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|
/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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.
*
* The Original Code is: all of this file.
*
* Contributor(s): Andr Pinto.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/blenkernel/intern/bvhutils.c
* \ingroup bke
*/
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include "DNA_meshdata_types.h"
#include "BLI_utildefines.h"
#include "BLI_linklist.h"
#include "BLI_math.h"
#include "BLI_threads.h"
#include "BKE_DerivedMesh.h"
#include "BKE_editmesh.h"
#include "MEM_guardedalloc.h"
static ThreadRWMutex cache_rwlock = BLI_RWLOCK_INITIALIZER;
/* Math stuff for ray casting on mesh faces and for nearest surface */
float bvhtree_ray_tri_intersection(const BVHTreeRay *ray, const float UNUSED(m_dist), const float v0[3], const float v1[3], const float v2[3])
{
float dist;
if (isect_ray_tri_epsilon_v3(ray->origin, ray->direction, v0, v1, v2, &dist, NULL, FLT_EPSILON))
return dist;
return FLT_MAX;
}
static float sphereray_tri_intersection(const BVHTreeRay *ray, float radius, const float m_dist, const float v0[3], const float v1[3], const float v2[3])
{
float idist;
float p1[3];
float hit_point[3];
madd_v3_v3v3fl(p1, ray->origin, ray->direction, m_dist);
if (isect_sweeping_sphere_tri_v3(ray->origin, p1, radius, v0, v1, v2, &idist, hit_point)) {
return idist * m_dist;
}
return FLT_MAX;
}
/*
* BVH from meshes callbacks
*/
/* Callback to bvh tree nearest point. The tree must bust have been built using bvhtree_from_mesh_faces.
* userdata must be a BVHMeshCallbackUserdata built from the same mesh as the tree. */
static void mesh_faces_nearest_point(void *userdata, int index, const float co[3], BVHTreeNearest *nearest)
{
const BVHTreeFromMesh *data = (BVHTreeFromMesh *) userdata;
MVert *vert = data->vert;
MFace *face = data->face + index;
const float *t0, *t1, *t2, *t3;
t0 = vert[face->v1].co;
t1 = vert[face->v2].co;
t2 = vert[face->v3].co;
t3 = face->v4 ? vert[face->v4].co : NULL;
do {
float nearest_tmp[3], dist_sq;
closest_on_tri_to_point_v3(nearest_tmp, co, t0, t1, t2);
dist_sq = len_squared_v3v3(co, nearest_tmp);
if (dist_sq < nearest->dist_sq) {
nearest->index = index;
nearest->dist_sq = dist_sq;
copy_v3_v3(nearest->co, nearest_tmp);
normal_tri_v3(nearest->no, t0, t1, t2);
if (t1 == vert[face->v3].co)
nearest->flags |= BVH_ONQUAD;
}
t1 = t2;
t2 = t3;
t3 = NULL;
} while (t2);
}
/* copy of function above (warning, should de-duplicate with editmesh_bvh.c) */
static void editmesh_faces_nearest_point(void *userdata, int index, const float co[3], BVHTreeNearest *nearest)
{
const BVHTreeFromMesh *data = (BVHTreeFromMesh *) userdata;
BMEditMesh *em = data->em_evil;
const BMLoop **ltri = (const BMLoop **)em->looptris[index];
const float *t0, *t1, *t2;
t0 = ltri[0]->v->co;
t1 = ltri[1]->v->co;
t2 = ltri[2]->v->co;
{
float nearest_tmp[3], dist_sq;
closest_on_tri_to_point_v3(nearest_tmp, co, t0, t1, t2);
dist_sq = len_squared_v3v3(co, nearest_tmp);
if (dist_sq < nearest->dist_sq) {
nearest->index = index;
nearest->dist_sq = dist_sq;
copy_v3_v3(nearest->co, nearest_tmp);
normal_tri_v3(nearest->no, t0, t1, t2);
}
}
}
/* Callback to bvh tree raycast. The tree must bust have been built using bvhtree_from_mesh_faces.
