forked from BilalY/Rasagar
74 lines
4.2 KiB
Markdown
74 lines
4.2 KiB
Markdown
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---
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uid: urp-forward-plus-rendering-path
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---
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# Forward+ Rendering Path
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The Forward+ Rendering Path lets you avoid the per object limit of the Forward Rendering Path.
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The Forward+ Rendering Path has the following advantages compared with the Forward Rendering Path:
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* There is no per-object limit for the number of Lights that affect GameObjects, the [per-Camera limit still applies](../urp-universal-renderer.md#per-camera-limit).<br/>This implementation lets you avoid splitting big meshes when more than 8 lights affect them.
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* Blending of more than 2 reflection probes.
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* Support for multiple Lights when using Unity Entity Component System (ECS).
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* More flexibility with procedural draws.
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For more information, also check: [Rendering Path comparison](../urp-universal-renderer.md#rendering-path-comparison).
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## <a name="how-to-enable"></a>How to select the Forward+ Rendering Path
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To select the Forward+ Rendering Path, use the property **Rendering** > **Rendering Path** in the URP Universal Renderer asset.
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When you set the Rendering Path to Forward+, Unity ignores the values in the following properties in URP Asset, **Lighting** section:
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* **Main Light**. With Forward+ the value of this property is **Per Pixel** regardless of the value you select.
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* **Additional Lights**. With Forward+ the value of this property is **Per Pixel** regardless of the value you select.
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* **Additional Lights** > **Per Object Limit**. Unity ignores this property.
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* **Reflection Probes** > **Probe Blending**. Reflection probe blending is always on.
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## Limitations
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The Forward+ Rendering Path has no limitations compared with the Forward Rendering Path.
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## Reduce build time
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Due to the wide variety of use cases, target platforms, renderers, and features used in projects, certain URP configurations can result in a large number of shader variants. That can lead to long compilation times.
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Long shader compilation time affects both player build time and the time for a scene to render in the Editor.
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The per-camera visible light limit value affects the compilation time for each **Lit** and **Complex Lit** shader variant. In the Forward+ Rendering Path, on desktop platforms, that limit is 256.
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This section describes how to reduce the shader compilation time by changing the default maximum per-camera visible light count.
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### Change the maximum number of visible lights
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> [!NOTE]
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> This instruction describes a workaround for a limitation in the URP design. This limitation will be mitigated in one of the future Unity versions.
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The [Universal Render Pipeline Config package](../URP-Config-Package.md) contains the settings that define the number of maximum visible light. The following instructions describe how to change those settings.
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> [!NOTE]
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> If you upgrade the Unity version of your project, repeat this procedure.
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1. In your project folder, copy the **URP Config Package** folder from `/Library/PackageCache/com.unity.render-pipelines.universal-config` to `/Packages/com.unity.render-pipelines.universal-config`.
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2. Open the file `/com.unity.render-pipelines.universal-config/Runtime/ShaderConfig.cs.hlsl`.
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The file contains multiple definitions that start with `MAX_VISIBLE_LIGHT_COUNT` and end with the target platform name. Change the value in brackets to a suitable maximum in-frustum per-camera light count for your project, for example, `MAX_VISIBLE_LIGHT_COUNT_DESKTOP (32)`.
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For the **Forward+** Rendering Path, the value includes the Main Light. For the **Forward** Rendering Path, the value does not include the Main Light.
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3. Open the file `/com.unity.render-pipelines.universal-config/Runtime/ShaderConfig.cs`.
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The file contains multiple definitions that start with `k_MaxVisibleLightCount` and end with the platform name. Change the value so that it matches the value set in the `ShaderConfig.cs.hlsl` file, for example `k_MaxVisibleLightCountDesktop = 32;`.
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4. Save the edited files and restart the Unity Editor. Unity automatically configures your project and shaders to use the new configuration.
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Now the Player build time should be shorter due to the reduced compilation time for each shader variant.
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