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Octane Daylight

The Daylight Environment system simulates an outdoor lighting setup using real-world parameters. It can be accessed in the OctaneRender panel under the Environment rollout (figure 1).

Figure 1: Accessing the Octane Daylight parameters in the OctaneRender panel.

Daylight Environment Parameters

Sun Direction

Determines the location of the sun in the sky.

Sky Turbidity

The Turbidity can be used to adjust the sharpness of the sun light's shadows. A low value creates sharp shadows (like on a sunny day) and a higher value diffuses the shadows similarly to a cloudy day.

Power

The Power parameter can be used to adjust the strength of the light. This can affect overall contrast and exposure level of the image.

Sun Intensity

Determines only the intensity of the sun (directional light source) but does not affect the overall sky intensity.

North Offset

The North offset slider can be used to adjust the North direction of the scene. This is useful for Architecture Visualization to ensure the direction of the sun is accurate to the scene.

Daylight Model - Specifies the daylight model to use as the current environment.

• Octane Daylight - This is the new default daylight model simulates full-spectrum daylight, providing more sky color variation as the sun moves along and bearing shorter rays as the sun moves closer to the normal plane.
• Preetham Daylight - This is the old daylight model that lights a scene with basic spectral radiance as the sun moves over the horizon at a relative distance from the object.
• Nishita Daylight - Implements atmospheric scattering based on the Nishita sky model and displays the color variations, which are optical effects caused by the particles in the atmosphere.
• Hosek Wilkie Daylight - Produces more realistic and detailed results than other implementations specially in hazy conditions and near the horizon.

Sky Color/Sunset Color

These settings are used by the new daylight model to customize the spectral shade of light. This can affect the overall mood of the scene.

Sun Size

This allows users to control the sun radius in the daylight environment.

Ground Color

Base color of the ground which is an infinite plane that is only visible in the final rendering. It serves to produce a horizon line for the Daylight system. This allows the user to control the color of the infinite ground plane associated with the Sun Sky systems.

Ground Start Angle

The angle (in degrees) below the horizon where the transition to the ground color starts.

Ground Blend Angle

The angle over which the sky color transitions to the ground color.

Sky Texture

Connects a texture to use as the background, and ensures that objects in the scene accurately reflect it.

Importance Sampling

This toggles the Sky texture's importance sampling, similar to the Texture environment's importance sampling.

Medium

This parameter accepts an AbsorptionDefines how fast light is absorbed while passing through a medium., ScatteringDefines how fast light gets scattered when traveling through the medium., or Volume medium node to create volume/fog effects across the scene.

Medium Radius

Adjusts the medium's scale.

Backplate

This makes the Visible environment behave as a background plate.

Reflections

Makes the Visible environment visible in material reflections.

Refractions

Makes the Visible environment visible in the material refractions.

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