ot->name = "Intersect (Knife)";
ot->description = "Cut an intersection into faces";
ot->idname = "MESH_OT_intersect";
/* api callbacks */
ot->exec = edbm_intersect_exec;
ot->poll = ED_operator_editmesh;
/* props */
RNA_def_enum(ot->srna, "mode", isect_mode_items, ISECT_SEL_UNSEL, "Source", "");
RNA_def_enum(
ot->srna, "separate_mode", isect_separate_items, ISECT_SEPARATE_CUT, "Separate Mode", "");
RNA_def_float_distance(
ot->srna, "threshold", 0.000001f, 0.0, 0.01, "Merge threshold", "", 0.0, 0.001);
/* flags */
ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}
/** \} */
/* -------------------------------------------------------------------- */
/* Boolean (a kind of intersect) */
/** \name Boolean Intersect
*
* \note internally this is nearly exactly the same as 'MESH_OT_intersect',
* however from a user perspective they are quite different, so expose as different tools.
*
* \{
*/
static int edbm_intersect_boolean_exec(bContext *C, wmOperator *op)
{
const int boolean_operation = RNA_enum_get(op->ptr, "operation");
bool use_swap = RNA_boolean_get(op->ptr, "use_swap");
const float eps = RNA_float_get(op->ptr, "threshold");
int (*test_fn)(BMFace *, void *);
bool has_isect;
test_fn = use_swap ? bm_face_isect_pair_swap : bm_face_isect_pair;
ViewLayer *view_layer = CTX_data_view_layer(C);
uint objects_len = 0;
uint isect_len = 0;
Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
view_layer, CTX_wm_view3d(C), &objects_len);
for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
Object *obedit = objects[ob_index];
BMEditMesh *em = BKE_editmesh_from_object(obedit);
if (em->bm->totfacesel == 0) {
continue;
}
has_isect = BM_mesh_intersect(em->bm,
em->looptris,
em->tottri,
test_fn,
NULL,
false,
false,
true,
true,
false,
true,
boolean_operation,
eps);
edbm_intersect_select(em, obedit->data, has_isect);
if (!has_isect) {
isect_len++;
}
}
MEM_freeN(objects);
if (isect_len == objects_len) {
BKE_report(op->reports, RPT_WARNING, "No intersections found");
}
return OPERATOR_FINISHED;
}
void MESH_OT_intersect_boolean(struct wmOperatorType *ot)
{
static const EnumPropertyItem isect_boolean_operation_items[] = {
{BMESH_ISECT_BOOLEAN_ISECT, "INTERSECT", 0, "Intersect", ""},
{BMESH_ISECT_BOOLEAN_UNION, "UNION", 0, "Union", ""},
{BMESH_ISECT_BOOLEAN_DIFFERENCE, "DIFFERENCE", 0, "Difference", ""},
{0, NULL, 0, NULL, NULL},
};
/* identifiers */
ot->name = "Intersect (Boolean)";
ot->description = "Cut solid geometry from selected to unselected";
ot->idname = "MESH_OT_intersect_boolean";
/* api callbacks */
ot->exec = edbm_intersect_boolean_exec;
ot->poll = ED_operator_editmesh;
/* props */
RNA_def_enum(ot->srna,
"operation",
isect_boolean_operation_items,
BMESH_ISECT_BOOLEAN_DIFFERENCE,
"Boolean",
"");
RNA_def_boolean(ot->srna,
"use_swap",
false,
