Blacksite/docs/editor/brushes.md

Brush Authoring

Brushes are persisted blockout geometry stored as ActorKind::Brush + BrushDesc.

MVP Scope

• BrushDesc::default() creates an additive cube brush.
• Each face stores a stable ID, plane, vertices, optional material/texture refs, UV offset/scale/rotation, and smoothing group.
• Hydration builds generated mesh children from active brush components and strips those children before scene save.
• Brush actors validate separately from primitives and imported/static mesh actors.
• The Actor Inspector Add Component shelf can add a Brush component. The Brush card exposes kind, face count, shadow flags, and cube reset.

Current Limits

• Only convex authored faces are supported by the mesh builder.
• Subtractive brushes are stored as markers but are not evaluated as CSG.
• Face, edge, vertex, clipping, and primitive brush creation tools are future roadmap work.