Threejs Procedural Architecture

Procedural Architecture

Separate design planning from mesh emission. A building generator should produce an inspectable plan before it produces triangles.

Required architecture

settings
  → mass grammar
  → exposed-surface graph
  → façade/roof placements
  → module registry
  → material-slot mesh writer
  → geometries

Read references/grammar-and-mesh-compiler.md before implementing the generator.

Read the

procedural financial tower compiler

for seeded tier planning, semantic façade placement, reserved zones,

material-slot BufferGeometry output, projected detail, and mechanism-specific

diagnostics.

Rules

• Massing, façade rhythm, and detail modules are separate layers.
• Resolve exposed edges before façade placement. Do not decorate hidden internal faces.
• Modules own semantic anchors and construction depth, not global building coordinates.
• Compile by material slot to reduce draw calls without destroying material separation.
• Preserve real dimensions for floor height, bay width, trim projection, and texture density.
• Randomness may select among valid designs; it must not repair invalid geometry.
• Provide topology, façade ownership, material/geometry, and shadow diagnostics

appropriate to the renderer path.

Acceptance

The generated building must survive:

• silhouette-only view;
• flat untextured material;
• grazing light;
• close inspection of corners and roof transitions;
• seed variation without broken bays, overlapping ownership, or floating ornament;
• triangle and module-count reporting.

Routing boundary

Use $threejs-procedural-geometry for a reusable profile, sweep, ring, or mesh

writer without a building grammar. This skill owns massing, façade semantics,

architectural modules, and building-plan compilation.