tmaq
/
tornavis
1
0
Fork 0
Code Issues 2 Pull Requests 29 Packages Projects 24 Releases Wiki Activity
tornavis/source/blender/blenkernel/intern/shrinkwrap.c

1581 lines
50 KiB
C
Raw Blame History

/*
* 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.
*
* The Original Code is Copyright (C) Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup bke
*/
#include <float.h>
#include <math.h>
#include <memory.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "BLI_math.h"
#include "BLI_math_solvers.h"
#include "BLI_task.h"
#include "BLI_utildefines.h"
#include "BKE_DerivedMesh.h"
#include "BKE_cdderivedmesh.h"
#include "BKE_context.h"
#include "BKE_lattice.h"
#include "BKE_lib_id.h"
#include "BKE_modifier.h"
#include "BKE_shrinkwrap.h"
#include "BKE_deform.h"
#include "BKE_editmesh.h"
#include "BKE_mesh.h" /* for OMP limits. */
#include "BKE_mesh_runtime.h"
#include "BKE_mesh_wrapper.h"
#include "BKE_subsurf.h"
#include "DEG_depsgraph_query.h"
#include "MEM_guardedalloc.h"
#include "BLI_strict_flags.h"
/* for timing... */
#if 0
# include "PIL_time_utildefines.h"
#else
# define TIMEIT_BENCH(expr, id) (expr)
#endif
/* Util macros */
#define OUT_OF_MEMORY() ((void)printf("Shrinkwrap: Out of memory\n"))
typedef struct ShrinkwrapCalcData {
ShrinkwrapModifierData *smd; /* shrinkwrap modifier data */
struct Object *ob; /* object we are applying shrinkwrap to */
struct MVert *vert; /* Array of verts being projected (to fetch normals or other data) */
float (*vertexCos)[3]; /* vertexs being shrinkwraped */
int numVerts;
struct MDeformVert *dvert; /* Pointer to mdeform array */
int vgroup; /* Vertex group num */
bool invert_vgroup; /* invert vertex group influence */
struct Mesh *target; /* mesh we are shrinking to */
struct SpaceTransform local2target; /* transform to move between local and target space */
struct ShrinkwrapTreeData *tree; /* mesh BVH tree data */
struct Object *aux_target;
float keepDist; /* Distance to keep above target surface (units are in local space) */
} ShrinkwrapCalcData;
typedef struct ShrinkwrapCalcCBData {
ShrinkwrapCalcData *calc;
ShrinkwrapTreeData *tree;
ShrinkwrapTreeData *aux_tree;
float *proj_axis;
SpaceTransform *local2aux;
} ShrinkwrapCalcCBData;
/* Checks if the modifier needs target normals with these settings. */
bool BKE_shrinkwrap_needs_normals(int shrinkType, int shrinkMode)
{
return (shrinkType == MOD_SHRINKWRAP_TARGET_PROJECT) ||
(shrinkType != MOD_SHRINKWRAP_NEAREST_VERTEX &&
shrinkMode == MOD_SHRINKWRAP_ABOVE_SURFACE);
}
/* Initializes the mesh data structure from the given mesh and settings. */
bool BKE_shrinkwrap_init_tree(
ShrinkwrapTreeData *data, Mesh *mesh, int shrinkType, int shrinkMode, bool force_normals)
{
memset(data, 0, sizeof(*data));
if (mesh == NULL) {
return false;
}
/* We could create a BVH tree from the edit mesh,
* however accessing normals from the face/loop normals gets more involved.
* Convert mesh data since this isn't typically used in edit-mode. */
BKE_mesh_wrapper_ensure_mdata(mesh);
if (mesh->totvert <= 0) {
return false;
}
data->mesh = mesh;
if (shrinkType == MOD_SHRINKWRAP_NEAREST_VERTEX) {
data->bvh = BKE_bvhtree_from_mesh_get(&data->treeData, mesh, BVHTREE_FROM_VERTS, 2);
return data->bvh != NULL;
}
if (mesh->totpoly <= 0) {
return false;
}
data->bvh = BKE_bvhtree_from_mesh_get(&data->treeData, mesh, BVHTREE_FROM_LOOPTRI, 4);
if (data->bvh == NULL) {
return false;
}
if (force_normals || BKE_shrinkwrap_needs_normals(shrinkType, shrinkMode)) {
data->pnors = CustomData_get_layer(&mesh->pdata, CD_NORMAL);
if ((mesh->flag & ME_AUTOSMOOTH) != 0) {
data->clnors = CustomData_get_layer(&mesh->ldata, CD_NORMAL);
}
}
if (shrinkType == MOD_SHRINKWRAP_TARGET_PROJECT) {
data->boundary = mesh->runtime.shrinkwrap_data;
}
return true;
}
/* Frees the tree data if necessary. */
void BKE_shrinkwrap_free_tree(ShrinkwrapTreeData *data)
{
free_bvhtree_from_mesh(&data->treeData);
}
/* Free boundary data for target project */
void BKE_shrinkwrap_discard_boundary_data(struct Mesh *mesh)
{
struct ShrinkwrapBoundaryData *data = mesh->runtime.shrinkwrap_data;
if (data != NULL) {
MEM_freeN((void *)data->edge_is_boundary);
MEM_freeN((void *)data->looptri_has_boundary);
MEM_freeN((void *)data->vert_boundary_id);
MEM_freeN((void *)data->boundary_verts);
MEM_freeN(data);
}
mesh->runtime.shrinkwrap_data = NULL;
}
/* Accumulate edge for average boundary edge direction. */
static void merge_vert_dir(ShrinkwrapBoundaryVertData *vdata,
signed char *status,
int index,
const float edge_dir[3],
signed char side)
{
BLI_assert(index >= 0);
float *direction = vdata[index].direction;
/* Invert the direction vector if either:
* - This is the second edge and both edges have the vertex as start or end.
* - For third and above, if it points in the wrong direction.
