🚗 Blender Car Damage Masking

Synthetic Data Generation Using Blender and python. Read # Documentation File before going into it This project demonstrates how to add realistic car damage (dents, scratches, dirt, and cracks) in Blender using assets, procedural textures, and a Python script.

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📌 Table of Contents

• Introduction
• Prerequisites
• Importing the Car Model
• Importing Assets
• Running the Python Script
• Changing the Mode Switcher Node
• Creating Damages
• Applying Dirt Texture
• Applying the HDRI Dome
• Generation
• Unresolved Challenges
• Specific Problems
• Resources

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📖 Introduction

This guide walks you through the process of adding damage masks (dents, scratches, cracks, dirt) to a car model in Blender.
The workflow uses:

• Blender shaders & assets
• A custom Python script
• Rendering with Cycles Engine

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⚙️ Prerequisites

• Blender 4.1+ installed
• Car model file (download or import from BlenderKit)
• Render engine: Cycles
• Assets available via Blender Asset Browser

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🚙 Importing the Car Model

You have two options:

Option 1: Import from File

1. Open Blender
2. Go to File > Import and select your car model format
3. Import it into Blender

Option 2: Using BlenderKit Addon

1. Download and install the BlenderKit addon
2. Enable it in Edit > Preferences > Add-ons
3. Search for "Car" in BlenderKit
4. Click to import into your scene

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🎨 Importing Assets

1. Open the Asset Browser
2. Drag & drop desired assets (scratches, dents, textures) onto the car model

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🐍 Running the Python Script

1. Switch to the Scripting workspace
2. Run the provided Python script (link in resources)

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🔄 Changing the Mode Switcher Node

1. Open the Shading tab > Shader Editor
2. Locate the Mode Switcher node
3. Replace it with the latest version if missing

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🛠️ Creating Damages

• Dents → Adjust Voronoi Texture + Mapping node scales
• Scratches → Modify values in mapping nodes
• Glass Cracks → Add crack texture nodes

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🌫 Applying Dirt Texture

Follow this tutorial:
Simple Dirt & Dust in Blender

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🌎 Applying the HDRI Dome

• Use a dome HDRI instead of world HDRI
• Benefits: Keeps car aligned with ground plane
• Tutorial: HDRI Dome Tutorial (6:03 - 17:38)

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🖼️ Generation

1. Set the number of samples
2. Click Generate to render and save

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⚠️ Unresolved Challenges

• Needs better procedural dents & scratches
• Lighting doesn’t always match background
• Dents only randomize on one side
• Car reflections need improvement

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🐞 Specific Problems

• HDRI environment lacks detailing
• Geometry nodes need refinement
• Poor placement of dents

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📚 Resources

• Texture resource: Click Here
• Car Models:
  • Google Drive Collection
  • Sketchfab
  • Free3D
  • TurboSquid

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🏁 Conclusion

This project serves as a foundation for procedural car damage simulation in Blender.
Future improvements include better node setups, more realistic materials, and enhanced geometry-based denting.