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#include "aabb.h"
#include "mesh.h"
#include <float.h>
namespace mingfx {
AABB::AABB() {
min_[0] = min_[1] = min_[2] = std::numeric_limits<float>::max();
max_[0] = max_[1] = max_[2] = -std::numeric_limits<float>::max();
user_data_ = 0;
}
AABB::AABB(const Point3 &a) {
min_ = a;
max_ = a;
user_data_ = 0;
}
AABB::AABB(const Vector3 &v) {
min_ = Point3(-0.5f*v[0], -0.5f*v[1], -0.5f*v[2]);
max_ = Point3( 0.5f*v[0], 0.5f*v[1], 0.5f*v[2]);
user_data_ = 0;
}
AABB::AABB(const Point3 &p, const Vector3 &v) {
min_ = Point3(p[0] - 0.5f*v[0], p[1] - 0.5f*v[1], p[2] - 0.5f*v[2]);
max_ = Point3(p[0] + 0.5f*v[0], p[1] + 0.5f*v[1], p[2] + 0.5f*v[2]);
user_data_ = 0;
}
AABB::AABB(const Point3 &a, const Point3 &b, const Point3 &c) {
min_ = a;
min_[0] = std::min(min_[0], b[0]);
min_[1] = std::min(min_[1], b[1]);
min_[2] = std::min(min_[2], b[2]);
min_[0] = std::min(min_[0], c[0]);
min_[1] = std::min(min_[1], c[1]);
min_[2] = std::min(min_[2], c[2]);
max_ = a;
max_[0] = std::max(max_[0], b[0]);
max_[1] = std::max(max_[1], b[1]);
max_[2] = std::max(max_[2], b[2]);
max_[0] = std::max(max_[0], c[0]);
max_[1] = std::max(max_[1], c[1]);
max_[2] = std::max(max_[2], c[2]);
user_data_ = 0;
}
AABB::AABB(const Mesh &mesh, unsigned int tri_id) {
std::vector<unsigned int> indices = mesh.read_triangle_indices_data(tri_id);
Point3 a = mesh.read_vertex_data(indices[0]);
Point3 b = mesh.read_vertex_data(indices[1]);
Point3 c = mesh.read_vertex_data(indices[2]);
min_ = a;
min_[0] = std::min(min_[0], b[0]);
min_[1] = std::min(min_[1], b[1]);
min_[2] = std::min(min_[2], b[2]);
min_[0] = std::min(min_[0], c[0]);
min_[1] = std::min(min_[1], c[1]);
min_[2] = std::min(min_[2], c[2]);
max_ = a;
max_[0] = std::max(max_[0], b[0]);
max_[1] = std::max(max_[1], b[1]);
max_[2] = std::max(max_[2], b[2]);
max_[0] = std::max(max_[0], c[0]);
max_[1] = std::max(max_[1], c[1]);
max_[2] = std::max(max_[2], c[2]);
user_data_ = 0;
}
AABB::AABB(const Mesh &mesh) {
min_[0] = min_[1] = min_[2] = std::numeric_limits<float>::max();
max_[0] = max_[1] = max_[2] = -std::numeric_limits<float>::max();
for (int i=0; i < mesh.num_vertices(); i++) {
Point3 a = mesh.read_vertex_data(i);
min_[0] = std::min(min_[0], a[0]);
min_[1] = std::min(min_[1], a[1]);
min_[2] = std::min(min_[2], a[2]);
max_[0] = std::max(max_[0], a[0]);
max_[1] = std::max(max_[1], a[1]);
max_[2] = std::max(max_[2], a[2]);
}
user_data_ = 0;
}
AABB::~AABB() {}
Vector3 AABB::Dimensions() const {
return max_ - min_;
}
float AABB::Volume() const {
if (max_[0] < min_[0]) {
// empty box
return -1.0;
}
Vector3 dims = max_ - min_;
return (dims[0] * dims[1] * dims[2]);
}
Point3 AABB::min() const {
return min_;
}
Point3 AABB::max() const {
return max_;
}
void AABB::set_user_data(int data) {
user_data_ = data;
}
int AABB::user_data() {
return user_data_;
}
// Compute an AABB that contains both A and B completely
AABB operator+(const AABB &A, const AABB &B) {
AABB C;
C.min_[0] = std::min(A.min_[0], B.min_[0]);
C.min_[1] = std::min(A.min_[1], B.min_[1]);
C.min_[2] = std::min(A.min_[2], B.min_[2]);
C.max_[0] = std::max(A.max_[0], B.max_[0]);
C.max_[1] = std::max(A.max_[1], B.max_[1]);
C.max_[2] = std::max(A.max_[2], B.max_[2]);
return C;
}
} // end namespace
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