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title: "Dirt"
canonical: "https://documentation.chaos.com/space/VREVIT/160891185/Dirt"
format: markdown
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### **Example: Inner Occlusion**

It allows the user to invert the effect with respect to surface normals - e.g. instead of crevices, open corners are shaded with the occluded color.



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### **Example: Radius**

This parameter determines the amount of area (in units) where the Dirt effect is produced. The Dirt color has been tinted red to clarify the effect. The scene used for these examples is a small paper 1/100th scale-model of the architecture.



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### **Example: Falloff**



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### **Example: Distribution**

The Distribution parameter forces the rays to gather closer. The effect is that the dirt area is being narrowed closer to the contact edges.




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### **Example: Streaks Ambient**

The** Streaks Ambient** parameter is enabled and the **Mode **is set to **Ambient Occlusion**. Depending on the values of** Bias X** and **Bias Y**, the streaks change. In the first render, the **Bias X** is set to *0* and the **Bias Y** is set to *-15*. In the second render, the **Bias X** is set to *0* and the **Bias** **Y** is set to *-7*. In the third image, the **Bias X** gets a value of 10 and the** Bias Y** is set to -7. The** Bias Z **has a value of* 30* for both renders.



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### **Example: Streaks Size**

The **Streaks Ambient** parameter is enabled and the **Mode **is set to **Ambient Оcclusion**. The **Streaks Size** controls the thickness of all streaks:



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### **Example: Bias**

This parameter biases the normals so that the dirt effect is forced to some of the axis(es).