GetMeshDescription Package Error and VertexAttributes().SetAttribute Tangent Issue

eray_ozr · March 6, 2022, 3:08am

Object bounds dont work after VertexAttributes().SetAttribute and materials lost their opacity. I think it’s about tangents and normals.

Also GetMeshDescription gives package error as ‘GetMeshDescription’: is not a member of ‘UStaticMesh’

I can create same effect with “Editable Mesh” and get vertices from a custom recursive GetSectionFromStaticMesh function. But EditableMesh is not part of UE5. I dont want re-write my plugin again for Geometry Scripting changes. Also in my opinion, getting vertices from ProceduralMesh is a bad approach.

So, I created issue for both of them for detailed explenations.
Is there any who can help with them ?

Thank you very much for your times !

github.com/FF-Projects-UE/MeshOperations

Object Bounds Do Not Work After MeshDescription->VertexAttributes().SetAttribute

opened 02:47AM - 06 Mar 22 UTC

ffreality

**Code Link:** https://github.com/FF-Projects-UE/MeshOperations/blob/main/Sourc…e/MeshOperations/Private/MeshOperationsBPLibrary.cpp **Code Line:** Function starts from 199. Move Pivot System starts from 223 in same function. **Get Vertex Locations Method:** FPositionVertexBuffer and convert it to world space. **Move Pivot System:** Mesh Descriptions. **Goal:** Move pivot of runtime imported CAD based static mesh components to center and return them to their original locations. **Issue Description** After pivot change, I can not use `GetComponentBounds` blueprint node or `StaticMeshComponent.Bounds.Origin` to get mesh's origin. It gives original location before vertex movement. Also materials looks different after operation. I think it's about Tangent and Normal calculations because UnrealEngine's Editable Mesh system says that, we should calculate them again after movement. But I dont know how can I do that. ![issue_2](https://user-images.githubusercontent.com/10528447/156906965-07437b5b-b1ad-460e-a54f-6c2da6e7292b.jpg)

github.com/FF-Projects-UE/MeshOperations

GetMeshDescription gives package error.

opened 02:52AM - 06 Mar 22 UTC

ffreality

**Code Link:** https://github.com/FF-Projects-UE/MeshOperations/blob/main/Sourc…e/MeshOperations/Private/MeshOperationsBPLibrary.cpp **Code Line:** Function starts from 199. Move Pivot System starts from 223 in same function. **Get Vertex Locations Method:** FPositionVertexBuffer and convert it to world space. **Move Pivot System:** Mesh Descriptions. **Goal:** Move pivot of runtime imported CAD based static mesh components to center and return them to their original locations. **Issue Description:** When I want to try package my project, UE4 gives me this error. 'GetMeshDescription': is not a member of 'UStaticMesh' Also it points me irrelevant .h files such as MorphTargets I added #include "Engine/StaticMesh.h" to my .cpp file but it does not work. ``` Error: UATHelper: Packaging (Windows (64-bit)): [1/3] Module.MeshOperations.cpp UATHelper: Packaging (Windows (64-bit)): D:/Epic/Projects/FROZEN/SDKs/FF_Plugins/Plugins/MeshOperations/Source/MeshOperations/Private/MeshOperationsBPLibrary.cpp(251): error C2039: 'GetMeshDescription': is not a member of 'UStaticMesh' UATHelper: Packaging (Windows (64-bit)): D:\Epic\Engines\UE_4.27\Engine\Source\Runtime\Engine\Classes\Animation/MorphTarget.h(15): note: see declaration of 'UStaticMesh' UATHelper: Packaging (Windows (64-bit)): Took 6.9196636s to run UnrealBuildTool.exe, ExitCode=6 UATHelper: Packaging (Windows (64-bit)): UnrealBuildTool failed. See log for more details. (C:\Users\erayo\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+Epic+Engines+UE_4.27\UBT-FF_Plugins-Win64-Development.txt) UATHelper: Packaging (Windows (64-bit)): AutomationTool exiting with ExitCode=6 (6) UATHelper: Packaging (Windows (64-bit)): BUILD FAILED ```

eray_ozr · March 8, 2022, 4:01am

I converted it to ApplyTransform and issue is about Building not Vertex Attributes.
BuildFromMeshDescription does nothing and Build() just broke opacity also Bounds.Origin remains same.

Also I tried to create new mesh description > reserve vertices → create vertices → BuildFromMeshDescription. This time pivot is true but there is no visualized mesh. I think I need a polygon or tris calculation. But dont know how.