Unity Job System & Indirect Instancing Testbed

Testbed project exploring the performance of Unity's Job System / Burst compiler combined with GPU mesh instancing (using the DrawMeshInstancedIndirect function, and passing Job System's NativeArrays directly to the shaders as ComputeBuffers).

The functionality provided by this project is slowly becoming obsolete, as the Visual Effect Graph can handle at least an order of magnitude more particles at comparable frame rates.
It's still a good example for basic DOTS data generation & useful for situations where the use of GPU / VFX Graph is not preferred.

Tested on Unity 2022.1.2f1

Index

• Jobified Scripts
• Instanced Indirect Renderers
• Shaders

Modes

Currently 2 modes are explored:

• Particle Swarm
  524.288 Particles
  See it in action
• Animated Vector Field
  262.144 Vectors

Performance:

CPU: Intel i7 5930k, GPU: Nvidia GTX 970

Swarm:

524.288 Particles particles at 60-70 fps
1.048.576 Particles particles at 30 fps

Packages Used

• Unity.Jobs
• Unity.Collections
• Unity.Mathematics
• Unity.Burst
• Unity.PostProcessing

To Do

• Add support for HDRP and URP
• [Particle Swarm] Implement spatial binning using the Concurrent NativeMultiHashMap collection.
• [Particle Swarm] Implement flocking / Boid behaviour.
• [Particle Swarm] Implement Unity's ECS (Entity Component System)