CODEWITHSUNDEEP
pythonblender
ofey
ofey

Reputation: 3337

Generate a cube in Blender Python

I am using Blender 3.0 on Ubuntu 21,10 Why is this code not working? I am trying to randomly generate the x, y and z values of the six vertices of a cube and create it.

This code was inspired by Chris Holt's here https://youtu.be/mljWBuj0Gho

import bpy import random name="New Object" verts=[] edges=[] faces=[]

bed = 300 #in mm print("bed = " + str(bed))

xmin = -bed/2 ymin = -bed/2 zmin = -bed/2 xmax = bed/2 ymax = bed/2 zmax = bed/2

print("xmin" + str(xmin)) print("xmax" + str(xmax)) print("ymin" + str(ymin)) print("ymax" + str(ymax)) print("zmin" + str(zmin)) print("zmax" + str(zmax))

generate coordinates

top left back

a1= random.randint(xmin,0) a2 = random.randint(ymin,0) a3 = random.randint(0,zmax)

top right back

b1 = random.randint(xmin,0) b2 = random.randint(0,ymax) b3 = random.randint(0,zmax)

top right front

c1 = random.randint(0,xmax) c2 = random.randint(0,ymax) c3 = random.randint(0,zmax)

top left front

d1 = random.randint(0,xmax) d2 = random.randint(ymin,0) d3 = random.randint(0,zmax)

bottom left back

e1 = random.randint(xmin,0) e2 = random.randint(ymin,0) e3 = random.randint(zmin,0)

bottom right back

f1 = random.randint(xmin,0) f2 = random.randint(0,ymax) f3 = random.randint(zmin,0)

bottom right front

g1 = random.randint(0,xmax) g2 = random.randint(0,ymax) g3 = random.randint(zmin,0) xmax

bottom left front

h1 = random.randint(0,xmax) h2 = random.randint(ymin,0) h3 = random.randint(zmin,0)

print("\n") print("\n") print(" a1 =" + str(a1)) print("a2 = " + str(a2)) print("a3 = " + str(a3))

print("\n") print("b1 = " + str(b1)) print("b2 = " + str(b2)) print("b3 = " + str(b3))

print("\n") print("c1 = " + str(c1)) print("c2 = " + str(c2)) print("c3 = " + str(c3))

print("\n") print("d1 = " + str(d1)) print("d2 = " + str(d2)) print("d3 = " + str(d3))

print("\n") print("e1 = " + str(a1)) print("e2 = " + str(e2)) print("e3 = " + str(e3))

print("\n") print("f 1= " + str(f1)) print("f 2 = " + str(f2)) print("f3 = " + str(f3))

print("\n") print("g1 = " + str(g1)) print("g2 = " + str(g2)) print("g3 = " + str(g3))

print("\n") print("h1 = " + str(h1)) print("h2 = " + str(h2)) print("h3 = " + str(h3)) print("end")

#8 vertices verts.append([# index 0 a1, #x a2, #y a3 #z ]) verts.append([# index 1 b1, #x b2, #y b3 #z ]) verts.append([# index 2 c1, #x c2, #y c3 #z ]) verts.append([# index 3 d1, # d2, #y d3 #z ]) verts.append([# index 4 e1, #x e2, #y e3 #z ]) verts.append([# index 5 f1, #x f2, #y f3 #z ]) verts.append([# index 6 g1, #x g2, #y g3 #z ]) verts.append([# index 7 h1, #x h2, #y h3 #z ])

#12 edges #top edges.append([0,1]) edges.append([1,2]) edges.append([2,3]) edges.append([3,0]) #bottom edges.append([4,5]) edges.append([5,6]) edges.append([6,7]) edges.append([7,4]) #connections edges.append([0,4]) edges.append([1,5]) edges.append([2,6]) edges.append([3,7])

print(verts[7]) print(edges[0])

#6 facess #top faces.append([0,1,2,3]) #bottom faces.append([4,5,6,7]) #side

back

faces.append([2,6,10,11])

front

faces.append([0,1,4,5])

side right

faces.append([1,2,5,6])

side left

faces.append([0,3,4,7])

print"faces[1] = " + str(faces[1])) # doesn't work

print(faces[1])

mesh=bpy.data.meshes.new(name) print("mesh = " + str(mesh)) obj=bpy.data.objects.new(name,mesh) print("obj = " + str(obj)) col=bpy.data.collections.get("Collection") print("col = " + str(col)) col.objects.link(obj) bpy.context.view_layer.objects.active=obj #mesh.from_pydata(verts,edges,faces)mod_skin = obj.modifiers.new('Skin', 'SKIN')

The error message I am getting is

Traceback (most recent call last): File "/dem.py", line 188, in AttributeError: 'NoneType' object has no attribute 'objects' Error: Python script failed, check the message in the system console

Upvotes: 0

Views: 972

Answers (1)

phoney_badger
phoney_badger

Reputation: 533

The bpy.data.collections returns a bpy.prop_collection in which you can search by key, using the get() method. Here you seem to be searching for a key that doesn't exist. Which is returning None and hence your error.

On iterating through the bpy.data.collections object using a for loop

for collection in bpy.data.collections:
    print(collection)

you can see that the only member is

<bpy_struct, Collection("Collection") at 0x7f20e4359848>

This is just the default collection that blender has when you open a new project. If you create a new collection named "Collection 2" or something the for loop will give you another collection object.

so perhaps what you meant is

bpy.data.collections.get("Collection")

which will give you the default collection?

Upvotes: 1

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