Added ability to harden normals.

Uses 2 different params: mode and strength. There are still some
hiccups with how 2.8 interacts with normals. Will resolve as
support gets better
This commit is contained in:
Rohan Rathi 2018-06-11 11:58:26 +05:30
parent 18a8bb5c16
commit 0c6410ec0c
12 changed files with 258 additions and 47 deletions

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@ -1225,6 +1225,41 @@ void BM_lnorspace_update(BMesh *bm)
}
}
void BM_normals_loops_edges_tag(BMesh *bm, const bool do_edges)
{
BMFace *f;
BMEdge *e;
BMIter fiter, eiter;
BMLoop *l_curr, *l_first;
if (do_edges) {
int index_edge;
BM_ITER_MESH_INDEX(e, &eiter, bm, BM_EDGES_OF_MESH, index_edge) {
BMLoop *l_a, *l_b;
BM_elem_index_set(e, index_edge); /* set_inline */
BM_elem_flag_disable(e, BM_ELEM_TAG);
if (BM_edge_loop_pair(e, &l_a, &l_b)) {
if (BM_elem_flag_test(e, BM_ELEM_SMOOTH) && l_a->v != l_b->v) {
BM_elem_flag_enable(e, BM_ELEM_TAG);
}
}
}
bm->elem_index_dirty &= ~BM_EDGE;
}
int index_face, index_loop = 0;
BM_ITER_MESH_INDEX(f, &fiter, bm, BM_FACES_OF_MESH, index_face) {
BM_elem_index_set(f, index_face); /* set_inline */
l_curr = l_first = BM_FACE_FIRST_LOOP(f);
do {
BM_elem_index_set(l_curr, index_loop++); /* set_inline */
BM_elem_flag_disable(l_curr, BM_ELEM_TAG);
} while ((l_curr = l_curr->next) != l_first);
}
bm->elem_index_dirty &= ~(BM_FACE | BM_LOOP);
}
/**
* Auxillary function only used by rebuild to detect if any spaces were not marked as invalid.
* Reports error if any of the lnor spaces change after rebuilding, meaning that all the possible

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@ -59,6 +59,7 @@ void BM_lnorspacearr_store(BMesh *bm, float(*r_lnors)[3]);
void BM_lnorspace_invalidate(BMesh *bm, const bool do_invalidate_all);
void BM_lnorspace_rebuild(BMesh *bm, bool preserve_clnor);
void BM_lnorspace_update(BMesh *bm);
void BM_normals_loops_edges_tag(BMesh *bm, const bool do_edges);
#ifndef NDEBUG
void BM_lnorspace_err(BMesh *bm);
#endif

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@ -1738,12 +1738,15 @@ static BMOpDefine bmo_bevel_def = {
{"loop_slide", BMO_OP_SLOT_BOOL}, /* prefer to slide along edges to having even widths */
{"mark_seam", BMO_OP_SLOT_BOOL},
{"mark_sharp", BMO_OP_SLOT_BOOL},
{"strength", BMO_OP_SLOT_FLT},
{"hnmode", BMO_OP_SLOT_INT},
{{'\0'}},
},
/* slots_out */
{{"faces.out", BMO_OP_SLOT_ELEMENT_BUF, {BM_FACE}}, /* output faces */
{"edges.out", BMO_OP_SLOT_ELEMENT_BUF, {BM_EDGE}}, /* output edges */
{"verts.out", BMO_OP_SLOT_ELEMENT_BUF, {BM_VERT}}, /* output verts */
{"normals.out", BMO_OP_SLOT_MAPPING},
{{'\0'}},
},

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@ -127,6 +127,11 @@ enum {
BEVEL_AMT_PERCENT
};
enum {
BEVEL_HN_FACE,
BEVEL_HN_ADJ,
};
extern const BMOpDefine *bmo_opdefines[];
extern const int bmo_opdefines_total;