* userdata must be a BVHMeshCallbackUserdata built from the same mesh as the tree. */
static void mesh_faces_spherecast(void *userdata, int index, const BVHTreeRay *ray, BVHTreeRayHit *hit)
{
const BVHTreeFromMesh *data = (BVHTreeFromMesh *) userdata;
MVert *vert = data->vert;
MFace *face = data->face + index;
const float *t0, *t1, *t2, *t3;
t0 = vert[face->v1].co;
t1 = vert[face->v2].co;
t2 = vert[face->v3].co;
t3 = face->v4 ? vert[face->v4].co : NULL;
do {
float dist;
if (data->sphere_radius == 0.0f)
dist = bvhtree_ray_tri_intersection(ray, hit->dist, t0, t1, t2);
else
dist = sphereray_tri_intersection(ray, data->sphere_radius, hit->dist, t0, t1, t2);
if (dist >= 0 && dist < hit->dist) {
hit->index = index;
hit->dist = dist;
madd_v3_v3v3fl(hit->co, ray->origin, ray->direction, dist);
normal_tri_v3(hit->no, t0, t1, t2);
if (t1 == vert[face->v3].co)
hit->flags |= BVH_ONQUAD;
}
t1 = t2;
t2 = t3;
t3 = NULL;
} while (t2);
}
/* copy of function above (warning, should de-duplicate with editmesh_bvh.c) */
static void editmesh_faces_spherecast(void *userdata, int index, const BVHTreeRay *ray, BVHTreeRayHit *hit)
{
const BVHTreeFromMesh *data = (BVHTreeFromMesh *) userdata;
BMEditMesh *em = data->em_evil;
const BMLoop **ltri = (const BMLoop **)em->looptris[index];
const float *t0, *t1, *t2;
t0 = ltri[0]->v->co;
t1 = ltri[1]->v->co;
t2 = ltri[2]->v->co;
{
float dist;
if (data->sphere_radius == 0.0f)
dist = bvhtree_ray_tri_intersection(ray, hit->dist, t0, t1, t2);
else
dist = sphereray_tri_intersection(ray, data->sphere_radius, hit->dist, t0, t1, t2);
if (dist >= 0 && dist < hit->dist) {
hit->index = index;
hit->dist = dist;
madd_v3_v3v3fl(hit->co, ray->origin, ray->direction, dist);
normal_tri_v3(hit->no, t0, t1, t2);
}
}
}
/* Callback to bvh tree nearest point. The tree must bust have been built using bvhtree_from_mesh_edges.
* userdata must be a BVHMeshCallbackUserdata built from the same mesh as the tree. */
static void mesh_edges_nearest_point(void *userdata, int index, const float co[3], BVHTreeNearest *nearest)
{
const BVHTreeFromMesh *data = (BVHTreeFromMesh *) userdata;
MVert *vert = data->vert;
MEdge *edge = data->edge + index;
float nearest_tmp[3], dist_sq;
const float *t0, *t1;
t0 = vert[edge->v1].co;
t1 = vert[edge->v2].co;
closest_to_line_segment_v3(nearest_tmp, co, t0, t1);
dist_sq = len_squared_v3v3(nearest_tmp, co);
if (dist_sq < nearest->dist_sq) {
nearest->index = index;
nearest->dist_sq = dist_sq;
copy_v3_v3(nearest->co, nearest_tmp);
sub_v3_v3v3(nearest->no, t0, t1);
normalize_v3(nearest->no);
}
}
/*
* BVH builders
*/
/* Builds a bvh tree.. where nodes are the vertexs of the given mesh */
BVHTree *bvhtree_from_mesh_verts(BVHTreeFromMesh *data, DerivedMesh *dm, float epsilon, int tree_type, int axis)
{
BVHTree *tree;
MVert *vert;
bool vert_allocated;
BLI_rw_mutex_lock(&cache_rwlock, THREAD_LOCK_READ);
tree = bvhcache_find(&dm->bvhCache, BVHTREE_FROM_VERTICES);
BLI_rw_mutex_unlock(&cache_rwlock);
vert = DM_get_vert_array(dm, &vert_allocated);
