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BMesh: option to filter out faces during raycast 

This allows us to more easily cast from the surface of a mesh
without normal offsets (Which can give precision issues).
This commit is contained in:
Campbell Barton 2015-01-13 23:54:14 +11:00
parent bd00770715
commit a2a7260915
2 changed files with 93 additions and 21 deletions
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14
source/blender/blenkernel/BKE_editmesh_bvh.h
View File

@ -43,6 +43,8 @@ struct Scene;
typedef struct BMBVHTree BMBVHTree;
typedef bool (*BMBVHTree_FaceFilter)(struct BMFace *f, void *userdata);
BMBVHTree *BKE_bmbvh_new_from_editmesh(
struct BMEditMesh *em, int flag,
const float (*cos_cage)[3], const bool cos_cage_free);
@ -55,8 +57,16 @@ BMBVHTree *BKE_bmbvh_new(
const float (*cos_cage)[3], const bool cos_cage_free);
void BKE_bmbvh_free(BMBVHTree *tree);
struct BVHTree *BKE_bmbvh_tree_get(BMBVHTree *tree);
struct BMFace *BKE_bmbvh_ray_cast(BMBVHTree *tree, const float co[3], const float dir[3], const float radius,
float *r_dist, float r_hitout[3], float r_cagehit[3]);
struct BMFace *BKE_bmbvh_ray_cast(
BMBVHTree *tree, const float co[3], const float dir[3], const float radius,
float *r_dist, float r_hitout[3], float r_cagehit[3]);
struct BMFace *BKE_bmbvh_ray_cast_filter(
BMBVHTree *tree, const float co[3], const float dir[3], const float radius,
float *r_dist, float r_hitout[3], float r_cagehit[3],
BMBVHTree_FaceFilter filter, void *filter_cb);
/* find a face intersecting a segment (but not apart of the segment) */
struct BMFace *BKE_bmbvh_find_face_segment(BMBVHTree *tree, const float co_a[3], const float co_b[3],
float *r_fac, float r_hitout[3], float r_cagehit[3]);

100
source/blender/blenkernel/intern/editmesh_bvh.c
View File

@ -239,6 +239,32 @@ struct RayCastUserData {
float uv[2];
};
static BMFace *bmbvh_ray_cast_handle_hit(
BMBVHTree *bmtree, struct RayCastUserData *bmcb_data, const BVHTreeRayHit *hit,
float *r_dist, float r_hitout[3], float r_cagehit[3])
{
if (r_hitout) {
if (bmtree->flag & BMBVH_RETURN_ORIG) {
BMLoop **ltri = bmtree->looptris[hit->index];
interp_v3_v3v3v3_uv(r_hitout, ltri[0]->v->co, ltri[1]->v->co, ltri[2]->v->co, bmcb_data->uv);
}
else {
copy_v3_v3(r_hitout, hit->co);
}
if (r_cagehit) {
copy_v3_v3(r_cagehit, hit->co);
}
}
if (r_dist) {
*r_dist = hit->dist;
}
return bmtree->looptris[hit->index][0]->f;
}
static void bmbvh_ray_cast_cb(void *userdata, int index, const BVHTreeRay *ray, BVHTreeRayHit *hit)
{
struct RayCastUserData *bmcb_data = userdata;
@ -284,31 +310,67 @@ BMFace *BKE_bmbvh_ray_cast(BMBVHTree *bmtree, const float co[3], const float dir
bmcb_data.cos_cage = (const float (*)[3])bmtree->cos_cage;
BLI_bvhtree_ray_cast(bmtree->tree, co, dir, radius, &hit, bmbvh_ray_cast_cb, &bmcb_data);
if (hit.index != -1 && hit.dist != dist) {
if (r_hitout) {
if (bmtree->flag & BMBVH_RETURN_ORIG) {
BMLoop **ltri = bmtree->looptris[hit.index];
interp_v3_v3v3v3_uv(r_hitout, ltri[0]->v->co, ltri[1]->v->co, ltri[2]->v->co, bmcb_data.uv);
}
else {
copy_v3_v3(r_hitout, hit.co);
}
if (r_cagehit) {
copy_v3_v3(r_cagehit, hit.co);
}
}
if (r_dist) {
*r_dist = hit.dist;
}
return bmtree->looptris[hit.index][0]->f;
return bmbvh_ray_cast_handle_hit(bmtree, &bmcb_data, &hit, r_dist, r_hitout, r_cagehit);
}
return NULL;
}
/* -------------------------------------------------------------------- */
/* bmbvh_ray_cast_cb_filter */
/* Same as BKE_bmbvh_ray_cast but takes a callback to filter out faces.
*/
struct RayCastUserData_Filter {
struct RayCastUserData bmcb_data;
BMBVHTree_FaceFilter filter_cb;
void *filter_userdata;
};
static void bmbvh_ray_cast_cb_filter(void *userdata, int index, const BVHTreeRay *ray, BVHTreeRayHit *hit)
{
struct RayCastUserData_Filter *bmcb_data_filter = userdata;
struct RayCastUserData *bmcb_data = &bmcb_data_filter->bmcb_data;
const BMLoop **ltri = bmcb_data->looptris[index];
if (bmcb_data_filter->filter_cb(ltri[0]->f, bmcb_data_filter->filter_userdata)) {
bmbvh_ray_cast_cb(bmcb_data, index, ray, hit);
}
}
BMFace *BKE_bmbvh_ray_cast_filter(
BMBVHTree *bmtree, const float co[3], const float dir[3], const float radius,
float *r_dist, float r_hitout[3], float r_cagehit[3],
BMBVHTree_FaceFilter filter_cb, void *filter_userdata)
{
BVHTreeRayHit hit;
struct RayCastUserData_Filter bmcb_data_filter;
struct RayCastUserData *bmcb_data = &bmcb_data_filter.bmcb_data;
const float dist = r_dist ? *r_dist : FLT_MAX;
bmcb_data_filter.filter_cb = filter_cb;
bmcb_data_filter.filter_userdata = filter_userdata;
if (bmtree->cos_cage) BLI_assert(!(bmtree->bm->elem_index_dirty & BM_VERT));
hit.dist = dist;
hit.index = -1;
/* ok to leave 'uv' uninitialized */
bmcb_data->looptris = (const BMLoop *(*)[3])bmtree->looptris;
bmcb_data->cos_cage = (const float (*)[3])bmtree->cos_cage;
BLI_bvhtree_ray_cast(bmtree->tree, co, dir, radius, &hit, bmbvh_ray_cast_cb_filter, &bmcb_data_filter);
if (hit.index != -1 && hit.dist != dist) {
return bmbvh_ray_cast_handle_hit(bmtree, bmcb_data, &hit, r_dist, r_hitout, r_cagehit);
}
return NULL;
}
/* -------------------------------------------------------------------- */
/* BKE_bmbvh_find_face_segment */