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8a364ef72c3e4258cc537a5cf3da16d9a69bb896
test2/source/blender/modifiers/intern/MOD_laplaciansmooth.cc
Sergey Sharybin a12a8a71bb Remove "All Rights Reserved" from Blender Foundation copyright code 
The goal is to solve confusion of the "All rights reserved" for licensing
code under an open-source license.

The phrase "All rights reserved" comes from a historical convention that
required this phrase for the copyright protection to apply. This convention
is no longer relevant.

However, even though the phrase has no meaning in establishing the copyright
it has not lost meaning in terms of licensing.

This change makes it so code under the Blender Foundation copyright does
not use "all rights reserved". This is also how the GPL license itself
states how to apply it to the source code:

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software ...

This change does not change copyright notice in cases when the copyright
is dual (BF and an author), or just an author of the code. It also does
mot change copyright which is inherited from NaN Holding BV as it needs
some further investigation about what is the proper way to handle it.
2023-03-30 10:51:59 +02:00

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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2005 Blender Foundation */
/** \file
* \ingroup modifiers
*/
#include "BLI_utildefines.h"
#include "BLI_math.h"
#include "BLT_translation.h"
#include "DNA_defaults.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"
#include "DNA_screen_types.h"
#include "MEM_guardedalloc.h"
#include "BKE_context.h"
#include "BKE_deform.h"
#include "BKE_editmesh.h"
#include "BKE_lib_id.h"
#include "BKE_mesh.hh"
#include "BKE_mesh_wrapper.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 "MOD_ui_common.h"
#include "MOD_util.h"
#include "eigen_capi.h"
struct LaplacianSystem {
float *eweights; /* Length weights per Edge */
float (*fweights)[3]; /* Cotangent weights per face */
float *ring_areas; /* Total area per ring. */
float *vlengths; /* Total sum of lengths(edges) per vertex. */
float *vweights; /* Total sum of weights per vertex. */
int verts_num; /* Number of verts. */
short *ne_fa_num; /* Number of neighbors faces around vertex. */
short *ne_ed_num; /* Number of neighbors Edges around vertex. */
bool *zerola; /* Is zero area or length. */
/* Pointers to data. */
float (*vertexCos)[3];
blender::Span<MEdge> edges;
blender::Span<MPoly> polys;
blender::Span<int> corner_verts;
LinearSolver *context;
/* Data. */
float min_area;
float vert_centroid[3];
};
static void delete_laplacian_system(LaplacianSystem *sys)
{
MEM_SAFE_FREE(sys->eweights);
MEM_SAFE_FREE(sys->fweights);
MEM_SAFE_FREE(sys->ne_ed_num);
MEM_SAFE_FREE(sys->ne_fa_num);
MEM_SAFE_FREE(sys->ring_areas);
MEM_SAFE_FREE(sys->vlengths);
MEM_SAFE_FREE(sys->vweights);
MEM_SAFE_FREE(sys->zerola);
if (sys->context) {
EIG_linear_solver_delete(sys->context);
}
sys->vertexCos = nullptr;
MEM_freeN(sys);
}
static void memset_laplacian_system(LaplacianSystem *sys, int val)
{
