NijiGPen: Blender Grease Pencil Add-on
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NijiGPen is a Blender add-on that brings new features to Grease Pencil for creating 2D graphic design and illustrations. It provides with the following functions:
- 2D algorithms for vector shapes and strokes (e.g., Boolean and Offset)
- Refinement and cleanup of hand-drawn 2D strokes
- 3D mesh/shading generation from 2D shapes
- Data exchange with other painting/designing tools
Installation
Requirement: Blender 3.3 ~ 4.2
[!NOTE] Currently, the support for Blender 4.3 with Grease Pencil 3.0 is still a work of progress, since massive updates are required. The next add-on release is scheduled in early December.
Please follow the steps in this page to finish the installation.
This add-on requires third-party Python packages. Please check these details if you have any questions during installation.
Features
Credits
The functions of this add-on are implemented with the following packages:
- Pyclipper wrapper by Maxime Chalton and the Clipper library by Angus Johnson
- Triangle by Dzhelil Rufat and Jonathan Richard Shewchuk
- SciPy
- Scikit-image
Besides, although not using the codes directly or implementing the same algorithm, the functions of this add-on are largely inspired by the following works:
- Lee, In-Kwon. "Curve reconstruction from unorganized points." Computer aided geometric design 17, no. 2 (2000): 161-177.
- Liu, Chenxi, Enrique Rosales, and Alla Sheffer. "Strokeaggregator: Consolidating raw sketches into artist-intended curve drawings." ACM Transactions on Graphics (TOG) 37, no. 4 (2018): 1-15.
- Dvorožňák, Marek, Daniel Sýkora, Cassidy Curtis, Brian Curless, Olga Sorkine-Hornung, and David Salesin. "Monster mash: a single-view approach to casual 3D modeling and animation." ACM Transactions on Graphics (TOG) 39, no. 6 (2020): 1-12.
- Johnston, Scott F. "Lumo: illumination for cel animation." In Proceedings of the 2nd international symposium on Non-photorealistic animation and rendering, pp. 45-ff. 2002.
- Hudon, Matis, Sebastian Lutz, Rafael Pagés, and Aljosa Smolic. "Augmenting hand-drawn art with global illumination effects through surface inflation." In Proceedings of the 16th ACM SIGGRAPH European Conference on Visual Media Production, pp. 1-9. 2019.
- Sýkora, Daniel, John Dingliana, and Steven Collins. "Lazybrush: Flexible painting tool for hand‐drawn cartoons." In Computer Graphics Forum, vol. 28, no. 2, pp. 599-608. Oxford, UK: Blackwell Publishing Ltd, 2009.
- Parakkat, Amal Dev, Pooran Memari, and Marie‐Paule Cani. "Delaunay Painting: Perceptual Image Colouring from Raster Contours with Gaps." In Computer Graphics Forum, vol. 41, no. 6, pp. 166-181. 2022.