---
title: "PxrShadowDisplayFilter"
canonical: "https://rmanwiki-25.pixar.com/space/REN25/20415740/PxrShadowDisplayFilter"
format: markdown
---
*PxrShadowDisplayFilter* is used to generate a normalized shadow output. It can be used in conjunction with the [holdout](https://renderman.atlassian.net/wiki/spaces/REN25/pages/20416466) workflow to composite 3D elements onto 2D plates*.* It takes both an occluded and unoccluded display channel as input and writes its output to a shadow channel.

```
DisplayChannel "color shadow"
DisplayChannel "color occluded" "string source" ["color lpe:C[DS]+[LO]"]
DisplayChannel "color unoccluded" "string source" ["color lpe:unoccluded;C[DS]+[LO]"]
```

### Parameters

#### Occluded AOV

The name of the input occluded AOV used to calculate the shadow output, e.g.

![PxrChecker_occludedAov.png](media://f5f41625-2d48-4233-9511-11ecfb518a10)


#### Unoccluded AOV

The name of the input unoccluded AOV used to calculate the shadow output, e.g.

![PxrChecker_unoccludedAov.png](media://b72e29b7-fade-4b13-ac55-16f5ae4beb39)


#### Shadow AOV

The name of the output shadow AOV to write to. The shadow AOV is added to the alpha when "a" is specified.

![PxrChecker_shadowAov.png](media://9650f6cc-c705-47e0-a479-f96bef122d20)