memset(sys->eweights, val, sizeof(float) * sys->edges.size());
memset(sys->fweights, val, sizeof(float[3]) * sys->corner_verts.size());
memset(sys->ne_ed_num, val, sizeof(short) * sys->verts_num);
memset(sys->ne_fa_num, val, sizeof(short) * sys->verts_num);
memset(sys->ring_areas, val, sizeof(float) * sys->verts_num);
memset(sys->vlengths, val, sizeof(float) * sys->verts_num);
memset(sys->vweights, val, sizeof(float) * sys->verts_num);
memset(sys->zerola, val, sizeof(bool) * sys->verts_num);
}
static LaplacianSystem *init_laplacian_system(int a_numEdges, int a_numLoops, int a_numVerts)
{
LaplacianSystem *sys;
sys = static_cast<LaplacianSystem *>(MEM_callocN(sizeof(LaplacianSystem), __func__));
sys->verts_num = a_numVerts;
sys->eweights = MEM_cnew_array<float>(a_numEdges, __func__);
sys->fweights = MEM_cnew_array<float[3]>(a_numLoops, __func__);
sys->ne_ed_num = MEM_cnew_array<short>(sys->verts_num, __func__);
sys->ne_fa_num = MEM_cnew_array<short>(sys->verts_num, __func__);
sys->ring_areas = MEM_cnew_array<float>(sys->verts_num, __func__);
sys->vlengths = MEM_cnew_array<float>(sys->verts_num, __func__);
sys->vweights = MEM_cnew_array<float>(sys->verts_num, __func__);
sys->zerola = MEM_cnew_array<bool>(sys->verts_num, __func__);
return sys;
}
static float compute_volume(const float center[3],
float (*vertexCos)[3],
const blender::Span<MPoly> polys,
const blender::Span<int> corner_verts)
{
float vol = 0.0f;
for (const int i : polys.index_range()) {
const MPoly &poly = polys[i];
int corner_first = poly.loopstart;
int corner_prev = corner_first + 1;
int corner_curr = corner_first + 2;
int corner_term = corner_first + poly.totloop;
for (; corner_curr != corner_term; corner_prev = corner_curr, corner_curr++) {
vol += volume_tetrahedron_signed_v3(center,
vertexCos[corner_verts[corner_first]],
vertexCos[corner_verts[corner_prev]],
vertexCos[corner_verts[corner_curr]]);
}
}
return fabsf(vol);
}
static void volume_preservation(LaplacianSystem *sys, float vini, float vend, short flag)
{
float beta;
int i;
if (vend != 0.0f) {
beta = pow(vini / vend, 1.0f / 3.0f);
for (i = 0; i < sys->verts_num; i++) {
if (flag & MOD_LAPLACIANSMOOTH_X) {
sys->vertexCos[i][0] = (sys->vertexCos[i][0] - sys->vert_centroid[0]) * beta +
sys->vert_centroid[0];
}
if (flag & MOD_LAPLACIANSMOOTH_Y) {
sys->vertexCos[i][1] = (sys->vertexCos[i][1] - sys->vert_centroid[1]) * beta +
sys->vert_centroid[1];
}
if (flag & MOD_LAPLACIANSMOOTH_Z) {
sys->vertexCos[i][2] = (sys->vertexCos[i][2] - sys->vert_centroid[2]) * beta +
sys->vert_centroid[2];
}
}
}
}
static void init_laplacian_matrix(LaplacianSystem *sys)
{
float *v1, *v2;
float w1, w2, w3;
float areaf;
int i;
uint idv1, idv2;
for (i = 0; i < sys->edges.size(); i++) {
idv1 = sys->edges[i].v1;
idv2 = sys->edges[i].v2;
v1 = sys->vertexCos[idv1];
v2 = sys->vertexCos[idv2];
sys->ne_ed_num[idv1] = sys->ne_ed_num[idv1] + 1;
sys->ne_ed_num[idv2] = sys->ne_ed_num[idv2] + 1;
w1 = len_v3v3(v1, v2);
if (w1 < sys->min_area) {
sys->zerola[idv1] = true;
sys->zerola[idv2] = true;
}
else {
w1 = 1.0f / w1;
}
sys->eweights[i] = w1;
}
const blender::Span<int> corner_verts = sys->corner_verts;
