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6.8.1 Color canvases attributes

 
Render Settings Output tab when Iray Photoreal is selected
 
Mode
Iray can render up to twenty color canvases in a single rendering process. There are the two different modes "Radiance" and "Irradiance" to control the type of rendered images of all of the twenty color canvases.
 
Mode Radiance
Using this mode the radiance scattered from the seen objects onto the camera sensor is collected in the color canvases. This is the usual mode.
 
Mode Irradiance
Contrary to the Mode Radiance, this mode collects the incoming light at the seen objects.
 
Mode Radiance exposes the Matte Shadow Affects Alpha attribute
 
Matte Shadow Affects Alpha
Use this attribute to define if shadows will be shown in the alpha mask of active matte objects.
 
Note:
 
This attribute is only visible when Mode Radiance is selected.
 
GUI to select the different canvas types
 
Type
For each color canvas exists a separate section to configure it:
 
Type Disabled
This canvas is disabled, i.e. no image is written.
 
Type All
   A framebuffer that contains the so-called beauty pass (emission, diffuse, glossy, and specular).
 
For Mode Radiance there are already the following predefined types:
 
Type Diffuse
A framebuffer that contains the diffuse contribution, i.e. "L.*DE". The last event on the light path before the eye was a diffuse event.
 
Type Glossy
 A framebuffer that contains the glossy contribution, i.e. "L.*GE". The last event on the light path before the eye was a glossy event.
 
Type Specular
A framebuffer that contains the specular contribution, i.e. "L.*SE". The last event on the light path before the eye was a specular event.
 
Type Emission
A framebuffer that contains the emission contribution, i.e. "LE", from directly visible light sources and emitting surfaces.
 
Type Environment
A framebuffer that shows only the emission from the environment light, i.e. "LeE".
 
Alpha
This attributes allows to toggle whether an alpha channel for the predefined framebuffer should be rendered or not. The content of the written alpha channel varies between the pre-defined LPE Diffuse, Glossy, Specular, Emission and Environment.
 
Type Light Pass Expression
A framebuffer that contains the contribution if all light paths defined by the LPE attribute.
 
Alpha LPE
A framebuffer that contains objects contribute to the Alpha channel defined by the LPE attribute.
 
Note:
 
If Light Path Expression is chosen only an alpha channel will be written until a valid Light Path Expression for Alpha LPE exists.