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8.1 Iray attributes

 
Iray section of a transform node
 
Light Portal
Yes
Activates the selected area light as light portal. The area light emits no light.
 
No
Deactivates the selected area light as light portal. The area light emits light.
 
Use Inherited
Applies the settings of the Visibility attribute of the parent node.
 
Note:
 
Keep in mind that Portal Light only affects area lights. Light emissive geometry will not act as light portals. For details, see the section Area Light.
 
Visible
Use Inherited: Applies the settings of the Visibility attribute of the parent node.
 
Visible Yes: Enables the primary visibility of the object.
 
Visible No: Disables the primary visibility of the object. The object is still visible in reflections and refractions and cast shadow.
 
Movable
Use Inherited: Applies the settings of the attribute Movable of the parent node.
 
On: The selected object will be optimized for faster updates when moving the object while Iray is rendering. Using this flag excessivly can negatively impact rendering performance.
 
Off: The selected object is not optimized for fast updates.
 
Note:
 
The Movable attribute is supported by Iray Photoreal only.
 
Shadow Terminator Offset
Use Inherited: Applies the settings of the Shadow Terminator Offset attribute of the parent nod.
 
On: Iray uses an offset to eliminate self shadowing artifacts know as "Terminator effect" for the selected object.
 
Off: No offset will be applied to eliminate self shadowing artifacts.
 
Note:
Shadow Terminator Offset in the objects Attribute Editor only has an effect when Shadow Terminator Offset in the Render Settings is set to User.
 
Handle
Applies an identifier for the geometry. This identifier is required when using a Light Path Expression to access objects.
 
Object ID
Used to keep the object ID color of the object consistent during an animation.
 
 Use Inherited
Applies the parent nodes integer number as an object ID to the shape node.
 
Automatic
Applies a random integer number as an object ID to the shape node. The number is generated using the shape name.
 
Set
There are two ways to set the object ID color of the selected object:
 
Type a number to define a color or click on the color field to open the RGBA Color Chooser.
 
 Use the RGBA Color Chooser to select a color for RGB channels and the Alpha channel of object ID canvas.
 
Note:
Due to a bug in Maya on Windows OS the color field beside [Object ID ➤ Set] is getting dark grey after setting the color in the RGBA Color Chooser. You need to switch the Object ID attribute once and then go back to [Object ID ➤ Set] to see the correct color in the color field.