*/
if (status[index] >= 0 ? status[index] == side : dot_v3v3(direction, edge_dir) < 0) {
sub_v3_v3(direction, edge_dir);
}
else {
add_v3_v3(direction, edge_dir);
}
status[index] = (status[index] == 0) ? side : -1;
}
static ShrinkwrapBoundaryData *shrinkwrap_build_boundary_data(struct Mesh *mesh)
{
const MLoop *mloop = mesh->mloop;
const MEdge *medge = mesh->medge;
const MVert *mvert = mesh->mvert;
/* Count faces per edge (up to 2). */
char *edge_mode = MEM_calloc_arrayN((size_t)mesh->totedge, sizeof(char), __func__);
for (int i = 0; i < mesh->totloop; i++) {
unsigned int eidx = mloop[i].e;
if (edge_mode[eidx] < 2) {
edge_mode[eidx]++;
}
}
/* Build the boundary edge bitmask. */
BLI_bitmap *edge_is_boundary = BLI_BITMAP_NEW(mesh->totedge,
"ShrinkwrapBoundaryData::edge_is_boundary");
unsigned int num_boundary_edges = 0;
for (int i = 0; i < mesh->totedge; i++) {
edge_mode[i] = (edge_mode[i] == 1);
if (edge_mode[i]) {
BLI_BITMAP_ENABLE(edge_is_boundary, i);
num_boundary_edges++;
}
}
/* If no boundary, return NULL. */
if (num_boundary_edges == 0) {
MEM_freeN(edge_is_boundary);
MEM_freeN(edge_mode);
return NULL;
}
/* Allocate the data object. */
ShrinkwrapBoundaryData *data = MEM_callocN(sizeof(ShrinkwrapBoundaryData),
"ShrinkwrapBoundaryData");
data->edge_is_boundary = edge_is_boundary;
/* Build the boundary looptri bitmask. */
const MLoopTri *mlooptri = BKE_mesh_runtime_looptri_ensure(mesh);
int totlooptri = BKE_mesh_runtime_looptri_len(mesh);
BLI_bitmap *looptri_has_boundary = BLI_BITMAP_NEW(totlooptri,
"ShrinkwrapBoundaryData::looptri_is_boundary");
for (int i = 0; i < totlooptri; i++) {
int edges[3];
BKE_mesh_looptri_get_real_edges(mesh, &mlooptri[i], edges);
for (int j = 0; j < 3; j++) {
if (edges[j] >= 0 && edge_mode[edges[j]]) {
BLI_BITMAP_ENABLE(looptri_has_boundary, i);
break;
}
}
}
data->looptri_has_boundary = looptri_has_boundary;
/* Find boundary vertices and build a mapping table for compact storage of data. */
int *vert_boundary_id = MEM_calloc_arrayN(
(size_t)mesh->totvert, sizeof(int), "ShrinkwrapBoundaryData::vert_boundary_id");
for (int i = 0; i < mesh->totedge; i++) {
if (edge_mode[i]) {
const MEdge *edge = &medge[i];
vert_boundary_id[edge->v1] = 1;
vert_boundary_id[edge->v2] = 1;
}
}
unsigned int num_boundary_verts = 0;
for (int i = 0; i < mesh->totvert; i++) {
vert_boundary_id[i] = (vert_boundary_id[i] != 0) ? (int)num_boundary_verts++ : -1;
}
data->vert_boundary_id = vert_boundary_id;
data->num_boundary_verts = num_boundary_verts;
/* Compute average directions. */
ShrinkwrapBoundaryVertData *boundary_verts = MEM_calloc_arrayN(
num_boundary_verts, sizeof(*boundary_verts), "ShrinkwrapBoundaryData::boundary_verts");
signed char *vert_status = MEM_calloc_arrayN(num_boundary_verts, sizeof(char), __func__);
for (int i = 0; i < mesh->totedge; i++) {
if (edge_mode[i]) {
const MEdge *edge = &medge[i];
float dir[3];
sub_v3_v3v3(dir, mvert[edge->v2].co, mvert[edge->v1].co);
normalize_v3(dir);
merge_vert_dir(boundary_verts, vert_status, vert_boundary_id[edge->v1], dir, 1);
merge_vert_dir(boundary_verts, vert_status, vert_boundary_id[edge->v2], dir, 2);
}
}
MEM_freeN(vert_status);
/* Finalize average direction and compute normal. */
for (int i = 0; i < mesh->totvert; i++) {
int bidx = vert_boundary_id[i];
if (bidx >= 0) {
ShrinkwrapBoundaryVertData *vdata = &boundary_verts[bidx];
float no[3], tmp[3];
normalize_v3(vdata->direction);
normal_short_to_float_v3(no, mesh->mvert[i].no);
cross_v3_v3v3(tmp, no, vdata->direction);
cross_v3_v3v3(vdata->normal_plane, tmp, no);
normalize_v3(vdata->normal_plane);
}
}
data->boundary_verts = boundary_verts;
MEM_freeN(edge_mode);
return data;
}
void BKE_shrinkwrap_compute_boundary_data(struct Mesh *mesh)
{
BKE_shrinkwrap_discard_boundary_data(mesh);
mesh->runtime.shrinkwrap_data = shrinkwrap_build_boundary_data(mesh);
}
/**
* Shrink-wrap to the nearest vertex
*
* it builds a #BVHTree of vertices we can attach to and then
* for each vertex performs a nearest vertex search on the tree
*/
static void shrinkwrap_calc_nearest_vertex_cb_ex(void *__restrict userdata,
const int i,
const TaskParallelTLS *__restrict tls)
{
ShrinkwrapCalcCBData *data = userdata;
ShrinkwrapCalcData *calc = data->calc;
BVHTreeFromMesh *treeData = &data->tree->treeData;
BVHTreeNearest *nearest = tls->userdata_chunk;
float *co = calc->vertexCos[i];
float tmp_co[3];
float weight = BKE_defvert_array_find_weight_safe(calc->dvert, i, calc->vgroup);
if (calc->invert_vgroup) {
weight = 1.0f - weight;
}
if (weight == 0.0f) {
return;
}
/* Convert the vertex to tree coordinates */
if (calc->vert) {
copy_v3_v3(tmp_co, calc->vert[i].co);
}
else {
copy_v3_v3(tmp_co, co);
}
BLI_space_transform_apply(&calc->local2target, tmp_co);
/* Use local proximity heuristics (to reduce the nearest search)
*
* If we already had an hit before.. we assume this vertex is going to have a close hit to that
* other vertex so we can initiate the "nearest.dist" with the expected value to that last hit.
* This will lead in pruning of the search tree. */
if (nearest->index != -1) {
nearest->dist_sq = len_squared_v3v3(tmp_co, nearest->co);
}
else {
nearest->dist_sq = FLT_MAX;
}
BLI_bvhtree_find_nearest(treeData->tree, tmp_co, nearest, treeData->nearest_callback, treeData);
/* Found the nearest vertex */
if (nearest->index != -1) {
/* Adjusting the vertex weight,
* so that after interpolating it keeps a certain distance from the nearest position */
if (nearest->dist_sq > FLT_EPSILON) {
const float dist = sqrtf(nearest->dist_sq);
weight *= (dist - calc->keepDist) / dist;
}
/* Convert the coordinates back to mesh coordinates */
copy_v3_v3(tmp_co, nearest->co);
BLI_space_transform_invert(&calc->local2target, tmp_co);
interp_v3_v3v3(co, co, tmp_co, weight); /* linear interpolation */
}
}
static void shrinkwrap_calc_nearest_vertex(ShrinkwrapCalcData *calc)
{
BVHTreeNearest nearest = NULL_BVHTreeNearest;
/* Setup nearest */
nearest.index = -1;
nearest.dist_sq = FLT_MAX;
ShrinkwrapCalcCBData data = {
.calc = calc,
.tree = calc->tree,
};
TaskParallelSettings settings;
BLI_parallel_range_settings_defaults(&settings);
settings.use_threading = (calc->numVerts > BKE_MESH_OMP_LIMIT);
settings.userdata_chunk = &nearest;
settings.userdata_chunk_size = sizeof(nearest);
BLI_task_parallel_range(
0, calc->numVerts, &data, shrinkwrap_calc_nearest_vertex_cb_ex, &settings);
}
/*
* This function raycast a single vertex and updates the hit if the "hit" is considered valid.
