Skylight environment

Scene lit by a skylight environment

Description

The skylight environment simulates sun and the atmosphere lighting of the earth's surface. It is based on the work A Practical Analytic Model for Daylight - University of Utah. Sky polarization is modeled according to An Analytical Model for Skylight Polarisation, Wilkie et al.(2004)

The zenith direction (or normal to the horizon plane) may be set to any value in scene coordinates.

The sun position can be adjusted to any direction in the sky. The turbidity parameter controls the amount of scattering due to mist and dust. It can be set to any value between 2 and 6.

Children nodes

none

Parameters

Outdoor scene lit by a skylight emission shader environment

sunpos

vec3

The sun direction

turbidity

real

The turbidity, or haziness, of the atmosphere. Must be between 2 and 6

atmosphere

boolean

Disabling this removes the atmosphere, which simulates the sun viewed from space.

zenith

vec3

Zenith direction

Ocean XML 2.0 example

<?xml version="1.0" encoding="UTF-8"?>
<oceanroot version="2.0">
<environment type="skylight" name="skylight"/>
	<prm sunpos="0.839081 -0.427533 0.336392"/>
	<prm turbidity="2"/>
	<prm atmosphere="true"/>
	<prm zenith="0 0 1"/>
</environment>
</oceanroot>

See also

Environment types