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urp-urp-universal-renderer

Universal Renderer

This page describes the URP Universal Renderer settings.

For more information on rendering in URP, also check Rendering in the Universal Render Pipeline.

Rendering Paths

The URP Universal Renderer implements the following Rendering Paths:

Rendering Path comparison

This section shows the differences between the Rendering Paths in URP.

Feature Forward Forward+ Deferred
Maximum number of real-time lights per object. 9 (1 Main Light, and 8 Additional Lights) Unlimited. The per-Camera limit applies. Unlimited. The per-Camera limit applies.
Transparent objects are rendered using the Forward pass, where the maximum number of real-time lights is 9 (1 Main Light, and 8 Additional Lights).
Per-pixel normal encoding No encoding (accurate normal values). No encoding (accurate normal values). Two options:
  • Quantization of normals in G-buffer (loss of accuracy, better performance).
  • Octahedron encoding (accurate normals, might have significant performance impact on mobile GPUs).
For more information, refer to Encoding of normals in G-buffer.
MSAA Yes Yes No
Vertex lighting Yes No No
Camera stacking Yes Yes Supported with a limitation: Unity renders only the base Camera using the Deferred Rendering Path. Unity renders all overlay Cameras using the Forward Rendering Path.

Per-camera visible real-time light limit

There are per-camera limits on the number of visible lights in all rendering paths.

The Main Light always counts as visible.

The per-camera limits for different Rendering Paths and platforms are:

Forward and Deferred Rendering Paths:

  • Desktop and console platforms: 1 Main Light, and 256 Additional Lights.

  • Mobile platforms: 1 Main Light, and 32 Additional Lights.
    OpenGL ES 3.0 and earlier: 1 Main Light, and 16 Additional Lights.

Forward+ Rendering Path:

The Forward+ Rendering Path treats all lights (the Main Light and Additional Lights) the same way, which is why the per-camera limits are one light less than in the Forward and Deferred Rendering Paths.

  • Desktop and console platforms: 256 lights (including the Main Light).

  • Mobile platforms: 32 lights (including the Main Light).
    OpenGL ES 3.0 and earlier: 16 lights (including the Main Light).

How to find the Universal Renderer asset

To find the Universal Renderer asset that a URP asset is using:

  1. Select a URP asset.

  2. In the Renderer List section, click a renderer item or the vertical ellipsis icon (⋮) next to a renderer.

    How to find the Universal Renderer asset

Universal Renderer asset reference

This section describes the properties of the Universal Renderer asset.

Filtering

This section contains properties that define which layers the renderer draws.

Property Description
Opaque Layer Mask Select which opaque layers this Renderer draws
Transparent Layer Mask Select which transparent layers this Renderer draws

Rendering

This section contains properties related to rendering.

Property Description
Rendering Path Select the Rendering Path.
Options:
  Depth Priming Mode This property determines when Unity performs depth priming.
Depth Priming can improve GPU frame timings by reducing the number of pixel shader executions. The performance improvement depends on the amount of overlapping pixels in the opaque pass and the complexity of the pixel shaders that Unity can skip by using depth priming.
The feature has an upfront memory and performance cost. The feature uses a depth prepass to determine which pixel shader invocations Unity can skip, and the feature adds the depth prepass if it's not available yet.
The options are:
  • Disabled: Unity does not perform depth priming.
  • Auto: If there is a Render Pass that requires a depth prepass, Unity performs the depth prepass and depth priming.
  • Forced: Unity always performs depth priming. To do this, Unity also performs a depth prepass for every render pass. Note: Depth priming is disabled at runtime on certain hardware (Tile Based Deferred Rendering) regardless of this setting.
On Android, iOS, and Apple TV, Unity performs depth priming only in the Forced mode. On tiled GPUs, which are common to those platforms, depth priming might reduce performance when combined with MSAA.

This property is available only if Rendering Path is set to Forward
  Accurate G-buffer normals Indicates whether to use a more resource-intensive normal encoding/decoding method to improve visual quality.

This property is available only if Rendering Path is set to Deferred.
Depth Texture Mode Specifies the stage in the render pipeline at which to copy the scene depth to a depth texture. The options are:
  • After Opaques: URP copies the scene depth after the opaques render pass.
  • After Transparents: URP copies the scene depth after the transparents render pass.
  • Force Prepass: URP does a depth prepass to generate the scene depth texture.
Note: On mobile devices, the After Transparents option can lead to a significant improvement in memory bandwidth. This is because the Copy Depth pass causes a switch in render target between the Opaque pass and the Transparents pass. When this occurs, Unity stores the contents of the Color Buffer in the main memory, and then loads it again once the Copy Depth pass is complete. The impact increases significantly when MSAA is enabled as Unity must also store and load the MSAA data alongside the Color Buffer.

Native RenderPass

This section contains properties related to URP's Native RenderPass API.

Property Description
Native RenderPass Indicates whether to use URP's Native RenderPass API. When enabled, URP uses this API to structure render passes. As a result, you can use programmable blending in custom URP shaders. For more information about the RenderPass API, refer to ScriptableRenderContext.BeginRenderPass.

Note: Enabling this property has no effect on OpenGL ES.

Shadows

This section contains properties related to rendering shadows.

Property Description
Transparent Receive Shadows When this option is on, Unity draws shadows on transparent objects.

Overrides

This section contains Render Pipeline properties that this Renderer overrides.

Stencil

With this check box selected, the Renderer processes the Stencil buffer values.

URP Universal Renderer Stencil override

For more information on how Unity works with the Stencil buffer, refer to ShaderLab: Stencil.

In URP, you can use bits 0 to 3 of the stencil buffer for custom rendering effects. This means you can use stencil indices 0 to 15.

Compatibility

This section contains settings related to backwards compatibility.

Property Description
Intermediate Texture This property lets you force URP to renders via an intermediate texture.
Options:
  • Auto: URP uses the information provided by the ScriptableRenderPass.ConfigureInput method to determine automatically whether rendering via an intermediate texture is necessary.
  • Always: forces rendering via an intermediate texture. Use this option only for compatibility with Renderer Features that do not declare their inputs with ScriptableRenderPass.ConfigureInput. Using this option might have a significant performance impact on some platforms.

Renderer Features

This section contains the list of Renderer Features assigned to the selected Renderer.

For information on how to add a Renderer Feature, check How to add a Renderer Feature to a Renderer.

URP contains the pre-built Renderer Feature called Render Objects.