/* Not in cache */
if (tree == NULL) {
BLI_rw_mutex_lock(&cache_rwlock, THREAD_LOCK_WRITE);
tree = bvhcache_find(&dm->bvhCache, BVHTREE_FROM_VERTICES);
if (tree == NULL) {
int i;
int numVerts = dm->getNumVerts(dm);
if (vert != NULL) {
tree = BLI_bvhtree_new(numVerts, epsilon, tree_type, axis);
if (tree != NULL) {
for (i = 0; i < numVerts; i++) {
BLI_bvhtree_insert(tree, i, vert[i].co, 1);
}
BLI_bvhtree_balance(tree);
/* Save on cache for later use */
// printf("BVHTree built and saved on cache\n");
bvhcache_insert(&dm->bvhCache, tree, BVHTREE_FROM_VERTICES);
}
}
}
BLI_rw_mutex_unlock(&cache_rwlock);
}
else {
// printf("BVHTree is already build, using cached tree\n");
}
/* Setup BVHTreeFromMesh */
memset(data, 0, sizeof(*data));
data->tree = tree;
if (data->tree) {
data->cached = true;
/* a NULL nearest callback works fine
* remember the min distance to point is the same as the min distance to BV of point */
data->nearest_callback = NULL;
data->raycast_callback = NULL;
data->vert = vert;
data->vert_allocated = vert_allocated;
data->face = DM_get_tessface_array(dm, &data->face_allocated);
data->sphere_radius = epsilon;
}
else {
if (vert_allocated) {
MEM_freeN(vert);
}
}
return data->tree;
}
/* Builds a bvh tree.. where nodes are the faces of the given dm. */
BVHTree *bvhtree_from_mesh_faces(BVHTreeFromMesh *data, DerivedMesh *dm, float epsilon, int tree_type, int axis)
{
BMEditMesh *em = data->em_evil;
const int bvhcache_type = em ? BVHTREE_FROM_FACES_EDITMESH : BVHTREE_FROM_FACES;
BVHTree *tree;
MVert *vert;
MFace *face;
bool vert_allocated = false, face_allocated = false;
BLI_rw_mutex_lock(&cache_rwlock, THREAD_LOCK_READ);
tree = bvhcache_find(&dm->bvhCache, bvhcache_type);
BLI_rw_mutex_unlock(&cache_rwlock);
if (em == NULL) {
vert = DM_get_vert_array(dm, &vert_allocated);
face = DM_get_tessface_array(dm, &face_allocated);
}
/* Not in cache */
if (tree == NULL) {
BLI_rw_mutex_lock(&cache_rwlock, THREAD_LOCK_WRITE);
tree = bvhcache_find(&dm->bvhCache, bvhcache_type);
if (tree == NULL) {
int i;
int numFaces;
/* BMESH specific check that we have tessfaces,
* we _could_ tessellate here but rather not - campbell
*
* this assert checks we have tessfaces,
* if not caller should use DM_ensure_tessface() */
if (em) {
numFaces = em->tottri;
}
else {
numFaces = dm->getNumTessFaces(dm);
BLI_assert(!(numFaces == 0 && dm->getNumPolys(dm) != 0));
}
if (numFaces != 0) {
/* Create a bvh-tree of the given target */
// printf("%s: building BVH, total=%d\n", __func__, numFaces);
tree = BLI_bvhtree_new(numFaces, epsilon, tree_type, axis);
if (tree != NULL) {
if (em) {
const struct BMLoop *(*looptris)[3] = (void *)em->looptris;
/* avoid double-up on face searches for quads-ngons */
bool insert_prev = false;
BMFace *f_prev = NULL;
/* data->em_evil is only set for snapping, and only for the mesh of the object
* which is currently open in edit mode. When set, the bvhtree should not contain
* faces that will interfere with snapping (e.g. faces that are hidden/selected