for (const int i : sys->polys.index_range()) {
const MPoly &poly = sys->polys[i];
int corner_next = poly.loopstart;
int corner_term = corner_next + poly.totloop;
int corner_prev = corner_term - 2;
int corner_curr = corner_term - 1;
for (; corner_next != corner_term;
corner_prev = corner_curr, corner_curr = corner_next, corner_next++) {
const float *v_prev = sys->vertexCos[corner_verts[corner_prev]];
const float *v_curr = sys->vertexCos[corner_verts[corner_curr]];
const float *v_next = sys->vertexCos[corner_verts[corner_next]];
sys->ne_fa_num[corner_verts[corner_curr]] += 1;
areaf = area_tri_v3(v_prev, v_curr, v_next);
if (areaf < sys->min_area) {
sys->zerola[corner_verts[corner_curr]] = true;
}
sys->ring_areas[corner_verts[corner_prev]] += areaf;
sys->ring_areas[corner_verts[corner_curr]] += areaf;
sys->ring_areas[corner_verts[corner_next]] += areaf;
w1 = cotangent_tri_weight_v3(v_curr, v_next, v_prev) / 2.0f;
w2 = cotangent_tri_weight_v3(v_next, v_prev, v_curr) / 2.0f;
w3 = cotangent_tri_weight_v3(v_prev, v_curr, v_next) / 2.0f;
sys->fweights[corner_curr][0] += w1;
sys->fweights[corner_curr][1] += w2;
sys->fweights[corner_curr][2] += w3;
sys->vweights[corner_verts[corner_curr]] += w2 + w3;
sys->vweights[corner_verts[corner_next]] += w1 + w3;
sys->vweights[corner_verts[corner_prev]] += w1 + w2;
}
}
for (i = 0; i < sys->edges.size(); i++) {
idv1 = sys->edges[i].v1;
idv2 = sys->edges[i].v2;
/* if is boundary, apply scale-dependent umbrella operator only with neighbors in boundary */
if (sys->ne_ed_num[idv1] != sys->ne_fa_num[idv1] &&
sys->ne_ed_num[idv2] != sys->ne_fa_num[idv2]) {
sys->vlengths[idv1] += sys->eweights[i];
sys->vlengths[idv2] += sys->eweights[i];
}
}
}
static void fill_laplacian_matrix(LaplacianSystem *sys)
{
int i;
uint idv1, idv2;
const blender::Span<int> corner_verts = sys->corner_verts;
for (const int i : sys->polys.index_range()) {
const MPoly &poly = sys->polys[i];
int corner_next = poly.loopstart;
int corner_term = corner_next + poly.totloop;
int corner_prev = corner_term - 2;
int corner_curr = corner_term - 1;
for (; corner_next != corner_term;
corner_prev = corner_curr, corner_curr = corner_next, corner_next++) {
/* Is ring if number of faces == number of edges around vertex. */
if (sys->ne_ed_num[corner_verts[corner_curr]] == sys->ne_fa_num[corner_verts[corner_curr]] &&
sys->zerola[corner_verts[corner_curr]] == false) {
EIG_linear_solver_matrix_add(sys->context,
corner_verts[corner_curr],
corner_verts[corner_next],
sys->fweights[corner_curr][2] *
sys->vweights[corner_verts[corner_curr]]);
EIG_linear_solver_matrix_add(sys->context,
corner_verts[corner_curr],
corner_verts[corner_prev],
sys->fweights[corner_curr][1] *
sys->vweights[corner_verts[corner_curr]]);
}
if (sys->ne_ed_num[corner_verts[corner_next]] == sys->ne_fa_num[corner_verts[corner_next]] &&
sys->zerola[corner_verts[corner_next]] == false) {
EIG_linear_solver_matrix_add(sys->context,
corner_verts[corner_next],
corner_verts[corner_curr],
sys->fweights[corner_curr][2] *
sys->vweights[corner_verts[corner_next]]);
EIG_linear_solver_matrix_add(sys->context,