* Returns true if "hit" was updated.
* Opts control whether an hit is valid or not
* Supported options are:
* - MOD_SHRINKWRAP_CULL_TARGET_FRONTFACE (front faces hits are ignored)
* - MOD_SHRINKWRAP_CULL_TARGET_BACKFACE (back faces hits are ignored)
*/
bool BKE_shrinkwrap_project_normal(char options,
const float vert[3],
const float dir[3],
const float ray_radius,
const SpaceTransform *transf,
ShrinkwrapTreeData *tree,
BVHTreeRayHit *hit)
{
/* don't use this because this dist value could be incompatible
* this value used by the callback for comparing previous/new dist values.
* also, at the moment there is no need to have a corrected 'dist' value */
// #define USE_DIST_CORRECT
float tmp_co[3], tmp_no[3];
const float *co, *no;
BVHTreeRayHit hit_tmp;
/* Copy from hit (we need to convert hit rays from one space coordinates to the other */
memcpy(&hit_tmp, hit, sizeof(hit_tmp));
/* Apply space transform (TODO readjust dist) */
if (transf) {
copy_v3_v3(tmp_co, vert);
BLI_space_transform_apply(transf, tmp_co);
co = tmp_co;
copy_v3_v3(tmp_no, dir);
BLI_space_transform_apply_normal(transf, tmp_no);
no = tmp_no;
#ifdef USE_DIST_CORRECT
hit_tmp.dist *= mat4_to_scale(((SpaceTransform *)transf)->local2target);
#endif
}
else {
co = vert;
no = dir;
}
hit_tmp.index = -1;
BLI_bvhtree_ray_cast(
tree->bvh, co, no, ray_radius, &hit_tmp, tree->treeData.raycast_callback, &tree->treeData);
if (hit_tmp.index != -1) {
/* invert the normal first so face culling works on rotated objects */
if (transf) {
BLI_space_transform_invert_normal(transf, hit_tmp.no);
}
if (options & MOD_SHRINKWRAP_CULL_TARGET_MASK) {
/* Apply back-face. */
const float dot = dot_v3v3(dir, hit_tmp.no);
if (((options & MOD_SHRINKWRAP_CULL_TARGET_FRONTFACE) && dot <= 0.0f) ||
((options & MOD_SHRINKWRAP_CULL_TARGET_BACKFACE) && dot >= 0.0f)) {
return false; /* Ignore hit */
}
}
if (transf) {
/* Inverting space transform (TODO: make coherent with the initial dist readjust). */
BLI_space_transform_invert(transf, hit_tmp.co);
#ifdef USE_DIST_CORRECT
hit_tmp.dist = len_v3v3(vert, hit_tmp.co);
#endif
}
BLI_assert(hit_tmp.dist <= hit->dist);
memcpy(hit, &hit_tmp, sizeof(hit_tmp));
return true;
}
return false;
}
static void shrinkwrap_calc_normal_projection_cb_ex(void *__restrict userdata,
const int i,
const TaskParallelTLS *__restrict tls)
{
ShrinkwrapCalcCBData *data = userdata;
ShrinkwrapCalcData *calc = data->calc;
ShrinkwrapTreeData *tree = data->tree;
ShrinkwrapTreeData *aux_tree = data->aux_tree;
float *proj_axis = data->proj_axis;
SpaceTransform *local2aux = data->local2aux;
BVHTreeRayHit *hit = tls->userdata_chunk;
const float proj_limit_squared = calc->smd->projLimit * calc->smd->projLimit;
float *co = calc->vertexCos[i];
float tmp_co[3], tmp_no[3];
float weight = BKE_defvert_array_find_weight_safe(calc->dvert, i, calc->vgroup);
if (calc->invert_vgroup) {
weight = 1.0f - weight;
}
if (weight == 0.0f) {
return;
}
if (calc->vert != NULL && calc->smd->projAxis == MOD_SHRINKWRAP_PROJECT_OVER_NORMAL) {
/* calc->vert contains verts from evaluated mesh. */
/* These coordinates are deformed by vertexCos only for normal projection
* (to get correct normals) for other cases calc->verts contains undeformed coordinates and
* vertexCos should be used */
copy_v3_v3(tmp_co, calc->vert[i].co);
normal_short_to_float_v3(tmp_no, calc->vert[i].no);
}
else {
copy_v3_v3(tmp_co, co);
copy_v3_v3(tmp_no, proj_axis);
}
hit->index = -1;
/* TODO: we should use FLT_MAX here, but sweepsphere code isn't prepared for that */
hit->dist = BVH_RAYCAST_DIST_MAX;
bool is_aux = false;
/* Project over positive direction of axis */
if (calc->smd->shrinkOpts & MOD_SHRINKWRAP_PROJECT_ALLOW_POS_DIR) {
if (aux_tree) {
if (BKE_shrinkwrap_project_normal(0, tmp_co, tmp_no, 0.0, local2aux, aux_tree, hit)) {
is_aux = true;
}
}
if (BKE_shrinkwrap_project_normal(
calc->smd->shrinkOpts, tmp_co, tmp_no, 0.0, &calc->local2target, tree, hit)) {
is_aux = false;
}
}
/* Project over negative direction of axis */
if (calc->smd->shrinkOpts & MOD_SHRINKWRAP_PROJECT_ALLOW_NEG_DIR) {
float inv_no[3];
negate_v3_v3(inv_no, tmp_no);
char options = calc->smd->shrinkOpts;
if ((options & MOD_SHRINKWRAP_INVERT_CULL_TARGET) &&
(options & MOD_SHRINKWRAP_CULL_TARGET_MASK)) {
options ^= MOD_SHRINKWRAP_CULL_TARGET_MASK;
}
if (aux_tree) {
if (BKE_shrinkwrap_project_normal(0, tmp_co, inv_no, 0.0, local2aux, aux_tree, hit)) {
is_aux = true;
}
}
if (BKE_shrinkwrap_project_normal(
options, tmp_co, inv_no, 0.0, &calc->local2target, tree, hit)) {
is_aux = false;
}
}
/* don't set the initial dist (which is more efficient),
* because its calculated in the targets space, we want the dist in our own space */
if (proj_limit_squared != 0.0f) {
if (hit->index != -1 && len_squared_v3v3(hit->co, co) > proj_limit_squared) {
hit->index = -1;
}
}
if (hit->index != -1) {
if (is_aux) {
BKE_shrinkwrap_snap_point_to_surface(aux_tree,
local2aux,
calc->smd->shrinkMode,
hit->index,
hit->co,
hit->no,
calc->keepDist,
tmp_co,
hit->co);
}
else {
BKE_shrinkwrap_snap_point_to_surface(tree,
&calc->local2target,
calc->smd->shrinkMode,
hit->index,
hit->co,
hit->no,
calc->keepDist,
tmp_co,
hit->co);
}
interp_v3_v3v3(co, co, hit->co, weight);