* or faces that have selected verts).*/
/* Insert BMesh-tessellation triangles into the bvh tree, unless they are hidden
* and/or selected. Even if the faces themselves are not selected for the snapped
* transform, having a vertex selected means the face (and thus it's tessellated
* triangles) will be moving and will not be a good snap targets.*/
for (i = 0; i < em->tottri; i++) {
const BMLoop **ltri = looptris[i];
BMFace *f = ltri[0]->f;
bool insert;
/* Start with the assumption the triangle should be included for snapping. */
if (f == f_prev) {
insert = insert_prev;
}
else {
if (BM_elem_flag_test(f, BM_ELEM_SELECT) || BM_elem_flag_test(f, BM_ELEM_HIDDEN)) {
/* Don't insert triangles tessellated from faces that are hidden
* or selected*/
insert = false;
}
else {
BMLoop *l_iter, *l_first;
insert = true;
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
if (BM_elem_flag_test(l_iter->v, BM_ELEM_SELECT)) {
/* Don't insert triangles tessellated from faces that have
* any selected verts.*/
insert = false;
break;
}
} while ((l_iter = l_iter->next) != l_first);
}
/* skip if face doesn't change */
f_prev = f;
insert_prev = insert;
}
if (insert) {
/* No reason found to block hit-testing the triangle for snap,
* so insert it now.*/
float co[3][3];
copy_v3_v3(co[0], ltri[0]->v->co);
copy_v3_v3(co[1], ltri[1]->v->co);
copy_v3_v3(co[2], ltri[2]->v->co);
BLI_bvhtree_insert(tree, i, co[0], 3);
}
}
}
else {
if (vert != NULL && face != NULL) {
for (i = 0; i < numFaces; i++) {
float co[4][3];
copy_v3_v3(co[0], vert[face[i].v1].co);
copy_v3_v3(co[1], vert[face[i].v2].co);
copy_v3_v3(co[2], vert[face[i].v3].co);
if (face[i].v4)
copy_v3_v3(co[3], vert[face[i].v4].co);
BLI_bvhtree_insert(tree, i, co[0], face[i].v4 ? 4 : 3);
}
}
}
BLI_bvhtree_balance(tree);
/* Save on cache for later use */
// printf("BVHTree built and saved on cache\n");
bvhcache_insert(&dm->bvhCache, tree, bvhcache_type);
}
}
}
BLI_rw_mutex_unlock(&cache_rwlock);
}
else {
// printf("BVHTree is already build, using cached tree\n");
}
/* Setup BVHTreeFromMesh */
memset(data, 0, sizeof(*data));
data->tree = tree;
data->em_evil = em;
if (data->tree) {
data->cached = true;
if (em) {
data->nearest_callback = editmesh_faces_nearest_point;
data->raycast_callback = editmesh_faces_spherecast;
}
else {
data->nearest_callback = mesh_faces_nearest_point;
data->raycast_callback = mesh_faces_spherecast;
data->vert = vert;
data->vert_allocated = vert_allocated;
data->face = face;
data->face_allocated = face_allocated;
}
data->sphere_radius = epsilon;
}
else {
if (vert_allocated) {
MEM_freeN(vert);
}
if (face_allocated) {
MEM_freeN(face);
}
}
return data->tree;
}
/* Builds a bvh tree.. where nodes are the faces of the given dm. */
BVHTree *bvhtree_from_mesh_edges(BVHTreeFromMesh *data, DerivedMesh *dm, float epsilon, int tree_type, int axis)
{
BVHTree *tree;
MVert *vert;
MEdge *edge;
bool vert_allocated, edge_allocated;
BLI_rw_mutex_lock(&cache_rwlock, THREAD_LOCK_READ);
tree = bvhcache_find(&dm->bvhCache, BVHTREE_FROM_EDGES);
