250 lines
7.1 KiB
C
250 lines
7.1 KiB
C
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/**
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* @file
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* @brief Efficient representation of an octree for ransac
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* @author Jan Elsberg. Automation Group, Jacobs University Bremen gGmbH, Germany.
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*/
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#ifndef RANSAC_OCTREE_H
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#define RANSAC_OCTREE_H
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#include <stdio.h>
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#include <vector>
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using std::vector;
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#include <deque>
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using std::deque;
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#include <set>
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using std::set;
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#include <list>
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using std::list;
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#include <iostream>
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#include <fstream>
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#include <string>
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#include "shapes/geom_math.h"
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#include "slam6d/globals.icc"
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#include "slam6d/Boctree.h"
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#include "shape.h"
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/**
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* @brief Octree
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*
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* A cubic bounding box is calculated
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* from the given 3D points. Then it
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* is recusivly subdivided into smaller
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* subboxes
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*/
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template <class T>
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class RansacOctTree : public BOctTree<T> {
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public:
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template <class P>
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RansacOctTree(P* const* pts, int n, T _voxelSize, PointType _pointtype = PointType() ) : BOctTree<T>(pts, n, _voxelSize, _pointtype) {}
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// RansacOctTree(vector<const T *> &pts, T voxelSize, PointType _pointtype = PointType() ) : BOctTree<T>(pts, voxelSize, _pointtype) {}
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RansacOctTree(std::string filename) : BOctTree<T> (filename) {}
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void DrawPoints(vector<T *> &p, unsigned char nrp) {
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DrawPoints(p, *BOctTree<T>::root, nrp);
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}
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unsigned long PointsOnShape(CollisionShape<T> &shape) {
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return PointsOnShape(*BOctTree<T>::root, BOctTree<T>::center, BOctTree<T>::size, shape);
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}
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void PointsOnShape(CollisionShape<T> &shape, vector<T *> &points) {
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PointsOnShape(*BOctTree<T>::root, BOctTree<T>::center, BOctTree<T>::size, shape, points);
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// exit(0);
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}
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protected:
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void showbits(char a)
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{
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int i , k , mask;
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for( i =7 ; i >= 0 ; i--)
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{
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mask = 1 << i;
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k = a & mask;
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if( k == 0)
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cout<<"0 ";
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else
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cout<<"1 ";
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}
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}
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long PointsOnShape(bitoct &node, T *center, T size, CollisionShape<T> &shape ) {
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if (! shape.isInCube(center[0], center[1], center[2], size)) {
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return 0;
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}
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T ccenter[3];
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bitunion<T> *children;
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bitoct::getChildren(node, children);
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/*
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printf("parent %p children: %p \n", &node, children);
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cout << " ";
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showbits(node.valid);
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cout << endl;
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cout << " ";
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showbits(node.leaf);
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cout << endl;
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*/
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long result = 0;
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// int r = 0;
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for (unsigned char i = 0; i < 8; i++) {
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if ( ( 1 << i ) & node.valid ) { // if ith node exists
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// printf("i: %u r: %d parent %p child[r]: %p \n", i, r, &node, children);
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// r++;
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childcenter(center, ccenter, size, i); // childrens center
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if ( ( 1 << i ) & node.leaf ) { // if ith node is leaf get center
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// check if leaf contains shape
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if ( shape.isInCube(ccenter[0], ccenter[1], ccenter[2], size/2.0) ) {
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pointrep *points = children->points;
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unsigned int length = points[0].length;
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T *point = &(points[1].v); // first point
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for(unsigned int iterator = 0; iterator < length; iterator++ ) {
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if ( shape.containsPoint(point) )
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result++;
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point+= BOctTree<T>::POINTDIM;
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}
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}
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} else { // recurse
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result += PointsOnShape( children->node, ccenter, size/2.0, shape);
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}
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++children; // next child
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}
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}
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return result;
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}
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void PointsOnShape(bitoct &node, T *center, T size, CollisionShape<T> &shape, vector<T*> &vpoints) {
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if (! shape.isInCube(center[0], center[1], center[2], size)) {