}
}
static void shrinkwrap_calc_normal_projection(ShrinkwrapCalcData *calc)
{
/* Options about projection direction */
float proj_axis[3] = {0.0f, 0.0f, 0.0f};
/* Ray-cast and tree stuff. */
/** \note 'hit.dist' is kept in the targets space, this is only used
* for finding the best hit, to get the real dist,
* measure the len_v3v3() from the input coord to hit.co */
BVHTreeRayHit hit;
/* auxiliary target */
Mesh *auxMesh = NULL;
ShrinkwrapTreeData *aux_tree = NULL;
ShrinkwrapTreeData aux_tree_stack;
SpaceTransform local2aux;
/* If the user doesn't allows to project in any direction of projection axis
* then there's nothing todo. */
if ((calc->smd->shrinkOpts &
(MOD_SHRINKWRAP_PROJECT_ALLOW_POS_DIR | MOD_SHRINKWRAP_PROJECT_ALLOW_NEG_DIR)) == 0) {
return;
}
/* Prepare data to retrieve the direction in which we should project each vertex */
if (calc->smd->projAxis == MOD_SHRINKWRAP_PROJECT_OVER_NORMAL) {
if (calc->vert == NULL) {
return;
}
}
else {
/* The code supports any axis that is a combination of X,Y,Z
* although currently UI only allows to set the 3 different axis */
if (calc->smd->projAxis & MOD_SHRINKWRAP_PROJECT_OVER_X_AXIS) {
proj_axis[0] = 1.0f;
}
if (calc->smd->projAxis & MOD_SHRINKWRAP_PROJECT_OVER_Y_AXIS) {
proj_axis[1] = 1.0f;
}
if (calc->smd->projAxis & MOD_SHRINKWRAP_PROJECT_OVER_Z_AXIS) {
proj_axis[2] = 1.0f;
}
normalize_v3(proj_axis);
/* Invalid projection direction */
if (len_squared_v3(proj_axis) < FLT_EPSILON) {
return;
}
}
if (calc->aux_target) {
auxMesh = BKE_modifier_get_evaluated_mesh_from_evaluated_object(calc->aux_target, false);
if (!auxMesh) {
return;
}
BLI_SPACE_TRANSFORM_SETUP(&local2aux, calc->ob, calc->aux_target);
}
if (BKE_shrinkwrap_init_tree(
&aux_tree_stack, auxMesh, calc->smd->shrinkType, calc->smd->shrinkMode, false)) {
aux_tree = &aux_tree_stack;
}
/* After successfully build the trees, start projection vertices. */
ShrinkwrapCalcCBData data = {
.calc = calc,
.tree = calc->tree,
.aux_tree = aux_tree,
.proj_axis = proj_axis,
.local2aux = &local2aux,
};
TaskParallelSettings settings;
BLI_parallel_range_settings_defaults(&settings);
settings.use_threading = (calc->numVerts > BKE_MESH_OMP_LIMIT);
settings.userdata_chunk = &hit;
settings.userdata_chunk_size = sizeof(hit);
BLI_task_parallel_range(
0, calc->numVerts, &data, shrinkwrap_calc_normal_projection_cb_ex, &settings);
/* free data structures */
if (aux_tree) {
BKE_shrinkwrap_free_tree(aux_tree);
}
}
/*
* Shrinkwrap Target Surface Project mode
*
* It uses Newton's method to find a surface location with its
* smooth normal pointing at the original point.
*
* The equation system on barycentric weights and normal multiplier:
*
* (w0*V0 + w1*V1 + w2*V2) + l * (w0*N0 + w1*N1 + w2*N2) - CO = 0
* w0 + w1 + w2 = 1
*
* The actual solution vector is [ w0, w1, l ], with w2 eliminated.
*/
//#define TRACE_TARGET_PROJECT
typedef struct TargetProjectTriData {
const float **vtri_co;
const float (*vtri_no)[3];
const float *point_co;
float n0_minus_n2[3], n1_minus_n2[3];
float c0_minus_c2[3], c1_minus_c2[3];
/* Current interpolated position and normal. */
float co_interp[3], no_interp[3];
} TargetProjectTriData;
/* Computes the deviation of the equation system from goal. */
static void target_project_tri_deviation(void *userdata, const float x[3], float r_delta[3])
{
TargetProjectTriData *data = userdata;
const float w[3] = {x[0], x[1], 1.0f - x[0] - x[1]};
interp_v3_v3v3v3(data->co_interp, data->vtri_co[0], data->vtri_co[1], data->vtri_co[2], w);
interp_v3_v3v3v3(data->no_interp, data->vtri_no[0], data->vtri_no[1], data->vtri_no[2], w);
madd_v3_v3v3fl(r_delta, data->co_interp, data->no_interp, x[2]);
sub_v3_v3(r_delta, data->point_co);
}
/* Computes the Jacobian matrix of the equation system. */
static void target_project_tri_jacobian(void *userdata, const float x[3], float r_jacobian[3][3])
{
TargetProjectTriData *data = userdata;
madd_v3_v3v3fl(r_jacobian[0], data->c0_minus_c2, data->n0_minus_n2, x[2]);
madd_v3_v3v3fl(r_jacobian[1], data->c1_minus_c2, data->n1_minus_n2, x[2]);
copy_v3_v3(r_jacobian[2], data->vtri_no[2]);
madd_v3_v3fl(r_jacobian[2], data->n0_minus_n2, x[0]);
madd_v3_v3fl(r_jacobian[2], data->n1_minus_n2, x[1]);
}
/* Clamp barycentric weights to the triangle. */
static void target_project_tri_clamp(float x[3])
{
if (x[0] < 0.0f) {
x[0] = 0.0f;
}
if (x[1] < 0.0f) {
x[1] = 0.0f;
}
if (x[0] + x[1] > 1.0f) {
x[0] = x[0] / (x[0] + x[1]);
x[1] = 1.0f - x[0];
}
}
/* Correct the Newton's method step to keep the coordinates within the triangle. */
static bool target_project_tri_correct(void *UNUSED(userdata),
const float x[3],
float step[3],
float x_next[3])
{
/* Insignificant correction threshold */
const float epsilon = 1e-5f;
/* Dot product threshold for checking if step is 'clearly' pointing outside. */
const float dir_epsilon = 0.5f;
bool fixed = false, locked = false;
/* The barycentric coordinate domain is a triangle bounded by
* the X and Y axes, plus the x+y=1 diagonal. First, clamp the
* movement against the diagonal. Note that step is subtracted. */
float sum = x[0] + x[1];
float sstep = -(step[0] + step[1]);
if (sum + sstep > 1.0f) {
float ldist = 1.0f - sum;
