@ifc-lite/lens

Rule-based 3D filtering and colorization for IFC models. A pure, framework-agnostic evaluation engine: you define lenses whose rules match entities by IFC class, property value, material, or classification, and apply visual actions (colorize, hide, make transparent). The engine has zero dependencies and reads model data through a small LensDataProvider interface, so it works with any data store.

Install

npm install @ifc-lite/lens

Usage

import { evaluateLens, BUILTIN_LENSES } from '@ifc-lite/lens';
import type { LensDataProvider } from '@ifc-lite/lens';

const provider: LensDataProvider = createMyProvider(myData);
const result = evaluateLens(BUILTIN_LENSES[0], provider);
// result.colorMap   - Map<globalId, RGBAColor>
// result.hiddenIds  - Set<globalId>
// result.ruleCounts - Map<ruleId, count>

Features

• evaluateLens / evaluateAutoColorLens: turn a Lens definition into color and visibility maps
• Auto-color mode: assign distinct colors per IFC class, property value, or material automatically, with a generated legend
• matchesCriteria for standalone rule matching
• BUILTIN_LENSES presets (for example "By IFC Class")
• discoverClasses / discoverDataSources to populate lens editors from model data
• Color helpers: hexToRgba, rgbaToHex, uniqueColor, GHOST_COLOR, LENS_PALETTE
• Fully typed: Lens, LensRule, LensCriteria, LensEvaluationResult, RGBAColor

Links

• Docs: https://ifclite.dev/docs/
• Source: https://github.com/LTplus-AG/ifc-lite

License

MPL-2.0