corner_verts[corner_next],
corner_verts[corner_prev],
sys->fweights[corner_curr][0] *
sys->vweights[corner_verts[corner_next]]);
}
if (sys->ne_ed_num[corner_verts[corner_prev]] == sys->ne_fa_num[corner_verts[corner_prev]] &&
sys->zerola[corner_verts[corner_prev]] == false) {
EIG_linear_solver_matrix_add(sys->context,
corner_verts[corner_prev],
corner_verts[corner_curr],
sys->fweights[corner_curr][1] *
sys->vweights[corner_verts[corner_prev]]);
EIG_linear_solver_matrix_add(sys->context,
corner_verts[corner_prev],
corner_verts[corner_next],
sys->fweights[corner_curr][0] *
sys->vweights[corner_verts[corner_prev]]);
}
}
}
for (i = 0; i < sys->edges.size(); i++) {
idv1 = sys->edges[i].v1;
idv2 = sys->edges[i].v2;
/* Is boundary */
if (sys->ne_ed_num[idv1] != sys->ne_fa_num[idv1] &&
sys->ne_ed_num[idv2] != sys->ne_fa_num[idv2] && sys->zerola[idv1] == false &&
sys->zerola[idv2] == false) {
EIG_linear_solver_matrix_add(
sys->context, idv1, idv2, sys->eweights[i] * sys->vlengths[idv1]);
EIG_linear_solver_matrix_add(
sys->context, idv2, idv1, sys->eweights[i] * sys->vlengths[idv2]);
}
}
}
static void validate_solution(LaplacianSystem *sys, short flag, float lambda, float lambda_border)
{
int i;
float lam;
float vini = 0.0f, vend = 0.0f;
if (flag & MOD_LAPLACIANSMOOTH_PRESERVE_VOLUME) {
vini = compute_volume(sys->vert_centroid, sys->vertexCos, sys->polys, sys->corner_verts);
}
for (i = 0; i < sys->verts_num; i++) {
if (sys->zerola[i] == false) {
lam = sys->ne_ed_num[i] == sys->ne_fa_num[i] ? (lambda >= 0.0f ? 1.0f : -1.0f) :
(lambda_border >= 0.0f ? 1.0f : -1.0f);
if (flag & MOD_LAPLACIANSMOOTH_X) {
sys->vertexCos[i][0] += lam * (float(EIG_linear_solver_variable_get(sys->context, 0, i)) -
sys->vertexCos[i][0]);
}
if (flag & MOD_LAPLACIANSMOOTH_Y) {
sys->vertexCos[i][1] += lam * (float(EIG_linear_solver_variable_get(sys->context, 1, i)) -
sys->vertexCos[i][1]);
}
if (flag & MOD_LAPLACIANSMOOTH_Z) {
sys->vertexCos[i][2] += lam * (float(EIG_linear_solver_variable_get(sys->context, 2, i)) -
sys->vertexCos[i][2]);
}
}
}
if (flag & MOD_LAPLACIANSMOOTH_PRESERVE_VOLUME) {
vend = compute_volume(sys->vert_centroid, sys->vertexCos, sys->polys, sys->corner_verts);
volume_preservation(sys, vini, vend, flag);
}
}
static void laplaciansmoothModifier_do(
LaplacianSmoothModifierData *smd, Object *ob, Mesh *mesh, float (*vertexCos)[3], int verts_num)
{
LaplacianSystem *sys;
const MDeformVert *dvert = nullptr;
const MDeformVert *dv = nullptr;
float w, wpaint;
int i, iter;
int defgrp_index;
const bool invert_vgroup = (smd->flag & MOD_LAPLACIANSMOOTH_INVERT_VGROUP) != 0;
sys = init_laplacian_system(mesh->totedge, mesh->totloop, verts_num);
if (!sys) {
return;
}
sys->edges = mesh->edges();
sys->polys = mesh->polys();
sys->corner_verts = mesh->corner_verts();
sys->vertexCos = vertexCos;
sys->min_area = 0.00001f;
MOD_get_vgroup(ob, mesh, smd->defgrp_name, &dvert, &defgrp_index);
sys->vert_centroid[0] = 0.0f;
sys->vert_centroid[1] = 0.0f;
sys->vert_centroid[2] = 0.0f;
memset_laplacian_system(sys, 0);
sys->context = EIG_linear_least_squares_solver_new(verts_num, verts_num, 3);