"Swap",
"Use with difference intersection to swap which side is kept");
RNA_def_float_distance(
ot->srna, "threshold", 0.000001f, 0.0, 0.01, "Merge threshold", "", 0.0, 0.001);
/* flags */
ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}
/** \} */
/* -------------------------------------------------------------------- */
/* Face Split by Edges */
/** \name Face/Edge Split
* \{ */
static void bm_face_split_by_edges(BMesh *bm,
BMFace *f,
const char hflag,
/* reusable memory buffer */
BLI_Buffer *edge_net_temp_buf)
{
const int f_index = BM_elem_index_get(f);
BMLoop *l_iter;
BMLoop *l_first;
BMVert *v;
BMFace **face_arr;
int face_arr_len;
/* likely this will stay very small
* all verts pushed into this stack _must_ have their previous edges set! */
BLI_SMALLSTACK_DECLARE(vert_stack, BMVert *);
BLI_SMALLSTACK_DECLARE(vert_stack_next, BMVert *);
BLI_assert(edge_net_temp_buf->count == 0);
/* collect all edges */
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
BMIter iter;
BMEdge *e;
BM_ITER_ELEM (e, &iter, l_iter->v, BM_EDGES_OF_VERT) {
if (BM_elem_flag_test(e, hflag) && (BM_elem_index_get(e) == f_index)) {
v = BM_edge_other_vert(e, l_iter->v);
v->e = e;
BLI_SMALLSTACK_PUSH(vert_stack, v);
BLI_buffer_append(edge_net_temp_buf, BMEdge *, e);
}
}
} while ((l_iter = l_iter->next) != l_first);
/* now assign all */
/* pop free values into the next stack */
while ((v = BLI_SMALLSTACK_POP_EX(vert_stack, vert_stack_next))) {
BMIter eiter;
BMEdge *e_next;
BM_ITER_ELEM (e_next, &eiter, v, BM_EDGES_OF_VERT) {
if (BM_elem_flag_test(e_next, hflag) && (BM_elem_index_get(e_next) == -1)) {
BMVert *v_next;
v_next = BM_edge_other_vert(e_next, v);
BM_elem_index_set(e_next, f_index);
BLI_SMALLSTACK_PUSH(vert_stack_next, v_next);
BLI_buffer_append(edge_net_temp_buf, BMEdge *, e_next);
}
}
if (BLI_SMALLSTACK_IS_EMPTY(vert_stack)) {
BLI_SMALLSTACK_SWAP(vert_stack, vert_stack_next);
}
}
BM_face_split_edgenet(
bm, f, edge_net_temp_buf->data, edge_net_temp_buf->count, &face_arr, &face_arr_len);
BLI_buffer_clear(edge_net_temp_buf);
if (face_arr_len) {
int i;
for (i = 0; i < face_arr_len; i++) {
BM_face_select_set(bm, face_arr[i], true);
BM_elem_flag_disable(face_arr[i], hflag);
}
}
if (face_arr) {
MEM_freeN(face_arr);
}
}
/**
* Check if a vert is in any of the faces connected to the edge,
* \a f_ignore is a face we happen to know isn't shared by the vertex.
*/
static bool bm_vert_in_faces_radial(BMVert *v, BMEdge *e_radial, BMFace *f_ignore)
{
BLI_assert(BM_vert_in_face(v, f_ignore) == false);
if (e_radial->l) {
BMLoop *l_iter = e_radial->l;
do {
if (l_iter->f != f_ignore) {
if (BM_vert_in_face(v, l_iter->f)) {
return true;
}
}
} while ((l_iter = l_iter->radial_next) != e_radial->l);
}
return false;
}
#ifdef USE_NET_ISLAND_CONNECT
struct LinkBase {
