Help needed

[UserUser510]

kMotion doesn't work, even after applying @EsiNikko's hotfixes, and I keep getting these warning logs:

CommandBuffer: temporary render texture _CameraColorTexture not found while executing Motion Blur (Blit source)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

and

CommandBuffer: temporary render texture _CameraColorTexture not found while executing Motion Blur (Blit destination)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

Is there a way to fix this issue? (2021.3.6f1)

[caogtaa]

I‘m using 2021.3.6f1 and also applied @EsiNikko's hotfixes.
Try following steps:

1. In MotionBlurRenderPass.cs

   // comment out this line, and use next line
   // var colorTextureIdentifier = new RenderTargetIdentifier("_CameraColorTexture");
   var colorTextureIdentifier = renderingData.cameraData.renderer.cameraColorTarget;
   

2. Note Unity 2021.3.6f1 already include source code of kMotion, with same shader name but slightly different implementation (What a surprise!). So Shader.Find() may result finding the wrong version of kMotion shader.
   
   Change shader name in 1st line of CameraMotionVectors.shader and ObjectMotionVectors.shader.
   Then In MotionVectorRenderPass.cs, change these lines:

   const string kCameraShader = "Hidden/kMotion/CameraMotionVectors";   // use new shader name
   const string kObjectShader = "Hidden/kMotion/ObjectMotionVectors";   // use new shader name
   

3. In ObjectMotionVectors.shader, comment out following lines once you see redefinition warning in Editor log.

   float4x4 unity_MatrixPreviousM;
   float4 unity_MotionVectorsParams;
   

[maxsamarin]

@caogtaa You are a savior! By downloading @EsiNikko 's version (link) and following all your steps, I got object-based motion blur working with Unity 2022.1.20f1 and URP 13.1.8 🙏

[UserUser510]

I‘m using 2021.3.6f1 and also applied @EsiNikko's hotfixes. Try following steps:

1. In MotionBlurRenderPass.cs

   // comment out this line, and use next line
   // var colorTextureIdentifier = new RenderTargetIdentifier("_CameraColorTexture");
   var colorTextureIdentifier = renderingData.cameraData.renderer.cameraColorTarget;
   

2. Note Unity 2021.3.6f1 already include source code of kMotion, with same shader name but slightly different implementation (What a surprise!). So Shader.Find() may result finding the wrong version of kMotion shader.
   Change shader name in 1st line of CameraMotionVectors.shader and ObjectMotionVectors.shader.
   Then In MotionVectorRenderPass.cs, change these lines:

   const string kCameraShader = "Hidden/kMotion/CameraMotionVectors";   // use new shader name
   const string kObjectShader = "Hidden/kMotion/ObjectMotionVectors";   // use new shader name
   

3. In ObjectMotionVectors.shader, comment out following lines once you see redefinition warning in Editor log.

   float4x4 unity_MatrixPreviousM;
   float4 unity_MotionVectorsParams;
   

thanks