NavMesh pathfinding: automatic NPC navigation
One of the most practical additions in the WWDC 2026 "Explore advances in RealityKit" session is native navigation mesh support. RealityKit can now automatically generate a navigation map from scene geometry, allowing characters and NPCs to traverse complex environments without manual path management. In gaming and training applications this substantially reduces implementation overhead.
Lightmaps and indirect lighting in Reality Composer Pro 3
RealityKit now supports attaching lightmap textures for indirect lighting, ambient occlusion, and beauty passes. Apple recommends using the new light baker built into Reality Composer Pro 3 to generate these maps, achieving reflected-light effects in interiors that previously required external solutions. The API now formally distinguishes between static lighting (handled by lightmaps) and dynamic lighting (covered by the previously announced soft shadows).
Reverb meshes and configurable spatial audio
On the audio side, RealityKit introduces customizable reverb meshes: rather than relying on automatic reverb computed from visible geometry, a developer can define exactly which volume of the environment contributes to echo and sound reflection. The result is more consistent spatial audio in mixed reality scenes where visual and acoustic geometry do not perfectly coincide.
All these capabilities are documented in the official Apple Developer session video, adding to cloth simulations, Gaussian splats, and soft shadows already announced, together outlining a substantial update to Apple's cross-platform 3D engine.