Sky

The Sky shader is considered deprecated and will be removed in a future release. You should instead use the visibility options on the Skydome light instead.

 

This shader is intended to be used as a global environment shader (or a background shader in Arnold terms), thus affecting all objects in the scene. By default, it has a simple white color and will illuminate the whole scene evenly using this color. For image-based lighting, use the skydome light node instead.

See the Environment page for more information on creating and attaching Sky nodes.

 

It is recommended to use the Skydome Light for lighting scenes as this uses Multiple Importance Samping (MIS) to fire more rays towards bright, important areas of the environment map. This way, shadow details are preserved, while at the same time keeping noise levels low. There is no need to pre-blur the environment map used for diffuse/glossy rays as you normally would need to do when using the Sky shader. The only situation where using a sky shader may be faster than the Skydome light is when the environment texture is a constant color or has very low variance (see image below). See the Skydome page for reasons why using a Skydome light is more efficient.



Color

The color to be used as the environment. This could be mapped to an image probe.

Intensity

A multiplier for the color.

Format

How the environment/image will be interpreted. The type of map connected can be set to Mirrored Ball, Angular or Lat-long.

Cubic was deprecated in Arnold 4.1.4.0 and removed from HtoA 0.12.

Visibilty

Controls the Sky visibility to specific rays. To ensure the Sky isn't being used as a light, turn off Diffuse and Glossy visibility.

Opaque Alpha

The opacity settings of the sky shader, as seen in the camera viewport. Useful when scene geometry visibility is blocked by the sky node. 

XYZ Angle

X Angle

This provides an X orientation for the sky based on Euler angles.

Y Angle

This provides a Y orientation for the sky based on Euler angles.

Z Angle

This provides a Z orientation for the sky based on Euler angles.

 

Orientation

This can be used to link the XYZ axes against an object's orientation. Once picked, the rotation axes of an object is transformed, by a set of expression, into the corresponding axes set. This way, you can simply rotate the object to interactively adjust the sky orientation.

X Axis

Links the X-axis against an object's orientation.

Y Axis

Links the Y axis against an object's orientation.

Z Axis

Links the Z-axis against an object's orientation.

 

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