init_laplacian_matrix(sys);
for (iter = 0; iter < smd->repeat; iter++) {
for (i = 0; i < verts_num; i++) {
EIG_linear_solver_variable_set(sys->context, 0, i, vertexCos[i][0]);
EIG_linear_solver_variable_set(sys->context, 1, i, vertexCos[i][1]);
EIG_linear_solver_variable_set(sys->context, 2, i, vertexCos[i][2]);
if (iter == 0) {
add_v3_v3(sys->vert_centroid, vertexCos[i]);
}
}
if (iter == 0 && verts_num > 0) {
mul_v3_fl(sys->vert_centroid, 1.0f / float(verts_num));
}
dv = dvert;
for (i = 0; i < verts_num; i++) {
EIG_linear_solver_right_hand_side_add(sys->context, 0, i, vertexCos[i][0]);
EIG_linear_solver_right_hand_side_add(sys->context, 1, i, vertexCos[i][1]);
EIG_linear_solver_right_hand_side_add(sys->context, 2, i, vertexCos[i][2]);
if (iter == 0) {
if (dv) {
wpaint = invert_vgroup ? 1.0f - BKE_defvert_find_weight(dv, defgrp_index) :
BKE_defvert_find_weight(dv, defgrp_index);
dv++;
}
else {
wpaint = 1.0f;
}
if (sys->zerola[i] == false) {
if (smd->flag & MOD_LAPLACIANSMOOTH_NORMALIZED) {
w = sys->vweights[i];
sys->vweights[i] = (w == 0.0f) ? 0.0f : -fabsf(smd->lambda) * wpaint / w;
w = sys->vlengths[i];
sys->vlengths[i] = (w == 0.0f) ? 0.0f : -fabsf(smd->lambda_border) * wpaint * 2.0f / w;
if (sys->ne_ed_num[i] == sys->ne_fa_num[i]) {
EIG_linear_solver_matrix_add(sys->context, i, i, 1.0f + fabsf(smd->lambda) * wpaint);
}
else {
EIG_linear_solver_matrix_add(
sys->context, i, i, 1.0f + fabsf(smd->lambda_border) * wpaint * 2.0f);
}
}
else {
w = sys->vweights[i] * sys->ring_areas[i];
sys->vweights[i] = (w == 0.0f) ? 0.0f : -fabsf(smd->lambda) * wpaint / (4.0f * w);
w = sys->vlengths[i];
sys->vlengths[i] = (w == 0.0f) ? 0.0f : -fabsf(smd->lambda_border) * wpaint * 2.0f / w;
if (sys->ne_ed_num[i] == sys->ne_fa_num[i]) {
EIG_linear_solver_matrix_add(sys->context,
i,
i,
1.0f + fabsf(smd->lambda) * wpaint /
(4.0f * sys->ring_areas[i]));
}
else {
EIG_linear_solver_matrix_add(
sys->context, i, i, 1.0f + fabsf(smd->lambda_border) * wpaint * 2.0f);
}
}
}
else {
EIG_linear_solver_matrix_add(sys->context, i, i, 1.0f);
}
}
}
if (iter == 0) {
fill_laplacian_matrix(sys);
}
if (EIG_linear_solver_solve(sys->context)) {
validate_solution(sys, smd->flag, smd->lambda, smd->lambda_border);
}
}
EIG_linear_solver_delete(sys->context);
sys->context = nullptr;
delete_laplacian_system(sys);
}
static void init_data(ModifierData *md)
{
LaplacianSmoothModifierData *smd = (LaplacianSmoothModifierData *)md;
BLI_assert(MEMCMP_STRUCT_AFTER_IS_ZERO(smd, modifier));
MEMCPY_STRUCT_AFTER(smd, DNA_struct_default_get(LaplacianSmoothModifierData), modifier);
}
static bool is_disabled(const Scene * /*scene*/, ModifierData *md, bool /*useRenderParams*/)
{
LaplacianSmoothModifierData *smd = (LaplacianSmoothModifierData *)md;
short flag;
flag = smd->flag & (MOD_LAPLACIANSMOOTH_X | MOD_LAPLACIANSMOOTH_Y | MOD_LAPLACIANSMOOTH_Z);
/* disable if modifier is off for X, Y and Z or if factor is 0 */
if (flag == 0) {
return 1;
}
return 0;
}
static void required_data_mask(ModifierData *md, CustomData_MeshMasks *r_cddata_masks)
{
LaplacianSmoothModifierData *smd = (LaplacianSmoothModifierData *)md;