LinkNode *list;
uint list_len;
};
static void ghash_insert_face_edge_link(GHash *gh,
BMFace *f_key,
BMEdge *e_val,
MemArena *mem_arena)
{
void **ls_base_p;
struct LinkBase *ls_base;
LinkNode *ls;
if (!BLI_ghash_ensure_p(gh, f_key, &ls_base_p)) {
ls_base = *ls_base_p = BLI_memarena_alloc(mem_arena, sizeof(*ls_base));
ls_base->list = NULL;
ls_base->list_len = 0;
}
else {
ls_base = *ls_base_p;
}
ls = BLI_memarena_alloc(mem_arena, sizeof(*ls));
ls->next = ls_base->list;
ls->link = e_val;
ls_base->list = ls;
ls_base->list_len += 1;
}
static int bm_edge_sort_length_cb(const void *e_a_v, const void *e_b_v)
{
const float val_a = -BM_edge_calc_length_squared(*((BMEdge **)e_a_v));
const float val_b = -BM_edge_calc_length_squared(*((BMEdge **)e_b_v));
if (val_a > val_b) {
return 1;
}
else if (val_a < val_b) {
return -1;
}
else {
return 0;
}
}
static void bm_face_split_by_edges_island_connect(
BMesh *bm, BMFace *f, LinkNode *e_link, const int e_link_len, MemArena *mem_arena_edgenet)
{
BMEdge **edge_arr = BLI_memarena_alloc(mem_arena_edgenet, sizeof(*edge_arr) * e_link_len);
int edge_arr_len = 0;
while (e_link) {
edge_arr[edge_arr_len++] = e_link->link;
e_link = e_link->next;
}
{
uint edge_arr_holes_len;
BMEdge **edge_arr_holes;
if (BM_face_split_edgenet_connect_islands(bm,
f,
edge_arr,
e_link_len,
true,
mem_arena_edgenet,
&edge_arr_holes,
&edge_arr_holes_len)) {
edge_arr_len = edge_arr_holes_len;
edge_arr = edge_arr_holes; /* owned by the arena */
}
}
BM_face_split_edgenet(bm, f, edge_arr, edge_arr_len, NULL, NULL);
for (int i = e_link_len; i < edge_arr_len; i++) {
BM_edge_select_set(bm, edge_arr[i], true);
}
if (e_link_len != edge_arr_len) {
/* connecting partial islands can add redundant edges
* sort before removal to give deterministic outcome */
qsort(edge_arr, edge_arr_len - e_link_len, sizeof(*edge_arr), bm_edge_sort_length_cb);
for (int i = e_link_len; i < edge_arr_len; i++) {
BMFace *f_pair[2];
if (BM_edge_face_pair(edge_arr[i], &f_pair[0], &f_pair[1])) {
if (BM_face_share_vert_count(f_pair[0], f_pair[1]) == 2) {
BMFace *f_new = BM_faces_join(bm, f_pair, 2, true);
if (f_new) {
BM_face_select_set(bm, f_new, true);
}
}
}
}
}
}
/**
* Check if \a v_pivot should be spliced into an existing edge.
*
* Detect one of 3 cases:
*
* - \a v_pivot is shared by 2+ edges from different faces.
* in this case return the closest edge shared by all faces.
*
* - \a v_pivot is an end-point of an edge which has no other edges connected.
* in this case return the closest edge in \a f_a to the \a v_pivot.
*
* - \a v_pivot has only edges from the same face connected,
* in this case return NULL. This is the most common case - no action is needed.
*
* \return the edge to be split.
*
* \note Currently we don't snap to verts or split chains by verts on-edges.