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return;
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}
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T ccenter[3];
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bitunion<T> *children;
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bitoct::getChildren(node, children);
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for (unsigned char i = 0; i < 8; i++) {
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if ( ( 1 << i ) & node.valid ) { // if ith node exists
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childcenter(center, ccenter, size, i); // childrens center
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if ( ( 1 << i ) & node.leaf ) { // if ith node is leaf get center
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// check if leaf contains shape
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if ( shape.isInCube(ccenter[0], ccenter[1], ccenter[2], size/2.0) ) {
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pointrep *points = children->points;
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unsigned int length = points[0].length;
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T *point = &(points[1].v); // first point
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for(unsigned int iterator = 0; iterator < length; iterator++ ) {
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// cerr << point[0] << " " << point[1] << " " << point[2] << endl;
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if ( shape.containsPoint(point) ) {
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T * p = new T[BOctTree<T>::POINTDIM];
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for (unsigned int iterator = 0; iterator < BOctTree<T>::POINTDIM; iterator++) {
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p[iterator] = point[iterator];
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}
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vpoints.push_back(p);
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}
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point+= BOctTree<T>::POINTDIM;
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}
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}
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} else { // recurse
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PointsOnShape( children->node, ccenter, size/2.0, shape, vpoints);
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}
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++children; // next child
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}
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}
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}
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void DrawPoints(vector<T *> &p, bitoct &node, unsigned char nrp) {
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bitunion<T> *children;
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bitoct::getChildren(node, children);
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unsigned char n_children = POPCOUNT(node.valid);
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unsigned char r = randUC(n_children);
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if (r == n_children) r--;
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/* cout << (unsigned int)r << " nc " << (unsigned int)n_children << endl;
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showbits(node.valid);
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cout << endl;
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showbits(node.leaf);
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cout << endl;
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*/
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bool leaf = false;
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unsigned char child_index = 0;
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/* if (r == 2) {
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for (unsigned char i = 0; i < 8; i++) {
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cout << "i " << (unsigned int)i << endl;
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if ( ( 1 << i ) & node.valid ) { // if ith node exists
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cout << "valid " << endl;
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if (child_index == r) {
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cout << "ci == r" << endl;
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if ( ( 1 << i ) & node.leaf ) { // if ith node exists
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cout << "leaf" << endl;
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leaf = true;
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}
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cout << "no leaf" << endl;
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break;
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}
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child_index++;
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}
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}
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} else {*/
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for (unsigned char i = 0; i < 8; i++) {
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if ( ( 1 << i ) & node.valid ) { // if ith node exists
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if (child_index == r) {
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if ( ( 1 << i ) & node.leaf ) { // if ith node exists
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leaf = true;
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}
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break;
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}
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child_index++;
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}
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}
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// }
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// cout << (unsigned int)r << " nc " << (unsigned int)n_children << " " << (unsigned int)child_index << endl;
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if (child_index != r) return; // bitmask valid might be all zero
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if (leaf) {
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/* cout << "STOPPED" << endl;
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return;*/
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pointrep *points = children[r].points;
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unsigned int length = points[0].length;
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if (length < nrp) return;
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if (length == nrp) {
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for (char c = 0; c < nrp; c++) {
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p.push_back(&(points[BOctTree<T>::POINTDIM*c+1].v));
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}
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return;
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}
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// randomly get nrp points, we will not check if this succeeds in getting nrp distinct points
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for (char c = 0; c < nrp; c++) {
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int tmp = rand(points[0].length);
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p.push_back(&(points[BOctTree<T>::POINTDIM*tmp+1].v));
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}
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} else {
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/* printf("r: %d parent %p children %p child[r]: %p \n", r, &node, children, &(children[r].node));
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showbits(node.valid);
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cout << endl;
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showbits(node.leaf);
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cout << endl;
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cout << "RECURSED" << endl;*/
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DrawPoints(p, children[r].node, nrp);
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}
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}
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};
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#endif
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