28 lines
2.1 KiB
Markdown
28 lines
2.1 KiB
Markdown
# Implement ray tracing with Shader Graph
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To use ray-traced effects with Shader Graph, use the **Raytracing Quality** Keyword node. This node exchanges accuracy for speed for ray-traced effects. It's also useful to prevent compilation error due to unsupported nodes when using [Path Tracing](Ray-Tracing-Path-Tracing.md).
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## Add the Raytracing Quality Keyword node
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The Raytracing Quality Keyword node is a [Built-in Keyword node ](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?subfolder=/manual/Keywords.html#built-in-keywords).
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To add the Raytracing Quality Keyword node to the graph:
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1. In the [Blackboard](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?subfolder=/manual/Blackboard.html), click plus (**+**).
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2. Go to **Keyword** > **Raytracing Quality**. This creates the keyword and makes it visible on the Blackboard.
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## Use the Raytracing Quality keyword node
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To use this keyword in the graph, you need to create a [Keyword Node](https://docs.unity3d.com/Packages/com.unity.shadergraph@latest/index.html?subfolder=/manual/Keyword-Node.html). To do this, drag the **Raytracing Quality** Keyword node from the Blackboard to the graph or open the Create Node Menu and search for **Raytracing Quality** .
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### Available Ports
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| Name | Direction | Type | Description |
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| :------------ | :-------- | :------------- | :----------------------------------------------------------- |
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| **default** | Input | Vector4 | The value to use for the normal Shader Graph. This is the default path Unity uses to render this Shader Graph. |
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| **raytraced** | Input | Vector4 | The value to use for the fast Shader Graph to use with the ray-traced effects.|
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| **pathtraced** | Input | Vector4 | The value to use for the Shader Graph when the path tracer is enabled. This is useful to prevent compilation error due to unsupported nodes in path tracing.|
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| **output** | Output | Vector4 | Outputs is the value which will be selected based on the context this shader graph is used. |
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