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@ -45,6 +45,7 @@ void bmo_bevel_exec(BMesh *bm, BMOperator *op)
const bool loop_slide = BMO_slot_bool_get(op->slots_in, "loop_slide");
const bool mark_seam = BMO_slot_bool_get(op->slots_in, "mark_seam");
const bool mark_sharp = BMO_slot_bool_get(op->slots_in, "mark_sharp");
const int hnmode = BMO_slot_int_get(op->slots_in, "hnmode");
if (offset > 0) {
BMOIter siter;
@ -65,7 +66,7 @@ void bmo_bevel_exec(BMesh *bm, BMOperator *op)
}
}
BM_mesh_bevel(bm, offset, offset_type, seg, profile, vonly, false, clamp_overlap, NULL, -1, material, loop_slide, mark_seam, mark_sharp);
BM_mesh_bevel(bm, offset, offset_type, seg, profile, vonly, false, clamp_overlap, NULL, -1, material, loop_slide, mark_seam, mark_sharp, 0/*hnmode*/, op);
BMO_slot_buffer_from_enabled_hflag(bm, op, op->slots_out, "faces.out", BM_FACE, BM_ELEM_TAG);
BMO_slot_buffer_from_enabled_hflag(bm, op, op->slots_out, "edges.out", BM_EDGE, BM_ELEM_TAG);

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@ -37,6 +37,7 @@
#include "BLI_array.h"
#include "BLI_alloca.h"
#include "BLI_bitmap.h"
#include "BLI_gsqueue.h"
#include "BLI_math.h"
#include "BLI_memarena.h"
@ -207,6 +208,7 @@ typedef struct BevelParams {
const struct MDeformVert *dvert; /* vertex group array, maybe set if vertex_only */
int vertex_group; /* vertex group index, maybe set if vertex_only */
int mat_nr; /* if >= 0, material number for bevel; else material comes from adjacent faces */
int hnmode;
} BevelParams;
// #pragma GCC diagnostic ignored "-Wpadded"
@ -1648,6 +1650,76 @@ static void bevel_extend_edge_data(BevVert *bv)
} while (bcur != start);
}
static void bevel_harden_normals_mode(BMesh *bm, BevelParams *bp, BevVert *bv, BMOperator *op)
{
int mode = 1;
VMesh *vm = bv->vmesh;
BoundVert *bcur = vm->boundstart, *bstart = bcur;
int ns = vm->seg, ns2 = ns / 2;
BMEdge *e;
BMIter eiter;
BMOpSlot *nslot = BMO_slot_get(op->slots_out, "normals.out");
float n_final[3] = { 0.0f, 0.0f, 0.0f };
if (bp->hnmode == BEVEL_HN_FACE) {
BLI_bitmap *faces = BLI_BITMAP_NEW(bm->totface, __func__);
BM_ITER_ELEM(e, &eiter, bv->v, BM_EDGES_OF_VERT) {
if (BM_elem_flag_test(e, BM_ELEM_TAG)) {
BMFace *f_a, *f_b;
BM_edge_face_pair(e, &f_a, &f_b);
if (f_a && !BLI_BITMAP_TEST(faces, BM_elem_index_get(f_a))) {
int f_area = BM_face_calc_area(f_a);
float f_no[3];
copy_v3_v3(f_no, f_a->no);
mul_v3_fl(f_no, f_area);
add_v3_v3(n_final, f_no);
BLI_BITMAP_ENABLE(faces, BM_elem_index_get(f_a));
}
if (f_b && !BLI_BITMAP_TEST(faces, BM_elem_index_get(f_b))) {
int f_area = BM_face_calc_area(f_b);
float f_no[3];
copy_v3_v3(f_no, f_b->no);
mul_v3_fl(f_no, f_area);
add_v3_v3(n_final, f_no);
BLI_BITMAP_ENABLE(faces, BM_elem_index_get(f_b));
}
}
}
MEM_freeN(faces);
normalize_v3(n_final);
}
else if (bp->hnmode == BEVEL_HN_ADJ) {
BM_ITER_ELEM(e, &eiter, bv->v, BM_EDGES_OF_VERT) {
if (BM_elem_flag_test(e, BM_ELEM_TAG)) {
if (e->v1 == bv->v) {
add_v3_v3(n_final, e->v2->no);
}
else {
add_v3_v3(n_final, e->v1->no);
}
}
}
normalize_v3(n_final);
}
do {
if (BMO_slot_map_contains(nslot, bcur->nv.v) != true) {
float(*custom_normal) = MEM_callocN(sizeof(*custom_normal) * 3, __func__);
add_v3_v3(custom_normal, n_final);
normalize_v3(custom_normal);
BMO_slot_map_insert(op, nslot, bcur->nv.v, custom_normal);
}
bcur = bcur->next;
} while (bcur != bstart);
}
/* Set the any_seam property for a BevVert and all its BoundVerts */
static void set_bound_vert_seams(BevVert *bv, bool mark_seam, bool mark_sharp)
{
@ -5482,7 +5554,8 @@ void BM_mesh_bevel(
const float segments, const float profile,
const bool vertex_only, const bool use_weights, const bool limit_offset,
const struct MDeformVert *dvert, const int vertex_group, const int mat,
const bool loop_slide, const bool mark_seam, const bool mark_sharp)
const bool loop_slide, const bool mark_seam, const bool mark_sharp,
const int hnmode, BMOperator *op)
{
BMIter iter;
BMVert *v, *v_next;
@ -5505,6 +5578,7 @@ void BM_mesh_bevel(
bp.mat_nr = mat;
bp.mark_seam = mark_seam;
bp.mark_sharp = mark_sharp;
bp.hnmode = hnmode;
if (profile >= 0.999f) { /* r ~ 692, so PRO_SQUARE_R is 1e4 */
bp.pro_super_r = PRO_SQUARE_R;
@ -5561,6 +5635,13 @@ void BM_mesh_bevel(
}
}
GHASH_ITER(giter, bp.vert_hash) {
bv = BLI_ghashIterator_getValue(&giter);
bevel_extend_edge_data(bv);
if(bm->use_toolflags)
bevel_harden_normals_mode(bm, &bp, bv, op);
}
/* Rebuild face polygons around affected vertices */
BM_ITER_MESH (v, &iter, bm, BM_VERTS_OF_MESH) {
if (BM_elem_flag_test(v, BM_ELEM_TAG)) {
@ -5571,9 +5652,7 @@ void BM_mesh_bevel(
BM_ITER_MESH_MUTABLE (v, v_next, &iter, bm, BM_VERTS_OF_MESH) {
if (BM_elem_flag_test(v, BM_ELEM_TAG)) {
BevVert *bv = find_bevvert(&bp, v);
BLI_assert(bv != NULL);
bevel_extend_edge_data(bv);
BLI_assert(find_bevvert(&bp, v) != NULL);
BM_vert_kill(bm, v);
}
}

