Spark AR adds real-time physics engine for more convincing camera effects

Design · 3 min read

The new real-time physics engine in Spark AR lets creators simulate dynamics like soft-body deformation, particle interactions, and collision-based triggers directly in the effect editor. The engine is designed to run efficiently on mobile GPUs and includes simplified presets for creators new to physics.

Creators can bind physics-driven behaviors to facial expressions or gestures, enabling effects such as a scarf that reacts to head turns or particles that scatter when a user smiles. Spark AR's preview pipeline now supports frame-accurate playback so developers can iterate quickly.

Meta also added exportable physics profiles and tooling to analyze performance costs per effect. The company encouraged experimentation while warning creators to profile battery and thermal impacts carefully for older devices.