PointCloud sample

[feersantana5]

How can I sample a point cloud with N points??

[MeyerBuaharon]

I wrote a script that generates a ply file of two cubes that separate from each other with random colors:

import numpy as np
from plyfile import PlyData, PlyElement

n = 120000
x = np.random.uniform(low=-100.0, high=100.0, size=(n,))
y = np.random.uniform(low=-100.0, high=100.0, size=(n,))
z = np.random.uniform(low=-100.0, high=100.0, size=(n,))
x2 = x[:]
y2 = y[:] + 3
z2 = z[:]
x3 = np.concatenate((x, x2), axis=0)
y3 = np.concatenate((y, y2), axis=0)
z3 = np.concatenate((z, z2), axis=0)

red = np.random.randint(low=0, high=255, size=(n * 2,))
green = np.random.randint(low=0, high=255, size=(n * 2,))
blue = np.random.randint(low=0, high=255, size=(n * 2,))
vertices = np.empty(n * 2,
                    dtype=[('x', 'f4'), ('y', 'f4'), ('z', 'f4'), ('red', 'u1'), ('green', 'u1'),
                           ('blue', 'u1')])
vertices['x'] = x3.astype('f4')
vertices['y'] = y3.astype('f4')
vertices['z'] = z3.astype('f4')
vertices['red'] = red.astype('u1')
vertices['green'] = green.astype('u1')
vertices['blue'] = blue.astype('u1')

i = 1

while i <= 200:
    ply = PlyData([PlyElement.describe(vertices, 'vertex')], text=False)
    ply.write(str(i) + ".ply")
    print(i)
    x2 = x2[:]
    y2 = y2[:] + 3
    z2 = z2[:]
    x3 = np.concatenate((x, x2), axis=0)
    y3 = np.concatenate((y, y2), axis=0)
    z3 = np.concatenate((z, z2), axis=0)
    i += 1
    vertices['x'] = x3.astype('f4')
    vertices['y'] = y3.astype('f4')
    vertices['z'] = z3.astype('f4')

[germanros1987]

Probably you are looking for something like: http://www.open3d.org/docs/latest/python_api/open3d.geometry.PointCloud.html#open3d.geometry.PointCloud.farthest_point_down_sample