*/
static BMEdge *bm_face_split_edge_find(BMEdge *e_a,
BMFace *f_a,
BMVert *v_pivot,
BMFace **ftable,
const int ftable_len,
float r_v_pivot_co[3],
float *r_v_pivot_fac)
{
const int f_a_index = BM_elem_index_get(e_a);
bool found_other_self = false;
int found_other_face = 0;
BLI_SMALLSTACK_DECLARE(face_stack, BMFace *);
/* loop over surrounding edges to check if we're part of a chain or a delimiter vertex */
BMEdge *e_b = v_pivot->e;
do {
if (e_b != e_a) {
const int f_b_index = BM_elem_index_get(e_b);
if (f_b_index == f_a_index) {
/* not an endpoint */
found_other_self = true;
}
else if (f_b_index != -1) {
BLI_assert(f_b_index < ftable_len);
UNUSED_VARS_NDEBUG(ftable_len);
/* 'v_pivot' spans 2+ faces,
* tag to ensure we pick an edge that includes this face */
BMFace *f_b = ftable[f_b_index];
if (!BM_elem_flag_test(f_b, BM_ELEM_INTERNAL_TAG)) {
BM_elem_flag_enable(f_b, BM_ELEM_INTERNAL_TAG);
BLI_SMALLSTACK_PUSH(face_stack, f_b);
found_other_face++;
}
}
}
} while ((e_b = BM_DISK_EDGE_NEXT(e_b, v_pivot)) != v_pivot->e);
BMEdge *e_split = NULL;
/* if we have no others or the other edge is outside this face,
* we're an endpoint to connect to a boundary */
if ((found_other_self == false) || found_other_face) {
BMLoop *l_iter, *l_first;
l_iter = l_first = BM_FACE_FIRST_LOOP(f_a);
float dist_best_sq = FLT_MAX;
do {
float v_pivot_co_test[3];
float v_pivot_fac = line_point_factor_v3(v_pivot->co, l_iter->e->v1->co, l_iter->e->v2->co);
CLAMP(v_pivot_fac, 0.0f, 1.0f);
interp_v3_v3v3(v_pivot_co_test, l_iter->e->v1->co, l_iter->e->v2->co, v_pivot_fac);
float dist_test_sq = len_squared_v3v3(v_pivot_co_test, v_pivot->co);
if ((dist_test_sq < dist_best_sq) || (e_split == NULL)) {
bool ok = true;
if (UNLIKELY(BM_edge_exists(v_pivot, l_iter->e->v1) ||
BM_edge_exists(v_pivot, l_iter->e->v2))) {
/* very unlikely but will cause complications splicing the verts together,
* so just skip this case */
ok = false;
}
else if (found_other_face) {
/* double check that _all_ the faces used by v_pivot's edges are attached
* to this edge otherwise don't attempt the split since it will give
* non-deterministic results */
BMLoop *l_radial_iter = l_iter->radial_next;
int other_face_shared = 0;
if (l_radial_iter != l_iter) {
do {
if (BM_elem_flag_test(l_radial_iter->f, BM_ELEM_INTERNAL_TAG)) {
other_face_shared++;
}
} while ((l_radial_iter = l_radial_iter->radial_next) != l_iter);
}
if (other_face_shared != found_other_face) {
ok = false;
}
}
if (ok) {
e_split = l_iter->e;
dist_best_sq = dist_test_sq;
copy_v3_v3(r_v_pivot_co, v_pivot_co_test);
*r_v_pivot_fac = v_pivot_fac;
}
}
} while ((l_iter = l_iter->next) != l_first);
}
{
/* reset the flag, for future use */
BMFace *f;
while ((f = BLI_SMALLSTACK_POP(face_stack))) {
BM_elem_flag_disable(f, BM_ELEM_INTERNAL_TAG);
}
}
return e_split;
}
#endif /* USE_NET_ISLAND_CONNECT */
static int edbm_face_split_by_edges_exec(bContext *C, wmOperator *UNUSED(op))
{
const char hflag = BM_ELEM_TAG;
BMEdge *e;
BMIter iter;
ViewLayer *view_layer = CTX_data_view_layer(C);
uint objects_len = 0;
Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
view_layer, CTX_wm_view3d(C), &objects_len);
for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
