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Using diagonal of AABB box to convert rays to segments

This commit is contained in:
iyaz 2013-04-16 20:58:40 +03:00
parent 65fc0a0b6b
commit c3b842dc46
2 changed files with 56 additions and 23 deletions
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74
Surface_mesh_segmentation/include/CGAL/internal/Surface_mesh_segmentation/SDF_calculation.h
View File

@ -96,29 +96,43 @@ private:
Tree tree;
double max_diagonal;
bool use_diagonal;
public:
/**
* Construct AABB tree with a mesh.
* @param mesh `CGAL Polyhedron` on which AABB tree constructed
* @param build_kd_tree requirement on internal kd-tree (it is only required if find_closest_with_AABB_distance is planned to use)
* @param use_diagonal if true: calculates diagonal of AABB tree and cast segments instead of rays using diagonal length
* @param traits trait object
*/
SDF_calculation(const Polyhedron& mesh, bool build_kd_tree = false,
GeomTraits traits = GeomTraits())
: traits(traits),
angle_functor(traits.angle_3_object()),
scale_functor(traits.construct_scaled_vector_3_object()),
sum_functor(traits.construct_sum_of_vectors_3_object()),
normal_functor(traits.construct_normal_3_object()),
unit_normal_functor(traits.construct_unit_normal_3_object()),
translated_point_functor(traits.construct_translated_point_3_object()),
centroid_functor(traits.construct_centroid_3_object()) {
bool use_diagonal = true, GeomTraits traits = GeomTraits())
:
use_diagonal(use_diagonal),
traits(traits),
angle_functor(traits.angle_3_object()),
scale_functor(traits.construct_scaled_vector_3_object()),
sum_functor(traits.construct_sum_of_vectors_3_object()),
normal_functor(traits.construct_normal_3_object()),
unit_normal_functor(traits.construct_unit_normal_3_object()),
translated_point_functor(traits.construct_translated_point_3_object()),
centroid_functor(traits.construct_centroid_3_object()) {
tree.insert(mesh.facets_begin(), mesh.facets_end());
tree.build();
if(build_kd_tree) {
tree.accelerate_distance_queries();
}
if(use_diagonal) {
CGAL::Bbox_3 bbox = tree.bbox();
max_diagonal =
std::sqrt(
CGAL::squared_distanceC3( bbox.xmin(), bbox.ymin(), bbox.zmin(), bbox.xmax(),
bbox.ymax(), bbox.zmax() )
);
}
}
/**
@ -259,8 +273,8 @@ public:
Plane plane(center, normal);
Vector v1 = plane.base1(), v2 = plane.base2();
v1 = scale_functor(v1, static_cast<FT>(1.0 / CGAL::sqrt(v1.squared_length())));
v2 = scale_functor(v2, static_cast<FT>(1.0 / CGAL::sqrt(v2.squared_length())));
v1 = scale_functor(v1, FT(1.0 / CGAL::sqrt(v1.squared_length())));
v2 = scale_functor(v2, FT(1.0 / CGAL::sqrt(v2.squared_length())));
std::vector<std::pair<double, double> > ray_distances;
ray_distances.reserve(disk_samples.size());
@ -268,7 +282,7 @@ public:
const FT normal_multiplier( cos(cone_angle / 2.0) );
const FT disk_multiplier ( sin(cone_angle / 2.0) );
Vector scaled_normal = scale_functor(normal, normal_multiplier);
const Vector& scaled_normal = scale_functor(normal, normal_multiplier);
for(Disk_samples_list::const_iterator sample_it = disk_samples.begin();
sample_it != disk_samples.end(); ++sample_it) {
@ -277,20 +291,38 @@ public:
Primitive_id closest_id;
Vector disk_vector = sum_functor(
scale_functor(v1, static_cast<FT>(disk_multiplier * sample_it->get<0>())),
scale_functor(v2, static_cast<FT>(disk_multiplier * sample_it->get<1>())) );
scale_functor(v1, FT(disk_multiplier * sample_it->get<0>())),
scale_functor(v2, FT(disk_multiplier * sample_it->get<1>())) );
Vector ray_direction = sum_functor(scaled_normal, disk_vector);
Ray ray(center, ray_direction);
if(use_diagonal) {
FT max_distance( max_diagonal / std::sqrt(ray_direction.squared_length()));
const Vector& scaled_direction = scale_functor(ray_direction, max_distance);
const Vector& target_vector = sum_functor( Vector(Point(ORIGIN), center),
scaled_direction);
const Point& target_point = translated_point_functor(Point(ORIGIN),
target_vector);
Segment segment(center, target_point);
if(traits.is_degenerate_3_object()(ray)) {
CGAL_warning(false &&
"A degenerate ray is constructed. Most probable reason is using CGAL_PI as cone_angle parameter and also picking center of disk as a sample.");
if(traits.is_degenerate_3_object()(segment)) {
CGAL_warning(false &&
"A degenerate segment is constructed. Most probable reason is using CGAL_PI as cone_angle parameter and also picking center of disk as a sample.");
}
boost::tie(is_intersected, intersection_is_acute, min_distance, closest_id)
= cast_and_return_minimum(segment, skip, accept_if_acute);
} else {
Ray ray(center, ray_direction);
if(traits.is_degenerate_3_object()(ray)) {
CGAL_warning(false &&
"A degenerate ray is constructed. Most probable reason is using CGAL_PI as cone_angle parameter and also picking center of disk as a sample.");
}
boost::tie(is_intersected, intersection_is_acute, min_distance, closest_id)
= cast_and_return_minimum(ray, skip, accept_if_acute);
}
boost::tie(is_intersected, intersection_is_acute, min_distance, closest_id)
= cast_and_return_minimum(ray, skip, accept_if_acute);
if(!intersection_is_acute) {
continue;
}

5
Surface_mesh_segmentation/include/CGAL/internal/Surface_mesh_segmentation/Surface_mesh_segmentation.h
View File

@ -96,8 +96,9 @@ public:
calculate_sdf_values(double cone_angle, int number_of_rays,
SDFPropertyMap sdf_pmap) {
// calculate sdf values
SDF_calculation_class(mesh, traits).calculate_sdf_values(cone_angle,
number_of_rays, sdf_pmap);
SDF_calculation_class sdf_calculator(mesh, false, true, traits);
sdf_calculator.calculate_sdf_values(mesh.facets_begin(), mesh.facets_end(),
cone_angle, number_of_rays, sdf_pmap);
// apply post-processing steps
check_zero_sdf_values(sdf_pmap);
Filter()(mesh, get_window_size(), sdf_pmap);