[游戏开发]Python——PCL Kdtree用法

# -*- coding: utf-8 -*-
# http://pointclouds.org/documentation/tutorials/kdtree_search.php#kdtree-search

import numpy as np
import pcl
import random


def main():
    # srand (time (NULL));
    # pcl::PointCloud<pcl::PointXYZ>::Ptr cloud (new pcl::PointCloud<pcl::PointXYZ>);
    cloud = pcl.PointCloud()

    # // Generate pointcloud data
    # cloud->width = 1000;
    # cloud->height = 1;
    # cloud->points.resize (cloud->width * cloud->height);
    #
    # for (size_t i = 0; i < cloud->points.size (); ++i)
    # {
    # cloud->points[i].x = 1024.0f * rand () / (RAND_MAX + 1.0f);
    # cloud->points[i].y = 1024.0f * rand () / (RAND_MAX + 1.0f);
    # cloud->points[i].z = 1024.0f * rand () / (RAND_MAX + 1.0f);
    # }
    points = np.zeros((1000, 3), dtype=np.float32)
    RAND_MAX = 1024
    for i in range(0, 1000):
        points[i][0] = 1024 * random.random() / (RAND_MAX + 1.0)
        points[i][1] = 1024 * random.random() / (RAND_MAX + 1.0)
        points[i][2] = 1024 * random.random() / (RAND_MAX + 1.0)

    cloud.from_array(points)

    # pcl::KdTreeFLANN<pcl::PointXYZ> kdtree;
    # kdtree.setInputCloud (cloud);
    kdtree = cloud.make_kdtree_flann()

    # pcl::PointXYZ searchPoint;
    #
    # searchPoint.x = 1024.0f * rand () / (RAND_MAX + 1.0f);
    # searchPoint.y = 1024.0f * rand () / (RAND_MAX + 1.0f);
    # searchPoint.z = 1024.0f * rand () / (RAND_MAX + 1.0f);
    searchPoint = pcl.PointCloud()
    searchPoints = np.zeros((1, 3), dtype=np.float32)
    searchPoints[0][0] = 1024 * random.random() / (RAND_MAX + 1.0)
    searchPoints[0][1] = 1024 * random.random() / (RAND_MAX + 1.0)
    searchPoints[0][2] = 1024 * random.random() / (RAND_MAX + 1.0)

    searchPoint.from_array(searchPoints)

    # // K nearest neighbor search
    # int K = 10;
    K = 10

    # std::vector<int> pointIdxNKNSearch(K);
    # std::vector<float> pointNKNSquaredDistance(K);
    #
    # std::cout << "K nearest neighbor search at (" << searchPoint.x
    #         << " " << searchPoint.y
    #         << " " << searchPoint.z
    #         << ") with K=" << K << std::endl;
    # print ('K nearest neighbor search at (' + searchPoint[0][0] + ' ' + searchPoint[0][1] + ' ' + searchPoint[0][2] + ') with K=' + str(K))
    print('K nearest neighbor search at (' + str(searchPoint[0][0]) + ' ' + str(
        searchPoint[0][1]) + ' ' + str(searchPoint[0][2]) + ') with K=' + str(K))

    # if ( kdtree.nearestKSearch (searchPoint, K, pointIdxNKNSearch, pointNKNSquaredDistance) > 0 )
    # {
    # for (size_t i = 0; i < pointIdxNKNSearch.size (); ++i)
    #   std::cout << "    "  <<   cloud->points[ pointIdxNKNSearch[i] ].x
    #             << " " << cloud->points[ pointIdxNKNSearch[i] ].y
    #             << " " << cloud->points[ pointIdxNKNSearch[i] ].z
    #             << " (squared distance: " << pointNKNSquaredDistance[i] << ")" << std::endl;
    # }
    [ind, sqdist] = kdtree.nearest_k_search_for_cloud(searchPoint, K)
    # if nearest_k_search_for_cloud
    for i in range(0, ind.size):
        print('(' + str(cloud[ind[0][i]][0]) + ' ' + str(cloud[ind[0][i]][1]) + ' ' + str(
            cloud[ind[0][i]][2]) + ' (squared distance: ' + str(sqdist[0][i]) + ')')

    # Neighbors within radius search
    # std::vector<int> pointIdxRadiusSearch;
    # std::vector<float> pointRadiusSquaredDistance;
    # float radius = 256.0f * rand () / (RAND_MAX + 1.0f);
    # std::cout << "Neighbors within radius search at (" << searchPoint.x
    #         << " " << searchPoint.y
    #       << " " << searchPoint.z
    #        << ") with radius=" << radius << std::endl;
    radius = 256.0 * random.random() / (RAND_MAX + 1.0)
    print('Neighbors within radius search at (' + str(searchPoint[0][0]) + ' ' + str(
        searchPoint[0][1]) + ' ' + str(searchPoint[0][2]) + ') with radius=' + str(radius))

    # if ( kdtree.radiusSearch (searchPoint, radius, pointIdxRadiusSearch, pointRadiusSquaredDistance) > 0 )
    # {
    # for (size_t i = 0; i < pointIdxRadiusSearch.size (); ++i)
    #   std::cout << "    "  <<   cloud->points[ pointIdxRadiusSearch[i] ].x
    #             << " " << cloud->points[ pointIdxRadiusSearch[i] ].y
    #             << " " << cloud->points[ pointIdxRadiusSearch[i] ].z
    #             << " (squared distance: " << pointRadiusSquaredDistance[i] << ")" << std::endl;
    # }
    # NotImplement radiusSearch
    [ind, sqdist] = kdtree.radius_search_for_cloud(searchPoint, radius)
    for i in range(0, ind.size):
        print('(' + str(cloud[ind[0][i]][0]) + ' ' + str(cloud[ind[0][i]][1]) + ' ' + str(
            cloud[ind[0][i]][2]) + ' (squared distance: ' + str(sqdist[0][i]) + ')')


if __name__ == "__main__":
    # import cProfile
    # cProfile.run('main()', sort='time')
    main()