[Paraview] Simple Visualization

[Lorenzo Isella]

Dear All,
I am a complete newbie in visualization, so an apology in advance is
what I ask will sound trivial.
I am browsing several Paraview tutorials, but I am missing out what I
really need.
Right now, I do NOT need e.g. to plot a temperature field on a metal
slab with a non-trivial geometry. Rather, I have a set of particles
(each is a simple sphere) in a 3D-box. The raw data is an ascii file
of the form:

x_1  y_1  z_1
x_2  y_2  z_2
.............
x_N  y_N  z_N

In each position {x_i,y_i,z_i} there is a sphere having radius 0.5.
Hence I do not have a grid but only a list of positions of some
spheres in space.
How should I deal with that in Paraview? Which format should I convert
my ascii file to?
In case it turns out to be useful to fix the ideas, I paste below an
example case with 50 particles (each line should contain three
numbers, but I do not know how it will be shown by your email client).
Many thanks

Lorenzo

5.488638491049999857e+01 4.533285539199999903e+01 5.990067340830000120e+01
5.507634645640000315e+01 4.690055020359999816e+01 6.205816942250000068e+01
5.611924302530000119e+01 4.584485860769999732e+01 6.292926739199999986e+01
5.641759022880000174e+01 4.340893347419999770e+01 5.895382539940000299e+01
5.693618177649999978e+01 4.489218829629999874e+01 6.410368616600000280e+01
5.555939302830000059e+01 4.362780979029999884e+01 5.951328359800000101e+01
5.554350617000000057e+01 4.188482518459999682e+01 5.878381606479999988e+01
5.604427505559999645e+01 4.649609805720000111e+01 6.210705354470000117e+01
5.530048293149999949e+01 4.624494566079999913e+01 5.959863344469999902e+01
5.467705995490995718e+01 4.355678678950000204e+01 5.875568285069999774e+01
5.621869458380000140e+01 4.439583221640000232e+01 5.924903889080000141e+01
5.561998122079999973e+01 4.394605972949999995e+01 5.851489735050000007e+01
5.690921858690000334e+01 4.582500510620000256e+01 6.362092096509999806e+01
5.475098914309999998e+01 4.619126324740000200e+01 6.049120611730000263e+01
5.641635311080000292e+01 4.243341419539999748e+01 5.854919389150000342e+01
5.621830122240000094e+01 3.991548769199999924e+01 5.863887904930000161e+01
5.719361166030000021e+01 4.174063668590000020e+01 5.835930649010000337e+01
5.616689354599999717e+01 4.325470363480000202e+01 5.795258720969999899e+01
5.579069489220000122e+01 4.498163925800000129e+01 5.848915900779999788e+01
5.481830772069999824e+01 4.707179765050000242e+01 6.105822532359999855e+01
5.564110346620000058e+01 3.912246424140000300e+01 5.901021183169999773e+01
5.621457283520000203e+01 4.152797633419999812e+01 5.806957834979999689e+01
5.719488688780000274e+01 3.994124700609999934e+01 5.900162063970000048e+01
5.665532662689999910e+01 4.495426231879999790e+01 6.309290282119999915e+01
5.580952576610000193e+01 4.721484517420000060e+01 6.137584942670000032e+01
5.561332834329999741e+01 4.679007541709999884e+01 6.043663970149999898e+01
5.518545746840000277e+01 4.457136614680000264e+01 5.923679874550000335e+01
5.647997341979999675e+01 4.154384547210000278e+01 5.909534597060000038e+01
5.765199147479999908e+01 4.512795159830000102e+01 6.337497765989999721e+01
5.584302705049999815e+01 4.535378866500000328e+01 5.946951471839999925e+01
5.562396915850000312e+01 4.236937535799999921e+01 5.785716254439999773e+01
5.551942573040000184e+01 4.293100157170000131e+01 5.873180053770000342e+01
5.536439253620000045e+01 4.586432050150000350e+01 6.446544382109999560e+01
5.601580874620000117e+01 4.532177775110000084e+01 6.383980378760995222e+01
5.522183270229999863e+01 4.591330843859999788e+01 6.239036235070000203e+01
5.552475736130995188e+01 4.671884746799999988e+01 6.299182048400000156e+01
5.569300298889999823e+01 4.574124821929999740e+01 6.043186792259999862e+01
5.505789659319999885e+01 4.672642824350000268e+01 6.394446345749999949e+01
5.647888952489999781e+01 4.055610006399999889e+01 5.944827188789999894e+01
5.512435615700000113e+01 4.330096744890000338e+01 5.784002608130000311e+01
5.587834371390000143e+01 4.749533078369999828e+01 6.238585686929999952e+01
5.554561466909999723e+01 4.008492034519999692e+01 5.941969696160000325e+01
5.513332295810000261e+01 4.791230244629999646e+01 6.177737797679999687e+01
5.680377349180000124e+01 4.076690689720000194e+01 5.847625241530000295e+01
5.520251321359999963e+01 4.582912735579999719e+01 6.343219189789999746e+01
5.499600962339999910e+01 4.554144637859999989e+01 5.888039144079999687e+01
5.577575750479999783e+01 4.085686345740000291e+01 5.873738147630000128e+01
5.603135377430000119e+01 4.636511701490000092e+01 6.383143826789999764e+01
5.642135364429999811e+01 3.952228659610000250e+01 5.958435845870000236e+01
5.541103635689999862e+01 4.624251213800000215e+01 6.131094504189999839e+01