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Custom Physics Systems vs Open Source Physics Engines

Developers should learn or use custom physics systems when standard physics engines like Unity's PhysX or Unreal Engine's Chaos are insufficient due to performance constraints, specific artistic goals, or specialized simulation needs meets developers should learn and use open source physics engines when building applications that require realistic physical interactions, such as video games, virtual reality experiences, scientific simulations, or robotics software. Here's our take.

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Custom Physics Systems

Developers should learn or use custom physics systems when standard physics engines like Unity's PhysX or Unreal Engine's Chaos are insufficient due to performance constraints, specific artistic goals, or specialized simulation needs

Custom Physics Systems

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Developers should learn or use custom physics systems when standard physics engines like Unity's PhysX or Unreal Engine's Chaos are insufficient due to performance constraints, specific artistic goals, or specialized simulation needs

Pros

  • +For example, in 2D platformers requiring pixel-perfect collision detection or VR applications demanding low-latency interactions, a custom system can provide finer control and optimization
  • +Related to: game-physics, collision-detection

Cons

  • -Specific tradeoffs depend on your use case

Open Source Physics Engines

Developers should learn and use open source physics engines when building applications that require realistic physical interactions, such as video games, virtual reality experiences, scientific simulations, or robotics software

Pros

  • +They are essential for creating immersive environments where objects behave according to physical laws, reducing development time by handling complex calculations like collision resolution and motion dynamics
  • +Related to: game-development, simulation-software

Cons

  • -Specific tradeoffs depend on your use case

The Verdict

These tools serve different purposes. Custom Physics Systems is a concept while Open Source Physics Engines is a library. We picked Custom Physics Systems based on overall popularity, but your choice depends on what you're building.

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The Bottom Line
Custom Physics Systems wins

Based on overall popularity. Custom Physics Systems is more widely used, but Open Source Physics Engines excels in its own space.

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Custom Physics Systems vs Open Source Physics Engines (2026) | Nice Pick