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@ -33,6 +33,7 @@ void BM_mesh_bevel(
BMesh *bm, const float offset, const int offset_type, const float segments,
const float profile, const bool vertex_only, const bool use_weights,
const bool limit_offset, const struct MDeformVert *dvert, const int vertex_group,
const int mat, const bool loop_slide, const bool mark_seam, const bool mark_sharp);
const int mat, const bool loop_slide, const bool mark_seam, const bool mark_sharp,
const int hnmode, BMOperator *op);
#endif /* __BMESH_BEVEL_H__ */

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@ -30,6 +30,7 @@
#include "BLI_string.h"
#include "BLI_math.h"
#include "BLI_linklist_stack.h"
#include "BLT_translation.h"
@ -38,6 +39,7 @@
#include "BKE_editmesh.h"
#include "BKE_unit.h"
#include "BKE_layer.h"
#include "BKE_mesh.h"
#include "RNA_define.h"
#include "RNA_access.h"
@ -134,6 +136,88 @@ static void edbm_bevel_update_header(bContext *C, wmOperator *op)
}
}
static void bevel_harden_normals(BMEditMesh *em, BMOperator *bmop, float face_strength, int hnmode)
{
BKE_editmesh_lnorspace_update(em);
BM_normals_loops_edges_tag(em->bm, true);
int cd_clnors_offset = CustomData_get_offset(&em->bm->ldata, CD_CUSTOMLOOPNORMAL);
BMesh *bm = em->bm;
BMFace *f;
BMLoop *l, *l_cur, *l_first;
BMIter fiter;
BMOpSlot *nslot = BMO_slot_get(bmop->slots_out, "normals.out");
BM_ITER_MESH(f, &fiter, bm, BM_FACES_OF_MESH) {
l_cur = l_first = BM_FACE_FIRST_LOOP(f);
do {
if (BM_elem_flag_test(l_cur->v, BM_ELEM_SELECT) && (!BM_elem_flag_test(l_cur->e, BM_ELEM_TAG) ||
(!BM_elem_flag_test(l_cur, BM_ELEM_TAG) && BM_loop_check_cyclic_smooth_fan(l_cur))))
{
if (!BM_elem_flag_test(l_cur->e, BM_ELEM_TAG) && !BM_elem_flag_test(l_cur->prev->e, BM_ELEM_TAG)) {
const int loop_index = BM_elem_index_get(l_cur);
short *clnors = BM_ELEM_CD_GET_VOID_P(l_cur, cd_clnors_offset);
BKE_lnor_space_custom_normal_to_data(bm->lnor_spacearr->lspacearr[loop_index], f->no, clnors);
}
else {
BMVert *v_pivot = l_cur->v;
float *calc_n = BLI_ghash_lookup(nslot->data.ghash, v_pivot);
BMEdge *e_next;
const BMEdge *e_org = l_cur->e;
BMLoop *lfan_pivot, *lfan_pivot_next;
lfan_pivot = l_cur;
e_next = lfan_pivot->e;
BLI_SMALLSTACK_DECLARE(loops, BMLoop *);
float cn_wght[3] = { 0.0f, 0.0f, 0.0f }, cn_unwght[3] = { 0.0f, 0.0f, 0.0f };
while (true) {
lfan_pivot_next = BM_vert_step_fan_loop(lfan_pivot, &e_next);
if (lfan_pivot_next) {
BLI_assert(lfan_pivot_next->v == v_pivot);
}
else {
e_next = (lfan_pivot->e == e_next) ? lfan_pivot->prev->e : lfan_pivot->e;
}
BLI_SMALLSTACK_PUSH(loops, lfan_pivot);
float cur[3];
mul_v3_v3fl(cur, lfan_pivot->f->no, BM_face_calc_area(lfan_pivot->f));
add_v3_v3(cn_wght, cur);
if(BM_elem_flag_test(lfan_pivot->f, BM_ELEM_SELECT))
add_v3_v3(cn_unwght, cur);
if (!BM_elem_flag_test(e_next, BM_ELEM_TAG) || (e_next == e_org)) {
break;
}
lfan_pivot = lfan_pivot_next;
}
normalize_v3(cn_wght);
normalize_v3(cn_unwght);
if (calc_n) {
