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Snap System: BVH: ignore AABBs behind ray

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This provides a slight improvement in performance in specific cases, such as when the observer is inside a high poly object and executes snap to edge or vertex
This commit is contained in:
Germano Cavalcante
2017-01-30 02:49:41 -03:00
parent 318ee2e8c1
commit 505ff16dbf
1 changed files with 14 additions and 5 deletions
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15
source/blender/editors/transform/transform_snap_object.c
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@@ -542,13 +542,17 @@ static bool cb_walk_parent_snap_project(const BVHTreeAxisRange *bounds, void *us
/* if rtmin < rtmax, ray intersect `AABB` */
if (rtmin <= rtmax) {
#define IGNORE_BEHIND_RAY
#ifdef IGNORE_BEHIND_RAY
/* `if rtmax < depth_min`, the hit is behind us */
if (rtmax < data->depth_range[0]) {
/* TODO: TODO: Check if the entire AABB is behind ray
* this will prevent unnecessary leaf testing */
/* Test if the entire AABB is behind us */
float dvec[3];
sub_v3_v3v3(dvec, local_bvmax, data->ray_origin_local);
if (dot_v3v3(dvec, data->ray_direction_local) < (data->depth_range[0])) {
return false;
}
}
#endif
const float proj = rtmin * data->ray_direction_local[main_axis];
data->r_axis_closest[main_axis] = (proj - va[main_axis]) < (vb[main_axis] - proj);
@@ -557,10 +561,15 @@ static bool cb_walk_parent_snap_project(const BVHTreeAxisRange *bounds, void *us
#ifdef IGNORE_BEHIND_RAY
/* `if rtmin < depth_min`, the hit is behing us */
else if (rtmin < data->depth_range[0]) {
/* TODO: Test if the AABB is totally behind ray */
/* Test if the entire AABB is behind us */
float dvec[3];
sub_v3_v3v3(dvec, local_bvmax, data->ray_origin_local);
if (dot_v3v3(dvec, data->ray_direction_local) < (data->depth_range[0])) {
return false;
}
}
#endif
#undef IGNORE_BEHIND_RAY
if (data->sign[main_axis]) {
va[main_axis] = local_bvmax[main_axis];
vb[main_axis] = local_bvmin[main_axis];