/* If already at the boundary, slide along it. */
if (ldist < epsilon * (float)M_SQRT2) {
float step_len = len_v2(step);
/* Abort if the solution is clearly outside the domain. */
if (step_len > epsilon && sstep > step_len * dir_epsilon * (float)M_SQRT2) {
return false;
}
/* Project the new position onto the diagonal. */
add_v2_fl(step, (sum + sstep - 1.0f) * 0.5f);
fixed = locked = true;
}
else {
/* Scale a significant step down to arrive at the boundary. */
mul_v3_fl(step, ldist / sstep);
fixed = true;
}
}
/* Weight 0 and 1 boundary checks - along axis. */
for (int i = 0; i < 2; i++) {
if (step[i] > x[i]) {
/* If already at the boundary, slide along it. */
if (x[i] < epsilon) {
float step_len = len_v2(step);
/* Abort if the solution is clearly outside the domain. */
if (step_len > epsilon && (locked || step[i] > step_len * dir_epsilon)) {
return false;
}
/* Reset precision errors to stay at the boundary. */
step[i] = x[i];
fixed = true;
}
else {
/* Scale a significant step down to arrive at the boundary. */
mul_v3_fl(step, x[i] / step[i]);
fixed = true;
}
}
}
/* Recompute and clamp the new coordinates after step correction. */
if (fixed) {
sub_v3_v3v3(x_next, x, step);
target_project_tri_clamp(x_next);
}
return true;
}
static bool target_project_solve_point_tri(const float *vtri_co[3],
const float vtri_no[3][3],
const float point_co[3],
const float hit_co[3],
float hit_dist_sq,
float r_hit_co[3],
float r_hit_no[3])
{
float x[3], tmp[3];
float dist = sqrtf(hit_dist_sq);
float magnitude_estimate = dist + len_manhattan_v3(vtri_co[0]) + len_manhattan_v3(vtri_co[1]) +
len_manhattan_v3(vtri_co[2]);
float epsilon = magnitude_estimate * 1.0e-6f;
/* Initial solution vector: barycentric weights plus distance along normal. */
interp_weights_tri_v3(x, UNPACK3(vtri_co), hit_co);
interp_v3_v3v3v3(r_hit_no, UNPACK3(vtri_no), x);
sub_v3_v3v3(tmp, point_co, hit_co);
x[2] = (dot_v3v3(tmp, r_hit_no) < 0) ? -dist : dist;
/* Solve the equations iteratively. */
TargetProjectTriData tri_data = {
.vtri_co = vtri_co,
.vtri_no = vtri_no,
.point_co = point_co,
};
sub_v3_v3v3(tri_data.n0_minus_n2, vtri_no[0], vtri_no[2]);
sub_v3_v3v3(tri_data.n1_minus_n2, vtri_no[1], vtri_no[2]);
sub_v3_v3v3(tri_data.c0_minus_c2, vtri_co[0], vtri_co[2]);
sub_v3_v3v3(tri_data.c1_minus_c2, vtri_co[1], vtri_co[2]);
target_project_tri_clamp(x);
#ifdef TRACE_TARGET_PROJECT
const bool trace = true;
#else
const bool trace = false;
#endif
bool ok = BLI_newton3d_solve(target_project_tri_deviation,
target_project_tri_jacobian,
target_project_tri_correct,
&tri_data,
epsilon,
20,
trace,
x,
x);
if (ok) {
copy_v3_v3(r_hit_co, tri_data.co_interp);
copy_v3_v3(r_hit_no, tri_data.no_interp);
return true;
}
return false;
}
static bool update_hit(BVHTreeNearest *nearest,
int index,
const float co[3],
const float hit_co[3],
const float hit_no[3])
{
float dist_sq = len_squared_v3v3(hit_co, co);
if (dist_sq < nearest->dist_sq) {
#ifdef TRACE_TARGET_PROJECT
printf(
"#=#=#> %d (%.3f,%.3f,%.3f) %g < %g\n", index, UNPACK3(hit_co), dist_sq, nearest->dist_sq);
#endif
nearest->index = index;
nearest->dist_sq = dist_sq;
copy_v3_v3(nearest->co, hit_co);
normalize_v3_v3(nearest->no, hit_no);
return true;
}
return false;
}
/* Target projection on a non-manifold boundary edge -
* treats it like an infinitely thin cylinder. */
static void target_project_edge(const ShrinkwrapTreeData *tree,
int index,
const float co[3],
BVHTreeNearest *nearest,
int eidx)
{
const BVHTreeFromMesh *data = &tree->treeData;
const MEdge *edge = &tree->mesh->medge[eidx];
const float *vedge_co[2] = {data->vert[edge->v1].co, data->vert[edge->v2].co};
#ifdef TRACE_TARGET_PROJECT
printf("EDGE %d (%.3f,%.3f,%.3f) (%.3f,%.3f,%.3f)\n",
eidx,
UNPACK3(vedge_co[0]),
UNPACK3(vedge_co[1]));
#endif
/* Retrieve boundary vertex IDs */
const int *vert_boundary_id = tree->boundary->vert_boundary_id;
int bid1 = vert_boundary_id[edge->v1], bid2 = vert_boundary_id[edge->v2];
if (bid1 < 0 || bid2 < 0) {
return;
}
/* Retrieve boundary vertex normals and align them to direction. */
const ShrinkwrapBoundaryVertData *boundary_verts = tree->boundary->boundary_verts;
float vedge_dir[2][3], dir[3];
copy_v3_v3(vedge_dir[0], boundary_verts[bid1].normal_plane);
copy_v3_v3(vedge_dir[1], boundary_verts[bid2].normal_plane);
sub_v3_v3v3(dir, vedge_co[1], vedge_co[0]);
if (dot_v3v3(boundary_verts[bid1].direction, dir) < 0) {
negate_v3(vedge_dir[0]);
}
if (dot_v3v3(boundary_verts[bid2].direction, dir) < 0) {
negate_v3(vedge_dir[1]);
}
/* Solve a quadratic equation: lerp(d0,d1,x) * (co - lerp(v0,v1,x)) = 0 */
float d0v0 = dot_v3v3(vedge_dir[0], vedge_co[0]), d0v1 = dot_v3v3(vedge_dir[0], vedge_co[1]);
float d1v0 = dot_v3v3(vedge_dir[1], vedge_co[0]), d1v1 = dot_v3v3(vedge_dir[1], vedge_co[1]);
float d0co = dot_v3v3(vedge_dir[0], co);
float a = d0v1 - d0v0 + d1v0 - d1v1;
float b = 2 * d0v0 - d0v1 - d0co - d1v0 + dot_v3v3(vedge_dir[1], co);
float c = d0co - d0v0;
float det = b * b - 4 * a * c;
if (det >= 0) {
const float epsilon = 1e-6f;
float sdet = sqrtf(det);
float hit_co[3], hit_no[3];
for (int i = (det > 0 ? 2 : 0); i >= 0; i -= 2) {
float x = (-b + ((float)i - 1) * sdet) / (2 * a);
if (x >= -epsilon && x <= 1.0f + epsilon) {