mul_v3_fl(calc_n, face_strength);
mul_v3_fl(cn_wght, 1.0f - face_strength);
add_v3_v3(calc_n, cn_wght);
normalize_v3(calc_n);
}
while ((l = BLI_SMALLSTACK_POP(loops))) {
const int l_index = BM_elem_index_get(l);
short *clnors = BM_ELEM_CD_GET_VOID_P(l, cd_clnors_offset);
if (calc_n) {
BKE_lnor_space_custom_normal_to_data(bm->lnor_spacearr->lspacearr[l_index], calc_n, clnors);
}
else
BKE_lnor_space_custom_normal_to_data(bm->lnor_spacearr->lspacearr[l_index], cn_unwght, clnors);
}
BLI_ghash_remove(nslot->data.ghash, v_pivot, NULL, MEM_freeN);
}
}
} while ((l_cur = l_cur->next) != l_first);
}
}
static bool edbm_bevel_init(bContext *C, wmOperator *op, const bool is_modal)
{
Scene *scene = CTX_data_scene(C);
@ -226,6 +310,8 @@ static bool edbm_bevel_calc(wmOperator *op)
const bool loop_slide = RNA_boolean_get(op->ptr, "loop_slide");
const bool mark_seam = RNA_boolean_get(op->ptr, "mark_seam");
const bool mark_sharp = RNA_boolean_get(op->ptr, "mark_sharp");
const float strength = RNA_float_get(op->ptr, "strength");
const int hnmode = RNA_enum_get(op->ptr, "hnmode");
for (uint ob_index = 0; ob_index < opdata->ob_store_len; ob_index++) {
@ -242,9 +328,9 @@ static bool edbm_bevel_calc(wmOperator *op)
EDBM_op_init(em, &bmop, op,
"bevel geom=%hev offset=%f segments=%i vertex_only=%b offset_type=%i profile=%f clamp_overlap=%b "
"material=%i loop_slide=%b mark_seam=%b mark_sharp=%b",
"material=%i loop_slide=%b mark_seam=%b mark_sharp=%b strength=%f hnmode=%i",
BM_ELEM_SELECT, offset, segments, vertex_only, offset_type, profile,
clamp_overlap, material, loop_slide, mark_seam, mark_sharp);
clamp_overlap, material, loop_slide, mark_seam, mark_sharp, strength, hnmode);
BMO_op_exec(em->bm, &bmop);
@ -255,6 +341,8 @@ static bool edbm_bevel_calc(wmOperator *op)
BMO_slot_buffer_hflag_enable(em->bm, bmop.slots_out, "faces.out", BM_FACE, BM_ELEM_SELECT, true);
}
bevel_harden_normals(em, &bmop, strength, hnmode);
/* no need to de-select existing geometry */
if (!EDBM_op_finish(em, &bmop, op, true)) {
continue;
@ -663,6 +751,12 @@ void MESH_OT_bevel(wmOperatorType *ot)
{0, NULL, 0, NULL, NULL},
};
static EnumPropertyItem harden_normals_items[] = {
{ BEVEL_HN_FACE, "HN_FACE", 0, "Face Area", "Use faces as weight" },
{ BEVEL_HN_ADJ, "HN_ADJ", 0, "Vertex average", "Use adjacent vertices as weight" },
{ 0, NULL, 0, NULL, NULL },
};
/* identifiers */
ot->name = "Bevel";
ot->description = "Edge Bevel";
@ -692,4 +786,6 @@ void MESH_OT_bevel(wmOperatorType *ot)
RNA_def_boolean(ot->srna, "mark_sharp", false, "Mark Sharp", "Mark beveled edges as sharp");
RNA_def_int(ot->srna, "material", -1, -1, INT_MAX, "Material",
"Material for bevel faces (-1 means use adjacent faces)", -1, 100);
RNA_def_float(ot->srna, "strength", 0.5f, 0.0f, 1.0f, "Normal Strength", "Strength of calculated normal", 0.0f, 1.0f);
RNA_def_enum(ot->srna, "hnmode", harden_normals_items, BEVEL_HN_FACE, "Normal Mode", "Weighting mode for Harden Normals");
}

