Unity Grease Pencil & Silhouette Renderer (WIP)

This is a work-in-progress project exploring NPR (Non-Photorealistic Rendering) techniques in Unity. It currently consists of a renderer for Blender's Grease Pencil data and a system for real-time silhouette edge detection.

Features

Grease Pencil Support

• Data Structure: GreasePencilSO ScriptableObjects are used to hold Grease Pencil data, including layers, frames, strokes, and materials.
  • Note: The importer script to bring data from Blender into Unity is not currently included in this repository.
• Rendering: The GreasePencilRenderer component handles the rendering of the stored stroke data using procedural geometry and Compute Buffers.
• Animation: Basic support for frame-by-frame animation playback.

Silhouette Rendering

• Edge Detection: The SilhouetteEdgeCalculator component detects silhouette edges on 3D meshes in real-time.
• Compute Shaders: Uses Compute Shaders for finding edges, calculating adjacency, and linking edges into strokes.
• Stroke Rendering: The SilhouetteRenderer renders the detected edges as strokes, utilizing the same rendering logic as the Grease Pencil system.

Getting Started

Grease Pencil

1. Create or obtain a GreasePencilData asset (requires external data).
2. Create a GameObject and add the GreasePencilRenderer component.
3. Assign the GreasePencilData asset to the renderer.
4. Configure material settings.

Silhouette

1. Create a GameObject with a MeshFilter and MeshRenderer.
2. Add the SilhouetteEdgeCalculator component.
3. Add the SilhouetteRenderer component.
4. Assign a material.