Blender 3D and python scripting - part 002.

In today's tutorial I will show you how to create a sphere and how to add a material to it.

The source code is very simple with two functions one is for the sphere and the second one is the material of this, see:

import bpy

def create_sphere(radius, distance_to_center, obj_name):

    obj = bpy.ops.mesh.primitive_uv_sphere_add(
        radius=radius,
        location=(distance_to_center, 0, 0),
        scale=(1, 1, 1)
    )
    # rename the object
    bpy.context.object.name = obj_name
    # return the object reference
    return bpy.context.object


def create_emission_shader(color, strength, mat_name):
    # create a new material shader
    mat = bpy.data.materials.new(mat_name)
    # enable the node-graph edition mode
    mat.use_nodes = True
    
    # clear all starter nodes
    nodes = mat.node_tree.nodes
    nodes.clear()

    # add the Emission node
    node_emission = nodes.new(type="ShaderNodeEmission")
    # (input[0] is the color)
    node_emission.inputs[0].default_value = color
    # (input[1] is the strength)
    node_emission.inputs[1].default_value = strength
    
    # add the Output node
    node_output = nodes.new(type="ShaderNodeOutputMaterial")
    
    # link the two nodes
    links = mat.node_tree.links
    link = links.new(node_emission.outputs[0], node_output.inputs[0])

    # return the material reference
    return mat

n = 1
r = 1.0
d = 1.5

sphere001 = create_sphere(r, d, "Sphere-{:02d}".format(n))

sphere001.data.materials.append(
    create_emission_shader(
        (1, 1, 1, 1), 100, "SphereMat001"
    )
)