API Reference > imodeljs-frontend > Rendering > ParticleCollectionBuilderParams > size size size: number | Readonly<WritableXAndY> The default extents of the particle quad. Individual particles may apply a scale to these extents to produce particles of varying dimensions. Must be positive. Defined in core/frontend/src/render/ParticleCollectionBuilder.ts Line 34 Last Updated: 11 June, 2024