AlephPhysics

# Aleph.Physics – GPU-Accelerated Physics Simulation for Unity (URP)

Aleph.Physics is a high-performance, GPU-driven, lightweight physics simulation framework designed for Unity projects using the Universal Render Pipeline (URP). It provides a modular and flexible system for simulating medium-scale interactive objects entirely on the GPU, minimizing CPU overhead and enabling real-time performance.

The key design principle of Aleph.Physics is **not to achieve full physical accuracy**, but rather to provide **acceptable collisions** while focusing on easy integration into your game. Compared to existing particle or physics simulation systems, Aleph.Physics fills the gap between purely visual particle effects and interactive game physics.

### Collision and Interaction

Aleph.Physics offers robust collision detection and response, along with **GPU-to-CPU asynchronous feedback**, making it ideal for integrating GPU-based physics with CPU-driven game logic. Typically, game logic runs on the CPU, and particle effects are visual-only, but Aleph.Physics allows meaningful interactions between particles and game objects. It supports four types of collision and response:

1. **Particle-to-Particle**: Using GPU Bouding Volume Hierarchy, GPU ray tests, Minkowski Difference, and dynamic collision detection.

2. **Particle-to-Environment**: Using Signed Distance Fields (SDF) or bounding volume checks.

3. **Particle-to-GameObject**: Using GPU ray tests for static collision detection.

4. **Async Feedback**: GPU-to-CPU collision notifications for game logic execution.

All collision computations are performed asynchronously on the GPU for high performance.

### Visualization and Interaction

Aleph.Physics includes an **interactive UI** that visualizes the Bounding Volume Hierarchy (BVH) and supports step-by-step simulation for debugging and experimentation.

### Extensibility

The framework is fully **configurable and extendable**, allowing developers to integrate advanced physics systems into their projects with minimal setup while maintaining high GPU performance. You can customize solvers, forces, and collision behavior, making it suitable for games, simulations, or interactive visual effects.