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@ -7426,41 +7426,6 @@ void MESH_OT_point_normals(struct wmOperatorType *ot)
/********************** Split/Merge Loop Normals **********************/
static void normals_splitmerge_loops_edges_tag(BMesh *bm, const bool do_edges)
{
BMFace *f;
BMEdge *e;
BMIter fiter, eiter;
BMLoop *l_curr, *l_first;
if (do_edges) {
int index_edge;
BM_ITER_MESH_INDEX(e, &eiter, bm, BM_EDGES_OF_MESH, index_edge) {
BMLoop *l_a, *l_b;
BM_elem_index_set(e, index_edge); /* set_inline */
BM_elem_flag_disable(e, BM_ELEM_TAG);
if (BM_edge_loop_pair(e, &l_a, &l_b)) {
if (BM_elem_flag_test(e, BM_ELEM_SMOOTH) && l_a->v != l_b->v) {
BM_elem_flag_enable(e, BM_ELEM_TAG);
}
}
}
bm->elem_index_dirty &= ~BM_EDGE;
}
int index_face, index_loop = 0;
BM_ITER_MESH_INDEX(f, &fiter, bm, BM_FACES_OF_MESH, index_face) {
BM_elem_index_set(f, index_face); /* set_inline */
l_curr = l_first = BM_FACE_FIRST_LOOP(f);
do {
BM_elem_index_set(l_curr, index_loop++); /* set_inline */
BM_elem_flag_disable(l_curr, BM_ELEM_TAG);
} while ((l_curr = l_curr->next) != l_first);
}
bm->elem_index_dirty &= ~(BM_FACE | BM_LOOP);
}
static void normals_merge(BMesh *bm, BMLoopNorEditDataArray *lnors_ed_arr)
{
BMLoopNorEditData *lnor_ed = lnors_ed_arr->lnor_editdata;
@ -7469,7 +7434,7 @@ static void normals_merge(BMesh *bm, BMLoopNorEditDataArray *lnors_ed_arr)
BLI_assert(bm->lnor_spacearr->data_type == MLNOR_SPACEARR_BMLOOP_PTR);
normals_splitmerge_loops_edges_tag(bm, false);
BM_normals_loops_edges_tag(bm, false);
for (int i = 0; i < lnors_ed_arr->totloop; i++, lnor_ed++) {
if (BM_elem_flag_test(lnor_ed->loop, BM_ELEM_TAG)) {
@ -7512,7 +7477,7 @@ static void normals_split(BMesh *bm)
BLI_assert(bm->lnor_spacearr->data_type == MLNOR_SPACEARR_BMLOOP_PTR);
normals_splitmerge_loops_edges_tag(bm, true);
BM_normals_loops_edges_tag(bm, true);
const int cd_clnors_offset = CustomData_get_offset(&bm->ldata, CD_CUSTOMLOOPNORMAL);
BM_ITER_MESH(f, &fiter, bm, BM_FACES_OF_MESH) {
@ -7695,7 +7660,7 @@ static int edbm_average_normals_exec(bContext *C, wmOperator *op)
weight = (weight - 1) * 25;
}
normals_splitmerge_loops_edges_tag(bm, true);
BM_normals_loops_edges_tag(bm, true);
Heap *loop_weight = BLI_heap_new();

