| Model | Twilight (Sunflow) | GPUFlux | OpenGL / Proteus |
|---|---|---|---|
| Preetham | ✅ | ✅ (env-map bake) | background colour only |
| Hosek-Wilkie | ✅ | ✅ (env-map bake) | background colour only |
| Prague Sky Model | ✅ (Phase 1: Preetham fallback) | ✅ (Phase 1: fallback) | background colour only |
| SkyDome (Overcast) | ✅ | ✅ | ✅ |
| Perez All-Weather | ✅ | ✅ | ✅ |
| CIE Standard Sky | ✅ | ✅ | ✅ |