# How do create particle in Mayavi2

**Particle:**

A minute part or portion of matter; a morsel; a little bit; an atom; a jot; as, a particle of sand, of wood, of dust.

**How to define particle in Mayavi?**

In Mayavi, we can define a particle as glyphs (like points, arrows). It is very easy to plot a glyphs in Mayavi. Suppose, if we want to plot a points in mayavi, we have to provide two things that is ‘glyph type’ and ‘position’ where we have to plot.

**How to plot?**

enthought.mayavi.mlab has a function called points3d which used to plot glyphs (like points) at the specified position

**Function signatures**:

points3d(x, y, z...) points3d(x, y, z, s, ...)

x,y,z are the numpy arrays which are giving the position of the points. In addition we can pass 4th array s of the same shape of x,y,z which giving the scalar value of each points.

For example, If we need the plot a single point

import numpy from enthought.mayavi import mlab mlab.figure(1, bgcolor=(0, 0, 0), size=(350, 350)) mlab.clf() x = numpy.array([1]) y = numpy.array([1]) z = numpy.array([1]) mlab.points3d(x,y,z) mlab.show()

**Particle size:**

The 4th argument of points3d function ‘s’ used to define particle size. If all the particles are not same size , we need to give scalar value of each points. Take out the following example

x = [1, 2, 3, 4, 5, 6] y = [0, 0, 0, 0, 0, 0] z = y

If we represent a scalar varying from 0.5 to 1 on this dataset:

s = [.5, .6, .7, .8, .9, 1]

the scalar is mapped to diameter of the spheres

mlab.points3d(x, y, z, s)