Art with Math and Python (AMP)

Coding Python Support
21

i tested post # 12

with material var trico

and i get an error on this script
any update for this one ?

also for last script
you need to add an object and name it “six” ?

but still get an error
5.py", line 17, in <module>
KeyError: ‘bpy_prop_collection[key]: key “six” not found’

interesting way to make shapes !

thanks

22

@rickyblender, I didn’t have any issues with the script. Not sure what you’re doing wrong but worked perfectly for me.

@Dune2k, Cool script! I made a couple really simple changes to the script in #18, hope you don’t mind!

Nothing big, now works on any selected object (don’t need to rename it to “six”). And instead of duplicating the object, I changed bpy.ops.object.duplicate_move -> bpy.ops.object.duplicate_move_linked which creates and instance of the original object instead of a copy. That way you can change the shape of the original object and the rest change as well. Might be useful for motion graphics stuff I’ve been working on!

# Select the "six" object and duplicate it like a formula!
# Dune2k / Lars 2012

import bpy
from math import *
tau = 2*pi
    
the_object = bpy.context.active_object.name
    
if bpy.data.objects[the_object].select:
    
    six_len = (3**.5)        # x-size of hexagon
    total = 20               # amount of steps (&gt;40 will make PC crawl for a while)
    max_value = 2*tau        # max value for formula (&gt;tau is sea effect)
    steps = max_value/total
    scaler = 1              # scale formula (not used)
    
    for q in range(0,total):
        
        bpy.ops.object.select_all()
        bpy.data.objects[the_object].select = True
                
        for i in range(0,total):
            
            bpy.ops.object.select_all()
            bpy.data.objects[the_object].select = True
            
            
            if (-1)**q &lt; 0:
                x = six_len/2+six_len*i
                
            else:
                x = six_len*i 
                
            
            y = q*1.5
            z = sin(steps*i)+sin(steps*q)
            
            bpy.ops.object.duplicate_move_linked(TRANSFORM_OT_translate={"value":(x,y,z)})
23

as i run the script in post # 12 i get this error as indicated !

dont’ know why !

the last script seems to work ok now

salutations

24

@Rickyblender,
You get the error because the script requires you to have two materials with names. You can easily just make it create random materials and assign them like this.

import bpy, math, random
rows = 12
steps = math.pi/rows

mat1 = bpy.data.materials.new("Mat1")
mat1.diffuse_color = (random.random(), random.random(), random.random())
mat2 = bpy.data.materials.new("Mat2")
mat2.diffuse_color = (random.random(), random.random(), random.random())

for y in range(0,rows):
    
    for x in range(0,rows):
        
        ### setting up box stuff
        bpy.ops.mesh.primitive_cube_add(location= (x*steps,y*steps,0) )
        bpy.context.scene.cursor_location = bpy.context.active_object.location
        bpy.context.scene.cursor_location.z -= 1
        bpy.ops.object.origin_set(type='ORIGIN_CURSOR')
        
        ### determining boxes
        bpy.context.active_object.scale.x = steps/3 # change for space between cubes
        bpy.context.active_object.scale.y = steps/3
        
        ## the formula:
        bpy.context.active_object.scale.z = (math.exp((x*steps))+math.exp((y*steps)))*.1

        bpy.ops.object.material_slot_add()
        a = x
                  
        if (-1)**y &lt;= 0:
            a += 1
        
        if (-1)**a &lt;= 0:
            bpy.context.active_object.material_slots[0].material = mat1
        else:
            bpy.context.active_object.material_slots[0].material = mat2
25

I don’t mind at all, the whole idea of this topic was to spread and improve “Art with Math and Python”. Thank you for sharing the new script!