Textured Triangle Rotation Animation Using Blender Python

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Textured Triangle with Noise & Rotation Animation Using Blender Python

A Sample Project from “Mastering Blender Python API”

If you’re exploring the powerful world of Blender’s Python API, this tutorial offers a small yet visually engaging example that blends geometry creation, material scripting, and animation—all programmatically. This is a preview of one of the practical projects featured in my book “Mastering Blender Python API.”

Whether you’re a beginner or an intermediate user, this project shows how to:

• Create a custom triangle mesh
• Apply noise-based procedural textures to each face
• Animate a rotation to showcase all sides

Step 1: Create the Triangle Mesh

We’ll begin by using bpy to create a simple triangle in the 3D viewport.

import bpy

# Clear the scene
bpy.ops.object.select_all(action='SELECT')
bpy.ops.object.delete(use_global=False)

# Create mesh and object
mesh = bpy.data.meshes.new(name="TriangleMesh")
obj = bpy.data.objects.new("Triangle", mesh)
bpy.context.collection.objects.link(obj)

# Define vertices and one triangular face
verts = [(1, 0, 0), (-1, 0, 0), (0, 1, 0)]
faces = [(0, 1, 2)]
mesh.from_pydata(verts, [], faces)
mesh.update()

Step 2: Apply Unique Noise Textures to Each Face

We’ll create materials programmatically and use Blender’s noise texture nodes for variety.

# Create and assign three materials with unique noise textures
for i in range(3):
    mat = bpy.data.materials.new(name=f"NoiseMaterial_{i}")
    mat.use_nodes = True
    nodes = mat.node_tree.nodes
    links = mat.node_tree.links

    noise = nodes.new('ShaderNodeTexNoise')
    bsdf = nodes.get("Principled BSDF")
    links.new(noise.outputs['Color'], bsdf.inputs['Base Color'])

    obj.data.materials.append(mat)

# Assign material to the triangle face
obj.data.polygons[0].material_index = 0

This ensures the one face has a rich, randomized pattern. For more faces, you’d assign a unique material index per face.

Step 3: Animate Rotation to View All Sides

Now let’s spin the triangle to see all sides using keyframes:

from math import radians

# Animate Z-axis rotation over 120 frames
for frame in range(0, 121, 40):
    obj.rotation_euler[2] = radians(frame)
    obj.keyframe_insert(data_path="rotation_euler", index=2, frame=frame)

You can preview the animation with the timeline or render it as an MP4/GIF to showcase.

Screenshots and Screencast

Below are some visual results from the final Blender project:

About the Book: “Mastering Blender Python API”

This example is just a taste of what you’ll learn in “Mastering Blender Python API”—a comprehensive guide covering:

• Mesh generation
• Materials and shaders
• Node automation
• Rigging and animation
• Scripting best practices

📖 Click here to learn more or purchase the book

Need Help or a Custom Tutorial?

If you’d like personal help with Blender scripting or Python development, I offer private 1-on-1 tutorials and custom project guidance.

✉ Contact Me:

• Website: Ojambo
• Services Form: Ojambo Services
• YouTube DM: @ojamboshop