CLAMP(x, 0, 1);
float vedge_no[2][3];
normal_short_to_float_v3(vedge_no[0], data->vert[edge->v1].no);
normal_short_to_float_v3(vedge_no[1], data->vert[edge->v2].no);
interp_v3_v3v3(hit_co, vedge_co[0], vedge_co[1], x);
interp_v3_v3v3(hit_no, vedge_no[0], vedge_no[1], x);
update_hit(nearest, index, co, hit_co, hit_no);
}
}
}
}
/* Target normal projection BVH callback - based on mesh_looptri_nearest_point. */
static void mesh_looptri_target_project(void *userdata,
int index,
const float co[3],
BVHTreeNearest *nearest)
{
const ShrinkwrapTreeData *tree = (ShrinkwrapTreeData *)userdata;
const BVHTreeFromMesh *data = &tree->treeData;
const MLoopTri *lt = &data->looptri[index];
const MLoop *loop[3] = {
&data->loop[lt->tri[0]], &data->loop[lt->tri[1]], &data->loop[lt->tri[2]]};
const MVert *vtri[3] = {
&data->vert[loop[0]->v], &data->vert[loop[1]->v], &data->vert[loop[2]->v]};
const float *vtri_co[3] = {vtri[0]->co, vtri[1]->co, vtri[2]->co};
float raw_hit_co[3], hit_co[3], hit_no[3], dist_sq, vtri_no[3][3];
/* First find the closest point and bail out if it's worse than the current solution. */
closest_on_tri_to_point_v3(raw_hit_co, co, UNPACK3(vtri_co));
dist_sq = len_squared_v3v3(co, raw_hit_co);
#ifdef TRACE_TARGET_PROJECT
printf("TRIANGLE %d (%.3f,%.3f,%.3f) (%.3f,%.3f,%.3f) (%.3f,%.3f,%.3f) %g %g\n",
index,
UNPACK3(vtri_co[0]),
UNPACK3(vtri_co[1]),
UNPACK3(vtri_co[2]),
dist_sq,
nearest->dist_sq);
#endif
if (dist_sq >= nearest->dist_sq) {
return;
}
/* Decode normals */
normal_short_to_float_v3(vtri_no[0], vtri[0]->no);
normal_short_to_float_v3(vtri_no[1], vtri[1]->no);
normal_short_to_float_v3(vtri_no[2], vtri[2]->no);
/* Solve the equations for the triangle */
if (target_project_solve_point_tri(vtri_co, vtri_no, co, raw_hit_co, dist_sq, hit_co, hit_no)) {
update_hit(nearest, index, co, hit_co, hit_no);
}
/* Boundary edges */
else if (tree->boundary && BLI_BITMAP_TEST(tree->boundary->looptri_has_boundary, index)) {
const BLI_bitmap *is_boundary = tree->boundary->edge_is_boundary;
int edges[3];
BKE_mesh_looptri_get_real_edges(tree->mesh, lt, edges);
for (int i = 0; i < 3; i++) {
if (edges[i] >= 0 && BLI_BITMAP_TEST(is_boundary, edges[i])) {
target_project_edge(tree, index, co, nearest, edges[i]);
}
}
}
}
/*
* Maps the point to the nearest surface, either by simple nearest, or by target normal projection.
*/
void BKE_shrinkwrap_find_nearest_surface(struct ShrinkwrapTreeData *tree,
BVHTreeNearest *nearest,
float co[3],
int type)
{
BVHTreeFromMesh *treeData = &tree->treeData;
if (type == MOD_SHRINKWRAP_TARGET_PROJECT) {
#ifdef TRACE_TARGET_PROJECT
printf("\n====== TARGET PROJECT START ======\n");
#endif
BLI_bvhtree_find_nearest_ex(
tree->bvh, co, nearest, mesh_looptri_target_project, tree, BVH_NEAREST_OPTIMAL_ORDER);
#ifdef TRACE_TARGET_PROJECT
printf("====== TARGET PROJECT END: %d %g ======\n\n", nearest->index, nearest->dist_sq);
#endif
if (nearest->index < 0) {
/* fallback to simple nearest */
BLI_bvhtree_find_nearest(tree->bvh, co, nearest, treeData->nearest_callback, treeData);
}
}
else {
BLI_bvhtree_find_nearest(tree->bvh, co, nearest, treeData->nearest_callback, treeData);
}
}
/*
* Shrinkwrap moving vertexs to the nearest surface point on the target
*
* it builds a BVHTree from the target mesh and then performs a
* NN matches for each vertex
*/
static void shrinkwrap_calc_nearest_surface_point_cb_ex(void *__restrict userdata,
const int i,
const TaskParallelTLS *__restrict tls)
{
ShrinkwrapCalcCBData *data = userdata;
ShrinkwrapCalcData *calc = data->calc;
BVHTreeNearest *nearest = tls->userdata_chunk;
float *co = calc->vertexCos[i];
float tmp_co[3];
float weight = BKE_defvert_array_find_weight_safe(calc->dvert, i, calc->vgroup);
if (calc->invert_vgroup) {
weight = 1.0f - weight;
}
if (weight == 0.0f) {
return;
}
/* Convert the vertex to tree coordinates */
if (calc->vert) {
copy_v3_v3(tmp_co, calc->vert[i].co);
}
else {
copy_v3_v3(tmp_co, co);
}
BLI_space_transform_apply(&calc->local2target, tmp_co);
/* Use local proximity heuristics (to reduce the nearest search)
*
* If we already had an hit before.. we assume this vertex is going to have a close hit to that
* other vertex so we can initiate the "nearest.dist" with the expected value to that last hit.
* This will lead in pruning of the search tree. */
if (nearest->index != -1) {
if (calc->smd->shrinkType == MOD_SHRINKWRAP_TARGET_PROJECT) {
/* Heuristic doesn't work because of additional restrictions. */
nearest->index = -1;
nearest->dist_sq = FLT_MAX;
}
else {
nearest->dist_sq = len_squared_v3v3(tmp_co, nearest->co);
}
}
else {
nearest->dist_sq = FLT_MAX;
}
BKE_shrinkwrap_find_nearest_surface(data->tree, nearest, tmp_co, calc->smd->shrinkType);
/* Found the nearest vertex */
if (nearest->index != -1) {
BKE_shrinkwrap_snap_point_to_surface(data->tree,
NULL,
calc->smd->shrinkMode,
nearest->index,
nearest->co,
nearest->no,
calc->keepDist,
tmp_co,
tmp_co);
/* Convert the coordinates back to mesh coordinates */
BLI_space_transform_invert(&calc->local2target, tmp_co);
interp_v3_v3v3(co, co, tmp_co, weight); /* linear interpolation */
}
}
/**
* Compute a smooth normal of the target (if applicable) at the hit location.