Object *obedit = objects[ob_index];
BMEditMesh *em = BKE_editmesh_from_object(obedit);
BMesh *bm = em->bm;
if ((bm->totedgesel == 0) || (bm->totfacesel == 0)) {
continue;
}
BLI_SMALLSTACK_DECLARE(loop_stack, BMLoop *);
{
BMVert *v;
BM_ITER_MESH (v, &iter, bm, BM_VERTS_OF_MESH) {
BM_elem_flag_disable(v, hflag);
}
}
/* edge index is set to -1 then used to associate them with faces */
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
if (BM_elem_flag_test(e, BM_ELEM_SELECT) && BM_edge_is_wire(e)) {
BM_elem_flag_enable(e, hflag);
BM_elem_flag_enable(e->v1, hflag);
BM_elem_flag_enable(e->v2, hflag);
}
else {
BM_elem_flag_disable(e, hflag);
}
BM_elem_index_set(e, -1); /* set_dirty */
}
bm->elem_index_dirty |= BM_EDGE;
{
BMFace *f;
int i;
BM_ITER_MESH_INDEX (f, &iter, bm, BM_FACES_OF_MESH, i) {
if (BM_elem_flag_test(f, BM_ELEM_SELECT)) {
BM_elem_flag_enable(f, hflag);
}
else {
BM_elem_flag_disable(f, hflag);
}
BM_elem_flag_disable(f, BM_ELEM_INTERNAL_TAG);
BM_elem_index_set(f, i); /* set_ok */
}
}
bm->elem_index_dirty &= ~BM_FACE;
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
if (BM_elem_flag_test(e, hflag)) {
BMIter viter;
BMVert *v;
BM_ITER_ELEM (v, &viter, e, BM_VERTS_OF_EDGE) {
BMIter liter;
BMLoop *l;
uint loop_stack_len;
BMLoop *l_best = NULL;
BLI_assert(BLI_SMALLSTACK_IS_EMPTY(loop_stack));
loop_stack_len = 0;
BM_ITER_ELEM (l, &liter, v, BM_LOOPS_OF_VERT) {
if (BM_elem_flag_test(l->f, hflag)) {
BLI_SMALLSTACK_PUSH(loop_stack, l);
loop_stack_len++;
}
}
if (loop_stack_len == 0) {
/* pass */
}
else if (loop_stack_len == 1) {
l_best = BLI_SMALLSTACK_POP(loop_stack);
}
else {
/* complicated case, match the edge with a face-loop */
BMVert *v_other = BM_edge_other_vert(e, v);
float e_dir[3];
/* we want closest to zero */
float dot_best = FLT_MAX;
sub_v3_v3v3(e_dir, v_other->co, v->co);
normalize_v3(e_dir);
while ((l = BLI_SMALLSTACK_POP(loop_stack))) {
float dot_test;
/* Check dot first to save on expensive angle-comparison.
* ideal case is 90d difference == 0.0 dot */
dot_test = fabsf(dot_v3v3(e_dir, l->f->no));
if (dot_test < dot_best) {
/* check we're in the correct corner
* (works with convex loops too) */
if (angle_signed_on_axis_v3v3v3_v3(
l->prev->v->co, l->v->co, v_other->co, l->f->no) <
angle_signed_on_axis_v3v3v3_v3(
l->prev->v->co, l->v->co, l->next->v->co, l->f->no)) {
dot_best = dot_test;
l_best = l;
}
}
}
}
if (l_best) {
BM_elem_index_set(e, BM_elem_index_get(l_best->f)); /* set_dirty */
}
}
}
}
{
BMFace *f;
BLI_buffer_declare_static(BMEdge **, edge_net_temp_buf, 0, 128);
BM_ITER_MESH (f, &iter, bm, BM_FACES_OF_MESH) {
if (BM_elem_flag_test(f, hflag)) {
bm_face_split_by_edges(bm, f, hflag, &edge_net_temp_buf);
}
}
BLI_buffer_free(&edge_net_temp_buf);
}
#ifdef USE_NET_ISLAND_CONNECT
/* before overwriting edge index values, collect edges left untouched */
BLI_Stack *edges_loose = BLI_stack_new(sizeof(BMEdge *), __func__);
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
if (BM_elem_flag_test(e, BM_ELEM_SELECT) && BM_edge_is_wire(e)) {
BLI_stack_push(edges_loose, &e);
}
}
#endif
EDBM_mesh_normals_update(em);
EDBM_update_generic(obedit->data, true, true);
#ifdef USE_NET_ISLAND_CONNECT
/* we may have remaining isolated regions remaining,
