Interface DirectionalLightOptions

Initial DirectionalLight.castShadow — §68's own example field, driving §69's machinery. Defaults to false; see the property.

Initial color, copied into the light's own array as linear-light RGB. A CSS string is parsed as sRGB and decoded first (§60a). Defaults to white [1, 1, 1], §68's own example value.

Initial DirectionalLight.intensity. Defaults to 1, so an unconfigured light contributes exactly its color (decision, 2026-08-04: §68's example intensity: 3 is illustrative and Appendix A pins no light defaults; 1 is the multiplicative identity).

Initial DirectionalLight.shadow settings (§69). Omitted fields take DirectionalLightShadow's documented defaults, and the record is constructed whether or not the light casts — so configuring a light before switching it on is a plain assignment rather than an allocation.