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Initial project import
2026-06-05 21:44:45 -04:00

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ADR 0017: Normalized Static Mesh Assets

Status

Accepted

Context

glTF/GLB and FBX previously entered the editor as imported scenes through ModelRef, with runtime hydration loading a format-specific SceneRoot. That path is still useful for full scene playback, but it makes ordinary static mesh placement depend on source format behavior and prevents the inspector from exposing a stable renderer component.

The editor needs model drag/drop to create editable static mesh actors by default, while retaining an explicit scene-instance path for animation, skinning, cameras, and other full-scene data.

Decision

Model imports now generate deterministic project artifacts under assets/meshes/generated/*.static_mesh.ron. The artifact records stable part IDs, source path, format, source fingerprint, import settings, mesh/material subasset labels, source node/material metadata, dependency paths, and warnings for metadata that is not played by the static mesh path.

The saved scene authoring component is StaticMeshRenderer. Its slots reference imported mesh/material assets by EditorAssetRef (asset_id + sub_asset_id) rather than source file paths. Hydration resolves those refs through the generated artifact, spawns runtime child Mesh3d parts, and strips/regenerates them like other hydrated ECS. Built-in primitives remain Primitive, and explicit full-scene placement remains ImportedModel + ModelRef.

Asset import settings choose the default placement mode:

  • StaticAsset creates ActorKind::StaticMesh + StaticMeshRenderer; when collider generation is enabled it also creates RigidBodyDesc + ColliderDesc::StaticMesh.
  • SceneInstance creates the legacy ActorKind::ImportedModel + ModelRef.

Hierarchy mode is also stored per asset. SingleActor places all mesh parts into one renderer. SourceHierarchy creates an authored root with child static mesh actors.

Consequences

  • glTF/GLB and FBX placement consume the same renderer contract after processing.
  • Scene files store renderer intent, not runtime Bevy mesh/material handles.
  • Static mesh actors can expose renderer slots, source labels, shadows, collider policy, and material overrides in the inspector.
  • Animated/skinned playback remains on the scene-instance path until a future animation authoring component exists.
  • Generated artifacts are project files but are hidden from the Asset Browser catalog to avoid treating them as levels/prefabs.