* these will need to have connecting edges created */
if (!BLI_stack_is_empty(edges_loose)) {
GHash *face_edge_map = BLI_ghash_ptr_new(__func__);
MemArena *mem_arena = BLI_memarena_new(BLI_MEMARENA_STD_BUFSIZE, __func__);
BM_mesh_elem_index_ensure(bm, BM_FACE);
{
BMBVHTree *bmbvh = BKE_bmbvh_new(
bm, em->looptris, em->tottri, BMBVH_RESPECT_SELECT, NULL, false);
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
BM_elem_index_set(e, -1); /* set_dirty */
}
while (!BLI_stack_is_empty(edges_loose)) {
BLI_stack_pop(edges_loose, &e);
float e_center[3];
mid_v3_v3v3(e_center, e->v1->co, e->v2->co);
BMFace *f = BKE_bmbvh_find_face_closest(bmbvh, e_center, FLT_MAX);
if (f) {
ghash_insert_face_edge_link(face_edge_map, f, e, mem_arena);
BM_elem_index_set(e, BM_elem_index_get(f)); /* set_dirty */
}
}
BKE_bmbvh_free(bmbvh);
}
bm->elem_index_dirty |= BM_EDGE;
BM_mesh_elem_table_ensure(bm, BM_FACE);
/* detect edges chains that span faces
* and splice vertices into the closest edges */
{
GHashIterator gh_iter;
GHASH_ITER (gh_iter, face_edge_map) {
BMFace *f = BLI_ghashIterator_getKey(&gh_iter);
struct LinkBase *e_ls_base = BLI_ghashIterator_getValue(&gh_iter);
LinkNode *e_link = e_ls_base->list;
do {
e = e_link->link;
for (int j = 0; j < 2; j++) {
BMVert *v_pivot = (&e->v1)[j];
/* checking that \a v_pivot isn't in the face prevents attempting
* to splice the same vertex into an edge from multiple faces */
if (!BM_vert_in_face(v_pivot, f)) {
float v_pivot_co[3];
float v_pivot_fac;
BMEdge *e_split = bm_face_split_edge_find(
e, f, v_pivot, bm->ftable, bm->totface, v_pivot_co, &v_pivot_fac);
if (e_split) {
/* for degenerate cases this vertex may be in one
* of this edges radial faces */
if (!bm_vert_in_faces_radial(v_pivot, e_split, f)) {
BMEdge *e_new;
BMVert *v_new = BM_edge_split(bm, e_split, e_split->v1, &e_new, v_pivot_fac);
if (v_new) {
/* we _know_ these don't share an edge */
BM_vert_splice(bm, v_pivot, v_new);
BM_elem_index_set(e_new, BM_elem_index_get(e_split));
}
}
}
}
}
} while ((e_link = e_link->next));
}
}
{
MemArena *mem_arena_edgenet = BLI_memarena_new(BLI_MEMARENA_STD_BUFSIZE, __func__);
GHashIterator gh_iter;
GHASH_ITER (gh_iter, face_edge_map) {
BMFace *f = BLI_ghashIterator_getKey(&gh_iter);
struct LinkBase *e_ls_base = BLI_ghashIterator_getValue(&gh_iter);
bm_face_split_by_edges_island_connect(
bm, f, e_ls_base->list, e_ls_base->list_len, mem_arena_edgenet);
BLI_memarena_clear(mem_arena_edgenet);
}
BLI_memarena_free(mem_arena_edgenet);
}
BLI_memarena_free(mem_arena);
BLI_ghash_free(face_edge_map, NULL, NULL);
EDBM_mesh_normals_update(em);
EDBM_update_generic(obedit->data, true, true);
}
BLI_stack_free(edges_loose);
#endif /* USE_NET_ISLAND_CONNECT */
}
MEM_freeN(objects);
return OPERATOR_FINISHED;
}
void MESH_OT_face_split_by_edges(struct wmOperatorType *ot)
{
/* identifiers */
ot->name = "Weld Edges into Faces";
ot->description = "Weld loose edges into faces (splitting them into new faces)";
ot->idname = "MESH_OT_face_split_by_edges";
/* api callbacks */
ot->exec = edbm_face_split_by_edges_exec;
ot->poll = ED_operator_editmesh;
/* flags */
ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}
/** \} */
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