BLI_rw_mutex_unlock(&cache_rwlock);
vert = DM_get_vert_array(dm, &vert_allocated);
edge = DM_get_edge_array(dm, &edge_allocated);
/* Not in cache */
if (tree == NULL) {
BLI_rw_mutex_lock(&cache_rwlock, THREAD_LOCK_WRITE);
tree = bvhcache_find(&dm->bvhCache, BVHTREE_FROM_EDGES);
if (tree == NULL) {
int i;
int numEdges = dm->getNumEdges(dm);
if (vert != NULL && edge != NULL) {
/* Create a bvh-tree of the given target */
tree = BLI_bvhtree_new(numEdges, epsilon, tree_type, axis);
if (tree != NULL) {
for (i = 0; i < numEdges; i++) {
float co[4][3];
copy_v3_v3(co[0], vert[edge[i].v1].co);
copy_v3_v3(co[1], vert[edge[i].v2].co);
BLI_bvhtree_insert(tree, i, co[0], 2);
}
BLI_bvhtree_balance(tree);
/* Save on cache for later use */
// printf("BVHTree built and saved on cache\n");
bvhcache_insert(&dm->bvhCache, tree, BVHTREE_FROM_EDGES);
}
}
}
BLI_rw_mutex_unlock(&cache_rwlock);
}
else {
// printf("BVHTree is already build, using cached tree\n");
}
/* Setup BVHTreeFromMesh */
memset(data, 0, sizeof(*data));
data->tree = tree;
if (data->tree) {
data->cached = true;
data->nearest_callback = mesh_edges_nearest_point;
data->raycast_callback = NULL;
data->vert = vert;
data->vert_allocated = vert_allocated;
data->edge = edge;
data->edge_allocated = edge_allocated;
data->sphere_radius = epsilon;
}
else {
if (vert_allocated) {
MEM_freeN(vert);
}
if (edge_allocated) {
MEM_freeN(edge);
}
}
return data->tree;
}
/* Frees data allocated by a call to bvhtree_from_mesh_*. */
void free_bvhtree_from_mesh(struct BVHTreeFromMesh *data)
{
if (data->tree) {
if (!data->cached)
BLI_bvhtree_free(data->tree);
if (data->vert_allocated) {
MEM_freeN(data->vert);
}
if (data->edge_allocated) {
MEM_freeN(data->edge);
}
if (data->face_allocated) {
MEM_freeN(data->face);
}
memset(data, 0, sizeof(*data));
}
}
/* BVHCache */
typedef struct BVHCacheItem {
int type;
BVHTree *tree;
} BVHCacheItem;
static void bvhcacheitem_set_if_match(void *_cached, void *_search)
{
BVHCacheItem *cached = (BVHCacheItem *)_cached;
BVHCacheItem *search = (BVHCacheItem *)_search;
if (search->type == cached->type) {
search->tree = cached->tree;
}
}
BVHTree *bvhcache_find(BVHCache *cache, int type)
{
BVHCacheItem item;
item.type = type;
item.tree = NULL;
BLI_linklist_apply(*cache, bvhcacheitem_set_if_match, &item);
return item.tree;
}
void bvhcache_insert(BVHCache *cache, BVHTree *tree, int type)
{
BVHCacheItem *item = NULL;
assert(tree != NULL);
assert(bvhcache_find(cache, type) == NULL);
item = MEM_mallocN(sizeof(BVHCacheItem), "BVHCacheItem");
assert(item != NULL);
item->type = type;
item->tree = tree;
BLI_linklist_prepend(cache, item);
}
void bvhcache_init(BVHCache *cache)
{
*cache = NULL;
}
static void bvhcacheitem_free(void *_item)
{
BVHCacheItem *item = (BVHCacheItem *)_item;
BLI_bvhtree_free(item->tree);
MEM_freeN(item);
}
void bvhcache_free(BVHCache *cache)
{
BLI_linklist_free(*cache, (LinkNodeFreeFP)bvhcacheitem_free);
*cache = NULL;
}
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