*
* \param tree: information about the mesh
* \param transform: transform from the hit coordinate space to the object space; may be null
* \param r_no: output in hit coordinate space; may be shared with inputs
*/
void BKE_shrinkwrap_compute_smooth_normal(const struct ShrinkwrapTreeData *tree,
const struct SpaceTransform *transform,
int looptri_idx,
const float hit_co[3],
const float hit_no[3],
float r_no[3])
{
const BVHTreeFromMesh *treeData = &tree->treeData;
const MLoopTri *tri = &treeData->looptri[looptri_idx];
/* Interpolate smooth normals if enabled. */
if ((tree->mesh->mpoly[tri->poly].flag & ME_SMOOTH) != 0) {
const MVert *verts[] = {
&treeData->vert[treeData->loop[tri->tri[0]].v],
&treeData->vert[treeData->loop[tri->tri[1]].v],
&treeData->vert[treeData->loop[tri->tri[2]].v],
};
float w[3], no[3][3], tmp_co[3];
/* Custom and auto smooth split normals. */
if (tree->clnors) {
copy_v3_v3(no[0], tree->clnors[tri->tri[0]]);
copy_v3_v3(no[1], tree->clnors[tri->tri[1]]);
copy_v3_v3(no[2], tree->clnors[tri->tri[2]]);
}
/* Ordinary vertex normals. */
else {
normal_short_to_float_v3(no[0], verts[0]->no);
normal_short_to_float_v3(no[1], verts[1]->no);
normal_short_to_float_v3(no[2], verts[2]->no);
}
/* Barycentric weights from hit point. */
copy_v3_v3(tmp_co, hit_co);
if (transform) {
BLI_space_transform_apply(transform, tmp_co);
}
interp_weights_tri_v3(w, verts[0]->co, verts[1]->co, verts[2]->co, tmp_co);
/* Interpolate using weights. */
interp_v3_v3v3v3(r_no, no[0], no[1], no[2], w);
if (transform) {
BLI_space_transform_invert_normal(transform, r_no);
}
else {
normalize_v3(r_no);
}
}
/* Use the polygon normal if flat. */
else if (tree->pnors != NULL) {
copy_v3_v3(r_no, tree->pnors[tri->poly]);
}
/* Finally fallback to the looptri normal. */
else {
copy_v3_v3(r_no, hit_no);
}
}
/* Helper for MOD_SHRINKWRAP_INSIDE, MOD_SHRINKWRAP_OUTSIDE and MOD_SHRINKWRAP_OUTSIDE_SURFACE. */
static void shrinkwrap_snap_with_side(float r_point_co[3],
const float point_co[3],
const float hit_co[3],
const float hit_no[3],
float goal_dist,
float forcesign,
bool forcesnap)
{
float delta[3];
sub_v3_v3v3(delta, point_co, hit_co);
float dist = len_v3(delta);
/* If exactly on the surface, push out along normal */
if (dist < FLT_EPSILON) {
if (forcesnap || goal_dist > 0) {
madd_v3_v3v3fl(r_point_co, hit_co, hit_no, goal_dist * forcesign);
}
else {
copy_v3_v3(r_point_co, hit_co);
}
}
/* Move to the correct side if needed */
else {
float dsign = signf(dot_v3v3(delta, hit_no));
if (forcesign == 0.0f) {
forcesign = dsign;
}
/* If on the wrong side or too close, move to correct */
if (forcesnap || dsign * dist * forcesign < goal_dist) {
mul_v3_fl(delta, dsign / dist);
/* At very small distance, blend in the hit normal to stabilize math. */
float dist_epsilon = (fabsf(goal_dist) + len_manhattan_v3(hit_co)) * 1e-4f;
if (dist < dist_epsilon) {
#ifdef TRACE_TARGET_PROJECT
printf("zero_factor %g = %g / %g\n", dist / dist_epsilon, dist, dist_epsilon);
#endif
interp_v3_v3v3(delta, hit_no, delta, dist / dist_epsilon);
}
madd_v3_v3v3fl(r_point_co, hit_co, delta, goal_dist * forcesign);
}
else {
copy_v3_v3(r_point_co, point_co);
}
}
}
/**
* Apply the shrink to surface modes to the given original coordinates and nearest point.
*
* \param tree: mesh data for smooth normals
* \param transform: transform from the hit coordinate space to the object space; may be null
* \param r_point_co: may be the same memory location as point_co, hit_co, or hit_no.
*/
void BKE_shrinkwrap_snap_point_to_surface(const struct ShrinkwrapTreeData *tree,
const struct SpaceTransform *transform,
int mode,
int hit_idx,
const float hit_co[3],
const float hit_no[3],
float goal_dist,
const float point_co[3],
float r_point_co[3])
{
float tmp[3];
switch (mode) {
/* Offsets along the line between point_co and hit_co. */
case MOD_SHRINKWRAP_ON_SURFACE:
if (goal_dist != 0) {
shrinkwrap_snap_with_side(r_point_co, point_co, hit_co, hit_no, goal_dist, 0, true);
}
else {
copy_v3_v3(r_point_co, hit_co);
}
break;
case MOD_SHRINKWRAP_INSIDE:
shrinkwrap_snap_with_side(r_point_co, point_co, hit_co, hit_no, goal_dist, -1, false);
break;
case MOD_SHRINKWRAP_OUTSIDE:
shrinkwrap_snap_with_side(r_point_co, point_co, hit_co, hit_no, goal_dist, +1, false);
break;
case MOD_SHRINKWRAP_OUTSIDE_SURFACE:
if (goal_dist != 0) {
shrinkwrap_snap_with_side(r_point_co, point_co, hit_co, hit_no, goal_dist, +1, true);
}
else {
copy_v3_v3(r_point_co, hit_co);
}
break;
/* Offsets along the normal */
case MOD_SHRINKWRAP_ABOVE_SURFACE:
if (goal_dist != 0) {
BKE_shrinkwrap_compute_smooth_normal(tree, transform, hit_idx, hit_co, hit_no, tmp);
madd_v3_v3v3fl(r_point_co, hit_co, tmp, goal_dist);
}
else {
copy_v3_v3(r_point_co, hit_co);
}
break;
default:
printf("Unknown Shrinkwrap surface snap mode: %d\n", mode);
copy_v3_v3(r_point_co, hit_co);
}
}
static void shrinkwrap_calc_nearest_surface_point(ShrinkwrapCalcData *calc)
{
BVHTreeNearest nearest = NULL_BVHTreeNearest;
/* Setup nearest */
nearest.index = -1;
nearest.dist_sq = FLT_MAX;
/* Find the nearest vertex */
ShrinkwrapCalcCBData data = {
.calc = calc,
.tree = calc->tree,
};
TaskParallelSettings settings;
BLI_parallel_range_settings_defaults(&settings);
settings.use_threading = (calc->numVerts > BKE_MESH_OMP_LIMIT);
settings.userdata_chunk = &nearest;
settings.userdata_chunk_size = sizeof(nearest);
