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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2005 Blender Foundation. All rights reserved. */
/** \file
* \ingroup modifiers
*
* Weld modifier: Remove doubles.
*/
/* TODOs:
* - Review weight and vertex color interpolation.;
*/
#include "MEM_guardedalloc.h"
#include "BLI_utildefines.h"
#include "BLI_array.hh"
#include "BLI_index_range.hh"
#include "BLI_span.hh"
#include "BLI_vector.hh"
#include "BLT_translation.h"
#include "DNA_defaults.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "DNA_screen_types.h"
#ifdef USE_BVHTREEKDOP
# include "BKE_bvhutils.h"
#endif
#include "BKE_context.h"
#include "BKE_deform.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 "DEG_depsgraph.h"
#include "MOD_modifiertypes.h"
#include "MOD_ui_common.h"
#include "GEO_mesh_merge_by_distance.hh"
using blender::Array;
using blender::IndexMask;
using blender::Span;
using blender::Vector;
static Span<MDeformVert> get_vertex_group(const Mesh &mesh, const int defgrp_index)
{
if (defgrp_index == -1) {
return {};
}
const MDeformVert *vertex_group = static_cast<const MDeformVert *>(
CustomData_get_layer(&mesh.vdata, CD_MDEFORMVERT));
if (!vertex_group) {
return {};
}
return {vertex_group, mesh.totvert};
}
static Vector<int64_t> selected_indices_from_vertex_group(Span<MDeformVert> vertex_group,
const int index,
const bool invert)
{
Vector<int64_t> selected_indices;
for (const int i : vertex_group.index_range()) {
const bool found = BKE_defvert_find_weight(&vertex_group[i], index) > 0.0f;
if (found != invert) {
selected_indices.append(i);
}
}
return selected_indices;
}
static Array<bool> selection_array_from_vertex_group(Span<MDeformVert> vertex_group,
const int index,
const bool invert)
{
Array<bool> selection(vertex_group.size());
for (const int i : vertex_group.index_range()) {
const bool found = BKE_defvert_find_weight(&vertex_group[i], index) > 0.0f;
selection[i] = (found != invert);
}
return selection;
}
static std::optional<Mesh *> calculate_weld(const Mesh &mesh, const WeldModifierData &wmd)
{
const int defgrp_index = BKE_id_defgroup_name_index(&mesh.id, wmd.defgrp_name);
Span<MDeformVert> vertex_group = get_vertex_group(mesh, defgrp_index);
const bool invert = (wmd.flag & MOD_WELD_INVERT_VGROUP) != 0;
if (wmd.mode == MOD_WELD_MODE_ALL) {
if (!vertex_group.is_empty()) {
Vector<int64_t> selected_indices = selected_indices_from_vertex_group(
vertex_group, defgrp_index, invert);
return blender::geometry::mesh_merge_by_distance_all(
mesh, IndexMask(selected_indices), wmd.merge_dist);
}
return blender::geometry::mesh_merge_by_distance_all(
mesh, IndexMask(mesh.totvert), wmd.merge_dist);
}
if (wmd.mode == MOD_WELD_MODE_CONNECTED) {
const bool only_loose_edges = (wmd.flag & MOD_WELD_LOOSE_EDGES) != 0;
if (!vertex_group.is_empty()) {
Array<bool> selection = selection_array_from_vertex_group(
vertex_group, defgrp_index, invert);
return blender::geometry::mesh_merge_by_distance_connected(
mesh, selection, wmd.merge_dist, only_loose_edges);
}
Array<bool> selection(mesh.totvert, true);
return blender::geometry::mesh_merge_by_distance_connected(
mesh, selection, wmd.merge_dist, only_loose_edges);
}
BLI_assert_unreachable();
return nullptr;
}
static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *UNUSED(ctx), Mesh *mesh)
{
const WeldModifierData &wmd = reinterpret_cast<WeldModifierData &>(*md);
std::optional<Mesh *> result = calculate_weld(*mesh, wmd);
if (!result) {
return mesh;
}
return *result;
}
static void initData(ModifierData *md)
{
WeldModifierData *wmd = (WeldModifierData *)md;
BLI_assert(MEMCMP_STRUCT_AFTER_IS_ZERO(wmd, modifier));
MEMCPY_STRUCT_AFTER(wmd, DNA_struct_default_get(WeldModifierData), modifier);
}
static void requiredDataMask(ModifierData *md, CustomData_MeshMasks *r_cddata_masks)
{
WeldModifierData *wmd = (WeldModifierData *)md;
/* Ask for vertexgroups if we need them. */
if (wmd->defgrp_name[0] != '\0') {
r_cddata_masks->vmask |= CD_MASK_MDEFORMVERT;
}
}
static void panel_draw(const bContext *UNUSED(C), Panel *panel)
{
uiLayout *layout = panel->layout;
PointerRNA ob_ptr;
PointerRNA *ptr = modifier_panel_get_property_pointers(panel, &ob_ptr);
int weld_mode = RNA_enum_get(ptr, "mode");
uiLayoutSetPropSep(layout, true);
uiItemR(layout, ptr, "mode", 0, nullptr, ICON_NONE);
uiItemR(layout, ptr, "merge_threshold", 0, IFACE_("Distance"), ICON_NONE);
if (weld_mode == MOD_WELD_MODE_CONNECTED) {
uiItemR(layout, ptr, "loose_edges", 0, nullptr, ICON_NONE);
}
modifier_vgroup_ui(layout, ptr, &ob_ptr, "vertex_group", "invert_vertex_group", nullptr);
modifier_panel_end(layout, ptr);
}
static void panelRegister(ARegionType *region_type)
{
modifier_panel_register(region_type, eModifierType_Weld, panel_draw);
}
ModifierTypeInfo modifierType_Weld = {
/* name */ N_("Weld"),
/* structName */ "WeldModifierData",
/* structSize */ sizeof(WeldModifierData),
/* srna */ &RNA_WeldModifier,
/* type */ eModifierTypeType_Constructive,
/* flags */
(ModifierTypeFlag)(eModifierTypeFlag_AcceptsMesh | eModifierTypeFlag_SupportsMapping |
eModifierTypeFlag_SupportsEditmode | eModifierTypeFlag_EnableInEditmode |
eModifierTypeFlag_AcceptsCVs),
/* icon */ ICON_AUTOMERGE_OFF, /* TODO: Use correct icon. */
/* copyData */ BKE_modifier_copydata_generic,
/* deformVerts */ nullptr,
/* deformMatrices */ nullptr,
/* deformVertsEM */ nullptr,
/* deformMatricesEM */ nullptr,
/* modifyMesh */ modifyMesh,
/* modifyGeometrySet */ nullptr,
/* initData */ initData,
/* requiredDataMask */ requiredDataMask,
/* freeData */ nullptr,
/* isDisabled */ nullptr,
/* updateDepsgraph */ nullptr,
/* dependsOnTime */ nullptr,
/* dependsOnNormals */ nullptr,
/* foreachIDLink */ nullptr,
/* foreachTexLink */ nullptr,
/* freeRuntimeData */ nullptr,
/* panelRegister */ panelRegister,
/* blendWrite */ nullptr,
/* blendRead */ nullptr,
};
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