🌈 Spectral Rendering

Rendered Multispectral 3D Scenes Using Physical Illumination Models

This project demonstrates physically-based spectral rendering using spectral reflectance, spectral power distributions (SPDs), and camera spectral sensitivity models. The goal is to explore how varying illumination conditions impact the appearance of materials and the accuracy of color reproduction.

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🔬 Project Highlights

• Spectral Rendering Pipeline built with PBRT, Blender, and Python.
• Custom Materials designed using spectral BRDFs and real-world reflectance data.
• Illuminants modeled via real spectral power distributions (D65, Tungsten, etc.).
• Camera Simulation based on spectral sensitivity curves for realistic capture.
• Experiments conducted to evaluate material appearance shifts under different lighting.

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🗂 Repository Structure

Spectral-Rendering/
│
├── materials/         # Material definitions with spectral BRDFs
├── textures/          # Texture maps used in scenes
├── reflectance/       # Measured reflectance spectra
├── spds/              # Spectral Power Distributions of illuminants
├── geometry/          # Geometry and models (e.g., BMW M6)
├── experiments/       # Scene files with different material and light settings
├── images/            # Output renders and visualizations
├── .gitignore
├── BLENDSWAP_LICENSE.txt
├── README.md
└── *.pbrt             # PBRT scene configuration files

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🛠 Tools & Frameworks

• PBRT-v3/v4: Physically based rendering toolkit
• Blender: Geometry modeling and export
• Python: For data preprocessing and automation
• NumPy, Matplotlib: Spectral data manipulation and visualization

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🚀 Getting Started

1. Install PBRT (v3 or v4) from official repo.
2. Clone this repository:

   git clone https://github.com/huynhtruc0309/Spectral-Rendering.git
   cd Spectral-Rendering

3. Modify or create your own .pbrt scene files using provided materials and SPDs.
4. Run PBRT:

   pbrt bmw-m6-dragon_250.pbrt

5. Visualize output images and compare spectral effects.

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📊 Sample Results

Illuminant	Material: Mirror Coating
D65
D50

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📄 License

Geometry and assets from BlendSwap licensed under Creative Commons.
Other code and assets are for educational and non-commercial use only.

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✍️ Author

Jennie Truc Huynh
Master's in Computational Colour and Spectral Imaging
GitHub Profile