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@ -334,6 +334,8 @@ typedef struct BevelModifierData {
/* if the MOD_BEVEL_ANGLE is set, this will be how "sharp" an edge must be before it gets beveled */
float bevel_angle;
/* if the MOD_BEVEL_VWEIGHT option is set, this will be the name of the vert group, MAX_VGROUP_NAME */
int hnmode;
float strength;
char defgrp_name[64];
} BevelModifierData;
@ -371,6 +373,12 @@ enum {
MOD_BEVEL_MARK_SHARP = (1 << 1),
};
/* BevelModifierData->hnmode */
enum {
MOD_BEVEL_HN_FACE,
MOD_BEVEL_HN_ADJ,
};
typedef struct SmokeModifierData {
ModifierData modifier;

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@ -3028,6 +3028,12 @@ static void rna_def_modifier_bevel(BlenderRNA *brna)
{0, NULL, 0, NULL, NULL}
};
static EnumPropertyItem prop_harden_normals_items[] = {
{ MOD_BEVEL_HN_FACE, "HN_FACE", 0, "Face Area", "Use faces as weight" },
{ MOD_BEVEL_HN_ADJ, "HN_ADJ", 0, "Vertex average", "Use adjacent vertices as weight" },
{ 0, NULL, 0, NULL, NULL },
};
srna = RNA_def_struct(brna, "BevelModifier", "Modifier");
RNA_def_struct_ui_text(srna, "Bevel Modifier", "Bevel modifier to make edges and vertices more rounded");
RNA_def_struct_sdna(srna, "BevelModifierData");
@ -3114,6 +3120,17 @@ static void rna_def_modifier_bevel(BlenderRNA *brna)
RNA_def_property_boolean_sdna(prop, NULL, "edge_flags", MOD_BEVEL_MARK_SHARP);
RNA_def_property_ui_text(prop, "Mark Sharp", "Mark beveled edges as sharp");
RNA_def_property_update(prop, 0, "rna_Modifier_update");
prop = RNA_def_property(srna, "hnmode", PROP_ENUM, PROP_NONE);
RNA_def_property_enum_items(prop, prop_harden_normals_items);
RNA_def_property_ui_text(prop, "Normal Mode", "Weighting mode for Harden Normals");
RNA_def_property_update(prop, 0, "rna_Modifier_update");
prop = RNA_def_property(srna, "strength", PROP_FLOAT, PROP_NONE);
RNA_def_property_range(prop, 0, 10);
RNA_def_property_ui_range(prop, 0, 10, 1, 2);
RNA_def_property_ui_text(prop, "Normal Strength", "Strength of calculated normal");
RNA_def_property_update(prop, 0, "rna_Modifier_update");
}
static void rna_def_modifier_shrinkwrap(BlenderRNA *brna)

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@ -169,7 +169,7 @@ static Mesh *applyModifier(ModifierData *md, const ModifierEvalContext *ctx, Mes
BM_mesh_bevel(bm, bmd->value, offset_type, bmd->res, bmd->profile,
vertex_only, bmd->lim_flags & MOD_BEVEL_WEIGHT, do_clamp,
dvert, vgroup, mat, loop_slide, mark_seam, mark_sharp);
dvert, vgroup, mat, loop_slide, mark_seam, mark_sharp, bmd->hnmode, NULL);
result = BKE_bmesh_to_mesh_nomain(bm, &(struct BMeshToMeshParams){0});