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Environments

OctaneRender™ currently supports Environment Maps / HDRIAn image which presents more than 8 bit per color channel unlike most common image formats. files, Sun / Sky environments and mesh emitters as lighting options.

Texture Environment

The Texture affects the color of the environment. User can link a texture node to set this color from any map, including an HDRI map.

• Power: The power of the entire environment can be adjusted using the Power parameter
• Rotation: If the environment is not in the correct rotation, it can be adjusted in real-time by using the Rotation parameter.
• Importance Sampling: Enables quicker convergence (noise reduction) for HRDI images by applying importance to certain areas of the HDRI so as to sample rays that resolve to the important areas more often than unimportant ar­eas. This means the ray tracing is more efficient as it is not wasting time on rays that do not contribute much to the overall image quality. Due to the added complexity this will reduce the Ms/sec of rendering, but each Ms will be more effective, therefore resulting in a higher im­age quality in less time. Importance sampling is enabled by default.

DayLight Environment

Octane has a powerful DayLight Environment node to simulate Sky and Sun lights. User can select how to set the Sun direction, using the geographic data or using the Sun angles.

• Longitude / Latitude: These parameters can be set to get realistic sun settings for the specified geographic location.
• Month / Day / GMT Offset / Hour: These parameters can be used to accurately place the sun in the sky according to the date / time for the sun at the current longitude / lati­tude
• Turbidity: The Turbidity can be used to adjust the sharpness of the sun lights 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 slider can be used to adjust the strength of the light. This can affect overall contrast and exposure level of the image.
• North Offset: The North offset slider can be used to adjust the actual North direc­tion of the scene. This is useful for Architecture Visualization to en­sure the direction of the sun is accurate to the scene.
• Model: This specifies which daylight model to be used as the current envi­ronment. The old daylight model lights a scene with spectral radi­ance assuming that the sun is moving over the horizon at a constant distance from the object. The new daylight model is used to simulate full spectrum daylight with the sun hovering at a varying distance from the tangent plane providing more sky color variation as the sun moves along and then bears shorter rays as the sun moves closer to the normal plane.
• Sky Color/Sunset Color: These settings are used by the new daylight model to customize the spectral shade of light. This can affect overall mood expressed by the image.
• Sun Size: This allows users to control the sun radius in the daylight environment.

OctaneRender™ enables the use of textures as sky backgrounds. Sun light with user defined texture as sky is provided by the Texture input pin in the Daylight node.

• Texture: This allows users to connect a texture that will be used as the background and ensures that objects in the scene accurately reflect it.
• Heading and Pitch rotations: This allow users to rotate and align the HDRI image
• Importance Sampling: This toggles the importance sampling of the sky texture – similar to the importance sampling in the texture environment.

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