Blender generator

generator.py

import bpy
from random import random as rnd

# Clean scene:
objs = bpy.data.objects
for e in objs:
    objs.remove(e, do_unlink=True)

spacing = 34
offset = 160
center = (2 * offset * -1, 2 * offset * -1, 2 * offset * -1)
for x in range(20):
    for y in range(20):
        # Randomize:
        lX = x * spacing
        lY = y * spacing
        lZ = rnd() * 480
        location = (lX + center[0], lY + center[1], lZ - 210)
        
        size = rnd() * 2
        scale = (size, size, rnd() * 20)
        
        # Draw object:
        bpy.ops.mesh.primitive_cube_add(size=2, enter_editmode=False, align='WORLD', location=location, scale=scale)
        
        # Randomize material for current object:
        item = bpy.context.object
        if rnd() < 0.33:
            item.data.materials.append(bpy.data.materials["Material.002"])
        elif rnd() > 0.33 and rnd() < 0.66:
            item.data.materials.append(bpy.data.materials["Material.003"])
        else:
            # Default material:
            item.data.materials.append(bpy.data.materials["Material.001"])