SkyDome — Isotropic Overcast Sky
| Class | SkyDome |
| Family | Discrete light array (72 Turtle-geometry directional lights) |
| Standard | CIE Overcast (isotropic, type 1) |
Introduction
The SkyDome approximates an isotropic overcast sky using 72 directional lights arranged in the Turtle geometry (equal solid-angle sectors).
All lights have equal intensity, resulting in a perfectly diffuse illumination from the full hemisphere.
This is the simplest sky model and is appropriate for studies where sky radiance anisotropy is not important.
Parameters
| Parameter | Type | Default | Description |
|---|
| power | float | 300 W/m² | Total irradiance from the sky hemisphere (W/m²). Typical overcast global irradiance is 100–400 W/m². |
Renderer compatibility
| Twilight (Sunflow) | ✅ |
| GPUFlux | ✅ |
| OpenGL / Proteus | ✅ |
Notes
Because SkyDome uses discrete directional lights, it works in any renderer without requiring an environment map bake step. No background sky colour is produced in rendered images. It is computationally very cheap and suitable for large simulation batches.