Rbanh
0798aa5d57
Add dedicated skinned rendering, pose restoration, shared Material and Material Instance slots, registry-driven components, Surface/Solari integration, transactional schema upgrades, navigation authoring, documentation, and evaluation evidence.
1.4 KiB
ADR 0021: Brush Authoring Schema
Status
Accepted
Context
Jackdaw roadmap work needs blockout geometry that is editable as authored data, survives scene saves, hydrates into runtime render/physics components, and can later support face/edge/vertex tools and CSG operators. Treating brushes as imported static meshes would hide the authoring intent and make later geometry edits depend on generated artifacts.
Decision
Add ActorKind::Brush and BrushDesc as persisted shared authoring data. A brush stores convex polygon faces with stable face IDs, plane data, material/texture references, UV parameters, smoothing group, and shadow flags. The MVP supports additive cube brushes and hydrates active brush components into generated mesh children; generated children are stripped from saved scenes.
Brush actors conflict with Primitive, StaticMeshRenderer, SkinnedMeshRenderer, LightDesc,
and ModelRef in actor validation. Scene v1-to-v2 kind backfill infers ActorKind::Brush when an
older level object contains BrushDesc.
Consequences
Brush geometry is now a first-class scene authoring type rather than a renderer slot variant. Future face editing, clipping, and CSG tools should mutate BrushDesc and rebuild the generated preview mesh through hydration.
The MVP intentionally does not implement viewport face/edge/vertex tools, non-convex validation UI, or subtractive CSG evaluation. Those remain roadmap work.