# Simple Cubic Lattice

Today, let’s have some fun playing with perspective rendering in Python! My graphics package of choice is VPython:

```
sudo apt-get install python-visual
```

Suppose we want to represent a simple cubic lattice: Using the `visual`

package, we can create a collection of spheres at positions ((i,j,k)) with (i,j,k = -L…L).

```
from visual import sphere
L = 5
R = 0.3
for i in range(-L,L+1):
for j in range(-L,L+1):
for k in range(-L,L+1):
sphere(pos=[i,j,k],radius=R)
```

Resulting in this beautiful rendering:

But what if we want to change the color? Simply alter the last line:

```
sphere(pos=[i,j,k],radius=R).color = color.blue
```

Less atoms? Alter the value of L.

`L = 1` |

Same number of atoms with smaller radii? Alter the value of R.

`R = 0.2` |

Written on November 8, 2013