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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2005 Blender Foundation. All rights reserved. */
/** \file
* \ingroup modifiers
*
* Edge Split modifier
*
* Splits edges in the mesh according to sharpness flag
* or edge angle (can be used to achieve auto-smoothing)
*/
#include "BLI_utildefines.h"
#include "BLI_math.h"
#include "BLT_translation.h"
#include "DNA_defaults.h"
#include "DNA_mesh_types.h"
#include "DNA_object_types.h"
#include "DNA_screen_types.h"
#include "BKE_context.h"
#include "BKE_mesh.h"
#include "BKE_modifier.h"
#include "BKE_screen.h"
#include "UI_interface.h"
#include "UI_resources.h"
#include "RNA_access.h"
#include "RNA_prototypes.h"
#include "bmesh.h"
#include "bmesh_tools.h"
#include "MOD_modifiertypes.h"
#include "MOD_ui_common.h"
/* For edge split modifier node. */
Mesh *doEdgeSplit(const Mesh *mesh, EdgeSplitModifierData *emd);
Mesh *doEdgeSplit(const Mesh *mesh, EdgeSplitModifierData *emd)
{
Mesh *result;
BMesh *bm;
BMIter iter;
BMEdge *e;
const float threshold = cosf(emd->split_angle + 0.000000175f);
const bool do_split_angle = (emd->flags & MOD_EDGESPLIT_FROMANGLE) != 0 &&
emd->split_angle < (float)M_PI;
const bool do_split_all = do_split_angle && emd->split_angle < FLT_EPSILON;
const bool calc_face_normals = do_split_angle && !do_split_all;
bm = BKE_mesh_to_bmesh_ex(mesh,
&(struct BMeshCreateParams){0},
&(struct BMeshFromMeshParams){
.calc_face_normal = calc_face_normals,
.calc_vert_normal = false,
.add_key_index = false,
.use_shapekey = false,
.active_shapekey = 0,
.cd_mask_extra = {.vmask = CD_MASK_ORIGINDEX,
.emask = CD_MASK_ORIGINDEX,
.pmask = CD_MASK_ORIGINDEX},
});
if (do_split_angle) {
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
/* check for 1 edge having 2 face users */
BMLoop *l1, *l2;
if ((l1 = e->l) && (l2 = e->l->radial_next) != l1) {
if (/* 3+ faces on this edge, always split */
UNLIKELY(l1 != l2->radial_next) ||
/* O° angle setting, we want to split on all edges. */
do_split_all ||
/* 2 face edge - check angle. */
(dot_v3v3(l1->f->no, l2->f->no) < threshold)) {
BM_elem_flag_enable(e, BM_ELEM_TAG);
}
}
}
}
if (emd->flags & MOD_EDGESPLIT_FROMFLAG) {
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
/* check for 2 or more edge users */
if ((e->l) && (e->l->next != e->l)) {
if (!BM_elem_flag_test(e, BM_ELEM_SMOOTH)) {
BM_elem_flag_enable(e, BM_ELEM_TAG);
}
}
}
}
BM_mesh_edgesplit(bm, false, true, false);
/* Uncomment for troubleshooting. */
// BM_mesh_validate(bm);
result = BKE_mesh_from_bmesh_for_eval_nomain(bm, NULL, mesh);
BM_mesh_free(bm);
return result;
}
static void initData(ModifierData *md)
{
EdgeSplitModifierData *emd = (EdgeSplitModifierData *)md;
BLI_assert(MEMCMP_STRUCT_AFTER_IS_ZERO(emd, modifier));
MEMCPY_STRUCT_AFTER(emd, DNA_struct_default_get(EdgeSplitModifierData), modifier);
}
static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *UNUSED(ctx), Mesh *mesh)
{
Mesh *result;
EdgeSplitModifierData *emd = (EdgeSplitModifierData *)md;
if (!(emd->flags & (MOD_EDGESPLIT_FROMANGLE | MOD_EDGESPLIT_FROMFLAG))) {
return mesh;
}
result = doEdgeSplit(mesh, emd);
return result;
}
static void panel_draw(const bContext *UNUSED(C), Panel *panel)
{
uiLayout *row, *sub;
uiLayout *layout = panel->layout;
PointerRNA *ptr = modifier_panel_get_property_pointers(panel, NULL);
uiLayoutSetPropSep(layout, true);
row = uiLayoutRowWithHeading(layout, true, IFACE_("Edge Angle"));
uiItemR(row, ptr, "use_edge_angle", 0, "", ICON_NONE);
sub = uiLayoutRow(row, true);
uiLayoutSetActive(sub, RNA_boolean_get(ptr, "use_edge_angle"));
uiItemR(sub, ptr, "split_angle", 0, "", ICON_NONE);
uiItemR(layout, ptr, "use_edge_sharp", 0, IFACE_("Sharp Edges"), ICON_NONE);
modifier_panel_end(layout, ptr);
}
static void panelRegister(ARegionType *region_type)
{
modifier_panel_register(region_type, eModifierType_EdgeSplit, panel_draw);
}
ModifierTypeInfo modifierType_EdgeSplit = {
/* name */ "EdgeSplit",
/* structName */ "EdgeSplitModifierData",
/* structSize */ sizeof(EdgeSplitModifierData),
/* srna */ &RNA_EdgeSplitModifier,
/* type */ eModifierTypeType_Constructive,
/* flags */ eModifierTypeFlag_AcceptsMesh | eModifierTypeFlag_AcceptsCVs |
eModifierTypeFlag_SupportsMapping | eModifierTypeFlag_SupportsEditmode |
eModifierTypeFlag_EnableInEditmode,
/* icon */ ICON_MOD_EDGESPLIT,
/* copyData */ BKE_modifier_copydata_generic,
/* deformVerts */ NULL,
/* deformMatrices */ NULL,
/* deformVertsEM */ NULL,
/* deformMatricesEM */ NULL,
/* modifyMesh */ modifyMesh,
/* modifyGeometrySet */ NULL,
/* initData */ initData,
/* requiredDataMask */ NULL,
/* freeData */ NULL,
/* isDisabled */ NULL,
/* updateDepsgraph */ NULL,
/* dependsOnTime */ NULL,
/* dependsOnNormals */ NULL,
/* foreachIDLink */ NULL,
/* foreachTexLink */ NULL,
/* freeRuntimeData */ NULL,
/* panelRegister */ panelRegister,
/* blendWrite */ NULL,
/* blendRead */ NULL,
};
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