BLI_task_parallel_range(
0, calc->numVerts, &data, shrinkwrap_calc_nearest_surface_point_cb_ex, &settings);
}
/* Main shrinkwrap function */
void shrinkwrapModifier_deform(ShrinkwrapModifierData *smd,
const ModifierEvalContext *ctx,
struct Scene *scene,
Object *ob,
Mesh *mesh,
MDeformVert *dvert,
const int defgrp_index,
float (*vertexCos)[3],
int numVerts)
{
DerivedMesh *ss_mesh = NULL;
ShrinkwrapCalcData calc = NULL_ShrinkwrapCalcData;
/* remove loop dependencies on derived meshes (TODO should this be done elsewhere?) */
if (smd->target == ob) {
smd->target = NULL;
}
if (smd->auxTarget == ob) {
smd->auxTarget = NULL;
}
/* Configure Shrinkwrap calc data */
calc.smd = smd;
calc.ob = ob;
calc.numVerts = numVerts;
calc.vertexCos = vertexCos;
calc.dvert = dvert;
calc.vgroup = defgrp_index;
calc.invert_vgroup = (smd->shrinkOpts & MOD_SHRINKWRAP_INVERT_VGROUP) != 0;
if (smd->target != NULL) {
Object *ob_target = DEG_get_evaluated_object(ctx->depsgraph, smd->target);
calc.target = BKE_modifier_get_evaluated_mesh_from_evaluated_object(ob_target, false);
/* TODO: there might be several "bugs" with non-uniform scales matrices
* because it will no longer be nearest surface, not sphere projection
* because space has been deformed */
BLI_SPACE_TRANSFORM_SETUP(&calc.local2target, ob, ob_target);
/* TODO: smd->keepDist is in global units.. must change to local */
calc.keepDist = smd->keepDist;
}
calc.aux_target = DEG_get_evaluated_object(ctx->depsgraph, smd->auxTarget);
if (mesh != NULL && smd->shrinkType == MOD_SHRINKWRAP_PROJECT) {
/* Setup arrays to get vertexs positions, normals and deform weights */
calc.vert = mesh->mvert;
/* Using vertexs positions/normals as if a subsurface was applied */
if (smd->subsurfLevels) {
SubsurfModifierData ssmd = {{NULL}};
ssmd.subdivType = ME_CC_SUBSURF; /* catmull clark */
ssmd.levels = smd->subsurfLevels; /* levels */
/* TODO: to be moved to Mesh once we are done with changes in subsurf code. */
DerivedMesh *dm = CDDM_from_mesh(mesh);
ss_mesh = subsurf_make_derived_from_derived(
dm, &ssmd, scene, NULL, (ob->mode & OB_MODE_EDIT) ? SUBSURF_IN_EDIT_MODE : 0);
if (ss_mesh) {
calc.vert = ss_mesh->getVertDataArray(ss_mesh, CD_MVERT);
if (calc.vert) {
/* TRICKY: this code assumes subsurface will have the transformed original vertices
* in their original order at the end of the vert array. */
calc.vert = calc.vert + ss_mesh->getNumVerts(ss_mesh) - dm->getNumVerts(dm);
}
}
/* Just to make sure we are not leaving any memory behind */
BLI_assert(ssmd.emCache == NULL);
BLI_assert(ssmd.mCache == NULL);
dm->release(dm);
}
}
/* Projecting target defined - lets work! */
ShrinkwrapTreeData tree;
if (BKE_shrinkwrap_init_tree(&tree, calc.target, smd->shrinkType, smd->shrinkMode, false)) {
calc.tree = &tree;
switch (smd->shrinkType) {
case MOD_SHRINKWRAP_NEAREST_SURFACE:
case MOD_SHRINKWRAP_TARGET_PROJECT:
TIMEIT_BENCH(shrinkwrap_calc_nearest_surface_point(&calc), deform_surface);
break;
case MOD_SHRINKWRAP_PROJECT:
TIMEIT_BENCH(shrinkwrap_calc_normal_projection(&calc), deform_project);
break;
case MOD_SHRINKWRAP_NEAREST_VERTEX:
TIMEIT_BENCH(shrinkwrap_calc_nearest_vertex(&calc), deform_vertex);
break;
}
BKE_shrinkwrap_free_tree(&tree);
}
/* free memory */
if (ss_mesh) {
ss_mesh->release(ss_mesh);
}
}
void BKE_shrinkwrap_mesh_nearest_surface_deform(struct bContext *C,
Object *ob_source,
Object *ob_target)
{
Depsgraph *depsgraph = CTX_data_depsgraph_pointer(C);
struct Scene *sce = CTX_data_scene(C);
ShrinkwrapModifierData ssmd = {{0}};
ModifierEvalContext ctx = {depsgraph, ob_source, 0};
int totvert;
ssmd.target = ob_target;
ssmd.shrinkType = MOD_SHRINKWRAP_NEAREST_SURFACE;
ssmd.shrinkMode = MOD_SHRINKWRAP_ON_SURFACE;
ssmd.keepDist = 0.0f;
Mesh *src_me = ob_source->data;
float(*vertexCos)[3] = BKE_mesh_vert_coords_alloc(src_me, &totvert);
shrinkwrapModifier_deform(&ssmd, &ctx, sce, ob_source, src_me, NULL, -1, vertexCos, totvert);
BKE_mesh_vert_coords_apply(src_me, vertexCos);
MEM_freeN(vertexCos);
}
void BKE_shrinkwrap_remesh_target_project(Mesh *src_me, Mesh *target_me, Object *ob_target)
{
ShrinkwrapModifierData ssmd = {{0}};
int totvert;
ssmd.target = ob_target;
ssmd.shrinkType = MOD_SHRINKWRAP_PROJECT;
ssmd.shrinkMode = MOD_SHRINKWRAP_ON_SURFACE;
ssmd.shrinkOpts = MOD_SHRINKWRAP_PROJECT_ALLOW_NEG_DIR | MOD_SHRINKWRAP_PROJECT_ALLOW_POS_DIR;
ssmd.keepDist = 0.0f;
/* Tolerance value to prevent artifacts on sharp edges of a mesh.
* This constant and based on experimenting with different values. */
const float projLimitTolerance = 5.0f;
ssmd.projLimit = target_me->remesh_voxel_size * projLimitTolerance;
float(*vertexCos)[3] = BKE_mesh_vert_coords_alloc(src_me, &totvert);
ShrinkwrapCalcData calc = NULL_ShrinkwrapCalcData;
calc.smd = &ssmd;
calc.numVerts = src_me->totvert;
calc.vertexCos = vertexCos;
calc.vgroup = -1;
calc.target = target_me;
calc.keepDist = ssmd.keepDist;
calc.vert = src_me->mvert;
BLI_SPACE_TRANSFORM_SETUP(&calc.local2target, ob_target, ob_target);
ShrinkwrapTreeData tree;
if (BKE_shrinkwrap_init_tree(&tree, calc.target, ssmd.shrinkType, ssmd.shrinkMode, false)) {
calc.tree = &tree;
TIMEIT_BENCH(shrinkwrap_calc_normal_projection(&calc), deform_project);
BKE_shrinkwrap_free_tree(&tree);
}
BKE_mesh_vert_coords_apply(src_me, vertexCos);
MEM_freeN(vertexCos);
}
Reference in New Issue View Git Blame Copy Permalink