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(DomeLight_1)=

DomeLight_1

An intrinsic light that emits light inwards from a very distant external environment, such as a sky, or a light environment captured in a High Dynamic Range (HDR) image used for Image Based Lighting (IBL).

Use DomeLights to simulate environment lighting.

For DomeLight_1, the dome's default orientation is determined by its poleAxis property. The fallback value, "scene", means that the dome starts with its top pole aligned with the stage's up axis.

Note that the rotation necessary to align the dome light with its poleAxis is intended to be applied by a renderer to only the dome itself, and not to inherit down to any USD namespace children of the dome light prim.

If poleAxis is set to "Y" or "scene" and the stage's up axis is "Y", the dome's default orientation will adhere to the OpenEXR specification for latitude-longitude maps. From the OpenEXR documentation:

Latitude-Longitude Map:

The environment is projected onto the image using polar coordinates (latitude and longitude). A pixel's x coordinate corresponds to its longitude, and the y coordinate corresponds to its latitude. Pixel (dataWindow.min.x, dataWindow.min.y) has latitude +pi/2 and longitude +pi; pixel (dataWindow.max.x, dataWindow.max.y) has latitude -pi/2 and longitude -pi.

In 3D space, latitudes -pi/2 and +pi/2 correspond to the negative and positive y direction. Latitude 0, longitude 0 points into positive z direction; and latitude 0, longitude pi/2 points into positive x direction.

The size of the data window should be 2*N by N pixels (width by height), where N can be any integer greater than 0.

See also the alternative {ref}DomeLight version.

:depth: 2
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:backlinks: none

(DomeLight_1_properties)=

Properties

(DomeLight_1_guideRadius)=

guideRadius

USD type: float

Fallback value: 100000.0

Sets the radius of guide geometry used to visualize the dome light, in USD units. The fallback value is 1.0e5, which equates to 1 km for scenes whose metersPerUnit is the USD default of 0.01 (1 unit equals 1 cm).

(DomeLight_1_inputs:texture:file)=

inputs:texture:file

USD type: asset

The color texture (typically an HDR image intended for IBL) used by the DomeLight.

(DomeLight_1_inputs:texture:format)=

inputs:texture:format

USD type: token

Fallback value: automatic

The parameterization of the color texture. Valid values are:

• automatic: The renderer will try to determine the layout from the file itself. For example, RenderMan texture files embed an explicit parameterization.
• latlong: The file will be parameterized with latitude as X, longitude as Y.
• mirroredBall: The file will be parameterized as an image of the environment reflected in a sphere, using an implicitly orthogonal projection.
• angular: Similar to mirroredBall but the radial dimension is mapped linearly to the angle, providing better sampling at the edges.
• cubeMapVerticalCross: The file will be parameterized as a cube map with faces laid out as a vertical cross.

(DomeLight_1_light:shaderId)=

light:shaderId

USD type: token

Fallback value: DomeLight

The shader ID for a DomeLight_1. USD will also register a Sdr shader node with a "DomeLight" identifier and the source type "USD" to correspond to the light's inputs

(DomeLight_1_poleAxis)=

poleAxis

USD type: token

Fallback value: scene

The starting alignment of the dome's top pole. This alignment is for the dome itself and is not inherited by the namespace children of the dome. Valid values are:

• scene: The dome light's top pole is aligned with the stage's up axis.
• Y: The dome light's top pole is aligned with the +Y axis.
• Z: The dome light's top pole is aligned with the +Z axis.

If poleAxis is set to "Y" or "scene" and the stage's up axis is "Y", the dome's default orientation will adhere to the OpenEXR specification for latitude-longitude maps.

(DomeLight_1_portals)=

portals

USD type: rel (relationship)

Optional portals to guide light sampling.

(DomeLight_1_inheritedproperties_Xformable)=

Inherited Properties ({ref}Xformable)

(DomeLight_1_xformOpOrder)=

xformOpOrder

USD type: token[]

(DomeLight_1_inheritedproperties_Imageable)=

Inherited Properties ({ref}Imageable)

(DomeLight_1_proxyPrim)=

proxyPrim

USD type: rel (relationship)

(DomeLight_1_purpose)=

purpose

USD type: token

Fallback value: default

(DomeLight_1_visibility)=

visibility

USD type: token

Fallback value: inherited