Question Enabling Motion Vector Pass For DrawProcedural?

typo... unity_MatrixPreviousMI

 

Does the shader require anything specific to work in HDRP? Trying to render a simple mesh via Graphics.RenderPrimitives with motion vectors, and while the mesh shows up correctly, the motion vector debugger shows no motion vectors data. The shader and code use to render is from the Unity documentation for the RenderPrimitives function

 

Why does MotionVectorGenerationMode have the modes ForceNoMotion, Camera and Object, but not Geometry?

I can't get Graphics.RenderMeshIndirect to render motion vectors in Object mode. When I try to set unity_ObjectToWorld I get the undeclared identifyer error "Use_Macro_UNITY_MATRIX_M_instead_of_unity_ObjectToWorld".

Are anyone else seeing that error?

 

try:

Code (CSharp):

1. #ifdef unity_ObjectToWorld
2.         #undef unity_ObjectToWorld
3.     #endif
4.     #ifdef unity_WorldToObject
5.         #undef unity_WorldToObject
6.     #endif
7.  
8. //    Due to motion vectors!
9.     #ifdef unity_MatrixPreviousM
10.          #undef unity_MatrixPreviousM
11.     #endif
12.     #ifdef unity_MatrixPreviousMI
13.         #undef unity_MatrixPreviousMI
14.     #endif

 

Thank you. Brilliant! I had no idea you could undefine.

 

@larsbertram1 unfortunately I am still not getting anything in the motion vector debug view. MotionVectorGenerationMode is set to Object and I've tried to toggle on and off MotionVectorForVertexAnimation and AddPreComputedVelocity on the material as well as AddCustomVelocity in the ShaderGraph. The instanced objects are rendering fine, just without motion vectors. I wonder what I am missing.

EDIT: I am of cause also setting unity_MatrixPreviousM and unity_MatrixPreviousMI in VertInstancingSetup in the CustomFunctionNode.

 

@cecarlsen

Do you have Depth Prepass enabled in the HDRP global settings / camera frame settings?

 

In my HDRenderPipelineAsset under Rendering these are enabled :
- Motion Vectors
- Transparent Depth Prepass

In my HDRenderPipelineGlobalSettings under Rendering these are enabled:
- Depth Prepass within Deferred

 

Ok so it's definitely not related to this problem.

BTW. What version of Unity are you on?

 

2022.2.7

Would be wonderful if anyone could post a working example. The documentation on this is pretty sparse.

 

I referenced this thread last year to find the new 'RenderX" functions and RenderParams for procedural rendering and to get object motion vectors working on procedural geometry.

This worked fine at the time up until 2022.2.0b3 and then stopped working on 2022.2.0b4 and all versions I've tested that are newer than that including 2023.

You might be encountering the same regression bug. I have a thread about it here: https://forum.unity.com/threads/cus...-indirect-rendering-after-2022-2-0b3.1379979/

and the Issue Tracker URL is here: https://issuetracker.unity3d.com/is...k-when-rendering-a-custom-shader-procedurally

Considering it's approaching 1 year since I first attempted to submit the bug I'm not holding my breath for a fix, but hopefully someone ( @JarkkoUnity ?) can address it soon so I can update from 2022.2.0b3. Last year my bug report was mishandled on Unity's end and not properly submitted and its only been around a month since my resubmission has gone through the the Issue Tracker so fingers crossed.

 

Hi will the CommandBuffer API also get updated with similar RenderX methods?

 

Hey, any updates on that ? Issue still apear in 2022.3.12f using
Graphics.DrawMeshInstancedIndirect()

 

you have to use the new api: https://docs.unity3d.com/ScriptReference/Graphics.RenderMeshInstanced.html