[Blender x Python] Let's master the material !!

table of contents

0. How to add a material
1. Let's make a glass material !!
2. Let's make metallic !!
3. Add text !!
4. English words

• Since there are few explanations this time, we do not summarize only the sample code.

0. How to add a material

0-1. Procedure for adding materials

① Create a new material ② Make the node available ③ Add an object ④ Set the value of the node ⑤ Apply the material to the object

0-2. Contents of Principled BSDF

◯ Each item of the node is assigned a number in order from 0. This time, I will explain using Principled BSDF.

Base Color→0 Subsurface→1 : Metallic→4 : Roughness→7 : Transmission→15

It looks like this.

◯ Use this to specify as nodes [" Principled BSDF"]. Inputs [0].

1. Let's make a glass material !!

◯ A program to make a simple glass ico_sphere

import bpy

#Create a new material
material_glass = bpy.data.materials.new('Green')
#Make the node available
material_glass.use_nodes = True
#Add an object
bpy.ops.mesh.primitive_ico_sphere_add(subdivisions=1, enter_editmode=False, align='WORLD', location=(0, 0, 0), scale=(1, 1, 1))

#Set the value of the node
#Variable p_Create BSDF to reduce the amount of writing
p_BSDF = material_glass.node_tree.nodes["Principled BSDF"]
#0→BaseColor/7→roughness(=Roughness)/15→transmission(=propagation)
#default_value = (R, G, B, A)
p_BSDF.inputs[0].default_value = (0, 1, 0, 1)
p_BSDF.inputs[7].default_value = 0
p_BSDF.inputs[15].default_value = 1
#Add a material element to an object
bpy.context.object.data.materials.append(material_glass)

◯ A program for arranging glass cubes in three dimensions

import bpy

for i in range(0,5):
    for j in range(0,5):
        for k in range(0,5):
            #Create a new material
            material_glass = bpy.data.materials.new('Red')
            #Make the node available
            material_glass.use_nodes = True
            bpy.ops.mesh.primitive_cube_add(
                size=0.8,
                #Determine the length, width, and height of each
                location=(i, j, k),
                )
            p_BSDF = material_glass.node_tree.nodes["Principled BSDF"]
            p_BSDF.inputs[0].default_value = (1, 0, 0, 1)
            p_BSDF.inputs[7].default_value = 0
            p_BSDF.inputs[15].default_value = 1
            bpy.context.object.data.materials.append(material_glass)

2. Let's make metallic !!

◯ A program that arranges metallic ico_spehre

import bpy

#Repeat processing 6 times
for i in range(0,6):
    #Create a new material
    material_glass = bpy.data.materials.new('Blue')
    #Make the node available
    material_glass.use_nodes = True
    #ico_Function to add sphere
    bpy.ops.mesh.primitive_ico_sphere_add(
        #Make it smoother and smoother
        subdivisions=i+1,
        location=(i, 0, 0),
        scale=(0.7, 0.7, 0.7)
        )
    p_BSDF = material_glass.node_tree.nodes["Principled BSDF"]
    #0→BaseColor/4→Metallic(=metal)/7→roughness(=Roughness)
    p_BSDF.inputs[0].default_value = (0, 0, 1, 0.5)
    p_BSDF.inputs[4].default_value = 1
    p_BSDF.inputs[7].default_value = 0
    #Add a material element to an object
    bpy.context.object.data.materials.append(material_glass)

◯ A program that changes colors little by little

You can change the color little by little by substituting i, which changes each time the process is repeated, into the color.

import bpy
import math
import random

for i in range(0,10):
    #Assign a random value from 0 to 1 to the variable num
    num = random.random()
    
    material_glass = bpy.data.materials.new('Blue')
    material_glass.use_nodes = True
    bpy.ops.mesh.primitive_torus_add(
        #180(Every time)×0~Random value of 1
        rotation=(math.pi * num, math.pi * num, 0),
        major_segments=64,
        minor_segments=3,
        major_radius=10-i,
        minor_radius=0.1,
         )
    p_BSDF = material_glass.node_tree.nodes["Principled BSDF"]
    p_BSDF.inputs[4].default_value = 1
    p_BSDF.inputs[7].default_value = 0
    p_BSDF.inputs[0].default_value = (0, 0, 1 - i/10, 1)
    bpy.context.object.data.materials.append(material_glass)

3. Add text !!

3-1. How to add text

◯ Enter simple text.

import bpy

#Add text so you can edit it in edit mode
bpy.ops.object.text_add(enter_editmode = True,location = (0,0,0))
#Delete the initial text
bpy.ops.font.delete(type = 'PREVIOUS_WORD')
#Enter text
bpy.ops.font.text_insert(text = 'Blender')
#Exit edit mode
bpy.ops.object.editmode_toggle()

3-1. Create metallic text

◯ Combine metallic material with text.

import bpy

material_glass = bpy.data.materials.new('Blue')
#Make the node available
material_glass.use_nodes = True

#Add text so you can edit it in edit mode
bpy.ops.object.text_add(enter_editmode = True,location = (0,0,0))
#Delete the initial text
bpy.ops.font.delete(type = 'PREVIOUS_WORD')
#Enter text
bpy.ops.font.text_insert(text = 'Blender')
#Exit edit mode
bpy.ops.object.editmode_toggle()

#Play with nodes
p_BSDF = material_glass.node_tree.nodes["Principled BSDF"]
p_BSDF.inputs[4].default_value = 1
p_BSDF.inputs[7].default_value = 0
p_BSDF.inputs[0].default_value = (0, 0, 1, 1)
bpy.context.object.data.materials.append(material_glass)

4. English words