Restrict a render pass to a scene area in URP

1. Update your shader code to enable or disable your custom rendering effect based on a Boolean value.
   For example, add the following code to your shader:

   Pass{    ...    // Add a variable to enable or disable your custom rendering effect    float _Enabled;    ...    float4 Frag(Varyings input) : SV_Target0    {        ...        // Return the color with the effect if the variable is 1, or the original color if the variable is 0        if (_Enabled == 1){            return colorWithEffect;        } else {            return originalColor;        }    }}

2. Create a script that implements the

   VolumeComponent

   class. This creates a volume override component that you can add to a volume.

   using UnityEngine;using UnityEngine.Rendering;public class MyVolumeOverride : VolumeComponent{}

3. In the Hierarchy window, select the Add (+) button, then select

   GameObject

   ?

   > Volume > Box Volume.
4. In the

   Inspector

   ?

   window for the new box volume, under Volume, select New to create a new volume profile.
5. Select Add override, then select your volume override component, for example My Volume Override.
6. Add a property to the volume override script. Unity adds the property in the Inspector window of the volume override.
   For example:

   public class MyVolumeOverride : VolumeComponent{    // Add an 'Effect Enabled' checkbox to the Volume Override, with a default value of true.    public BoolParameter effectEnabled = new BoolParameter(true);}

7. In your custom pass, use the

   GetComponent

   API to get the volume override component and check the value of the property.
   For example:

   class myCustomPass : ScriptableRenderPass{    ...    public void Setup(Material material)    {        // Get the volume override component        MyVolumeOverride myOverride = VolumeManager.instance.stack.GetComponent<MyVolumeOverride>();        // Get the value of the 'Effect Enabled' property        bool effectStatus = myOverride.effectEnabled.overrideState ? myOverride.effectEnabled.value : false;    }}

8. Pass the value of the property to the variable you added to the shader code.
   For example:

   class myCustomPass : ScriptableRenderPass{    ...    public void Setup(Material material)    {        MyVolumeOverride myOverride = VolumeManager.instance.stack.GetComponent<MyVolumeOverride>();        bool effectStatus = myOverride.effectEnabled.overrideState ? myOverride.effectEnabled.value : false;        // Pass the value to the shader        material.SetFloat("_Enabled", effectStatus ? 1 : 0);    }}

Additional resources

• Volumes in URP
• Writing custom shaders in URP
• Create a custom post-processing effect with Volume support in URP