Planar Reflection Probe

The Planar Reflection Probe component is one of the types of Reflection Probe that the High Definition Render Pipeline (HDRP) provides to help you create reactive and accurate reflective Materials.

Properties

Planar Reflection Probes share many properties with the the built-in render pipeline Reflection Probe, and the HDRP cubemap Reflection Probe.

General Properties

Property Description

Realtime Mode A Planar Reflection Probe updates in real time. Use this property to tell HDRP how often to update the Probe.
Every Frame updates the Probe’s capture data every frame.
On Enable updates the Probe’s capture data each time Unity calls the component’s OnEnable() function. This occurs whenever you enable the component in the Inspector or activate the GameObject that the component attaches to.

Property	Description
Realtime Mode	A Planar Reflection Probe updates in real time. Use this property to tell HDRP how often to update the Probe. Every Frame updates the Probe’s capture data every frame. On Enable updates the Probe’s capture data each time Unity calls the component’s `OnEnable()` function. This occurs whenever you enable the component in the Inspector or activate the GameObject that the component attaches to.

Projection Settings

The following properties control the projection settings for this Planar Reflection Probe.

Property	Description
Proxy Volume	The Reflection Proxy Volume this Probe uses to correct displacement issues between the Probe’s capture point (Mirror Position) and the position of the reflective Material using the RenderTexture this Probe captures. Note: The Proxy Volume you assign must be the same Shape as the Influence Volume.
Use Influence Volume As Proxy Volume	Tick this checkbox to use the boundaries of the Influence Volume as the Proxy Volume. This property only appears when you have not set a Reflection Proxy Volume to the Proxy Volume property.

Influence Volume

The Influence Volume defines the area around the Probe in which reflective Materials use the results that the Probe captures to influence the reflective behavior of their surface. The Planar Reflection Probe also uses the bounds of the Influence Volume to calculate Field Of View if you don’t provide an override value.

There are two workflows you can use to edit your Planar Reflection Probe’s Influence Volume: Normal mode and Advanced mode. The two buttons in the top right of the Influence Volume section allow you to select which mode to use.

Normal mode allows you to set a single value for the Blend Distance. You can use Normal mode with Box and Sphere Influence Volumes.
Advanced mode allows you to define the Blend Distance on a per axis, per direction basis for an Influence Volume with a Box Shape.

Property	Description
Shape	Defines the shape of the Influence Volume. The possible values are Box and Sphere. Selecting Sphere disables Advanced mode because you can only use Advanced mode for Box Influence Volumes.
Box Size	Defines the scale of each axis of the box that represents the Influence Volume. Only available with a Box Shape.
Radius	Defines the radius of the sphere that represents the Influence Volume. Only available with a Sphere Shape.
Blend Distance	The inward distance from the Box Size or Radius at which this Planar Reflection Probe blends with other Reflection Probes. In Normal mode, this property is a single value that modulates the distance at which this Reflection Probe blends with other Reflection Probes in every direction. This mode is available for Box or Sphere Influence Volumes.In Advanced mode, this property uses six values, one for each side of the box. Use each of the six input fields to define the blend distance in each direction. For example, Y defines the blending distance for the face at the top of the box and -Y defines the blending distance for the face on the bottom. This mode is only available for Box Influence Volumes.This feature is only available for deferred Reflection Probes.

Capture Settings

The following properties control the method that the Planar Reflection Probe uses to capture the directional view of its surroundings.

Property	Description
Mirror Position	Offsets the position of the mirror from the Transform Position.
Mirror Rotation	Offsets the rotation of the mirror from the Transform Rotation.
Clear Mode	Defines how to fill empty background areas of the RenderTexture this Probe captures. • Sky uses the sky defined by the current Volume settings to fill empty background areas. • Background uses the Background Color setting to fill empty background areas. • None reuses the previous value for each pixel that doesn’t represent a reflected GameObject, instead of filling in empty areas of the RenderTexture.
Background Color	The color to fill empty background areas of the RenderTexture if you set the Clear Mode to Background.
Clear Depth	Choose whether the Planar Reflection Probe clears the Depth Buffer or not.
Volume Layer Mask	A LayerMask that defines which Volumes affect this Planar Reflection Probe’s capture.
Volume Anchor Override	Set the Transform that the Volume system uses to handle the position of this Planar Reflection Probe. For example, if you want this Planar Reflection Probe to match post-processing effects with the view Camera, set this property to the view Camera’s Transform. The Volume system then uses the Camera’s position to process which Volume affects this Planar Reflection Probe.
Use Occlusion Culling	Enables Occlusion Culling for this Planar Reflection Probe.
Culling Mask	A LayerMask that defines which Layers to include in the reflection. GameObjects on the Layers included in this LayerMask appear in the reflection.
Field Of View	The field of view of the capture Camera. Planar Reflection Probes normally calculate the capture Camera’s field of view (FoV) using the Mirror Position and the bounds of the Influence Volume. Enable this property to override the capture Camera’s FoV with the value you set here.
Clip Planes - Near	The closest point relative to the Planar Reflection Probe that the Probe captures reflections.
Clip Planes - Far	The furthest point relative to the Planar Reflection Probe that it captures reflections.
Probe Layer Mask	Acts as a culling mask for environment lights (light from other Planar Reflection Probes and Reflection Probes). This Planar Reflection Probe ignores all Reflection Probes that are on Layers not included in this Layer mask, so use this property to ignore certain Reflection Probes when rendering this one.
Custom Frame Settings	Allows you to define custom Frame Settings for this Probe. Disable this property to use the Default Frame Settings in your Unity Project’s HDRP Asset.

Custom Settings

The following properties control extra behavior options for fine-tuning the behavior of your Planar Reflection Probes.

Property	Description
Light Layer	A mask that allows you to choose which Light Layers this Reflection Probe affects. This Reflection Probe only affects Mesh Renderers with a matching Rendering Layer Mask. Navigate to your Project’s HDRP Asset > Render Pipeline Supported Features and enable Light Layers to use this property.
Multiplier	A multiplier that HDRP applies to the RenderTexture captured by the Planar Reflection Probe. Higher multiplier values make the queried RenderTexture brighter, and lower multiplier values make the queried RenderTexture darker.
Weight	The overall weight of this Reflection Probe’s contribution to the reflective effect of Materials. When Reflection Probe’s blend together, the weight of each Probe determines their contribution to a reflective Material in the blend area.

Gizmos

You can use Scene view gizmos to visually customize specific properties.

Gizmo	Property	Description
	Influence Volume bounds boundary	Provides Scene view handles that allow you to move the boundaries of the Influence Volume, which defines the area this Reflection Probe affects reflective Materials. Edits the Box Size or Radius value, depending on the Shape you select.
	Blend Distance boundary	Provides Scene view handles that allows you to alter the inward distance from the Box Size or Radius at which this Planar Reflection Probe blends with other Reflection Probes. Its behavior depends on the workflow mode you are using. It scales all sides equally in Normal mode, scales just the side with the handle you control in Advanced mode.
	Mirror Position	Changes the behavior of the Move Tool so that it alters the Mirror Position property, rather than the Position of the Transform.
	Mirror Rotation	Changes the behavior of the Rotate Tool so that it alters the Mirror Rotation property, rather than the Rotation of the Transform.