/* ask for vertexgroups if we need them */
if (smd->defgrp_name[0] != '\0') {
r_cddata_masks->vmask |= CD_MASK_MDEFORMVERT;
}
}
static void deformVerts(ModifierData *md,
const ModifierEvalContext *ctx,
Mesh *mesh,
float (*vertexCos)[3],
int verts_num)
{
Mesh *mesh_src;
if (verts_num == 0) {
return;
}
mesh_src = MOD_deform_mesh_eval_get(ctx->object, nullptr, mesh, nullptr, verts_num, false);
laplaciansmoothModifier_do(
(LaplacianSmoothModifierData *)md, ctx->object, mesh_src, vertexCos, verts_num);
if (!ELEM(mesh_src, nullptr, mesh)) {
BKE_id_free(nullptr, mesh_src);
}
}
static void deformVertsEM(ModifierData *md,
const ModifierEvalContext *ctx,
BMEditMesh *editData,
Mesh *mesh,
float (*vertexCos)[3],
int verts_num)
{
Mesh *mesh_src;
if (verts_num == 0) {
return;
}
mesh_src = MOD_deform_mesh_eval_get(ctx->object, editData, mesh, nullptr, verts_num, false);
/* TODO(@ideasman42): use edit-mode data only (remove this line). */
if (mesh_src != nullptr) {
BKE_mesh_wrapper_ensure_mdata(mesh_src);
}
laplaciansmoothModifier_do(
(LaplacianSmoothModifierData *)md, ctx->object, mesh_src, vertexCos, verts_num);
if (!ELEM(mesh_src, nullptr, mesh)) {
BKE_id_free(nullptr, mesh_src);
}
}
static void panel_draw(const bContext * /*C*/, Panel *panel)
{
uiLayout *row;
uiLayout *layout = panel->layout;
int toggles_flag = UI_ITEM_R_TOGGLE | UI_ITEM_R_FORCE_BLANK_DECORATE;
PointerRNA ob_ptr;
PointerRNA *ptr = modifier_panel_get_property_pointers(panel, &ob_ptr);
uiLayoutSetPropSep(layout, true);
uiItemR(layout, ptr, "iterations", 0, nullptr, ICON_NONE);
row = uiLayoutRowWithHeading(layout, true, IFACE_("Axis"));
uiItemR(row, ptr, "use_x", toggles_flag, nullptr, ICON_NONE);
uiItemR(row, ptr, "use_y", toggles_flag, nullptr, ICON_NONE);
uiItemR(row, ptr, "use_z", toggles_flag, nullptr, ICON_NONE);
uiItemR(layout, ptr, "lambda_factor", 0, nullptr, ICON_NONE);
uiItemR(layout, ptr, "lambda_border", 0, nullptr, ICON_NONE);
uiItemR(layout, ptr, "use_volume_preserve", 0, nullptr, ICON_NONE);
uiItemR(layout, ptr, "use_normalized", 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_LaplacianSmooth, panel_draw);
}
ModifierTypeInfo modifierType_LaplacianSmooth = {
/*name*/ N_("LaplacianSmooth"),
/*structName*/ "LaplacianSmoothModifierData",
/*structSize*/ sizeof(LaplacianSmoothModifierData),
/*srna*/ &RNA_LaplacianSmoothModifier,
/*type*/ eModifierTypeType_OnlyDeform,
/*flags*/ eModifierTypeFlag_AcceptsMesh | eModifierTypeFlag_SupportsEditmode,
/*icon*/ ICON_MOD_SMOOTH,
/*copyData*/ BKE_modifier_copydata_generic,
/*deformVerts*/ deformVerts,
/*deformMatrices*/ nullptr,
/*deformVertsEM*/ deformVertsEM,
/*deformMatricesEM*/ nullptr,
/*modifyMesh*/ nullptr,
/*modifyGeometrySet*/ nullptr,
/*initData*/ init_data,
/*requiredDataMask*/ required_data_mask,
/*freeData*/ nullptr,
/*isDisabled*/ is_disabled,
/*updateDepsgraph*/ nullptr,
/*dependsOnTime*/ nullptr,
/*dependsOnNormals*/ nullptr,
/*foreachIDLink*/ nullptr,
/*foreachTexLink*/ nullptr,
/*freeRuntimeData*/ nullptr,
/*panelRegister*/ panelRegister,
/*blendWrite*/ nullptr,
/*blendRead*/ nullptr,
};
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