Physical Sun/Sky

Adds a procedural sun and sky to the environment.

Sun Strength: Relative strength of the sun's illumination. It is recommended to use a low value (e.g. 0.1) to avoid over-exposure.

Sun Rotation: Rotation of the sun in the sky relative to the world origin where 0 degrees locates the sun at the positive Y world axis.

Sun Elevation: Elevation of the sun (in degrees) relative to the horizon. Sun/Sky Model: Nishita (Nishita et al. 1993.), Hosek-Wilkie (Hosek-Wilkie et al. 2012.), or Hosek-Wilkie (No-Shadow). If the "no-shadow" option is selected, shadow rays from the sun lamp will be disabled.