From 0f7c938d47a6e3bef7fbadd53b567af404ad3969 Mon Sep 17 00:00:00 2001
From: BlueRose <378100977@qq.com>
Date: Tue, 7 Jan 2025 16:26:40 +0800
Subject: [PATCH] vault backup: 2025-01-07 16:26:40

---
 ...oceduralMeshComponent实时载入StaticMesh.md | 92 +++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/03-UnrealEngine/Gameplay/Gameplay/Assimp & UProceduralMeshComponent实时载入StaticMesh.md b/03-UnrealEngine/Gameplay/Gameplay/Assimp & UProceduralMeshComponent实时载入StaticMesh.md
index eceafc4..f4cb8c5 100644
--- a/03-UnrealEngine/Gameplay/Gameplay/Assimp & UProceduralMeshComponent实时载入StaticMesh.md	
+++ b/03-UnrealEngine/Gameplay/Gameplay/Assimp & UProceduralMeshComponent实时载入StaticMesh.md	
@@ -180,3 +180,95 @@ Editor转换成StaticMesh逻辑：
 FProceduralMeshComponentDetails::ClickedOnConvertToStaticMesh()
 
 https://forums.unrealengine.com/t/procedural-mesh-not-saving-all-of-its-sections-to-static-mesh/382319/10
+感觉链接中的这个代码是正确：
+```c++
+//Hallo from Unreal Forums
+UStaticMesh* UWeedFarmerBFL::SaveProcmesh(UProceduralMeshComponent* ProcMesh, FString SavePath, FString Name)
+{
+	UProceduralMeshComponent* ProcMeshComp = ProcMesh;
+	if (ProcMeshComp != nullptr)
+	{
+		FString PackageName = SavePath;
+		FRawMesh RawMesh;
+		TArray<UMaterialInterface*> MeshMaterials;
+		const int32 NumSections = ProcMeshComp->GetNumSections();
+		int32 VertexBase = 0;
+		for (int32 SectionIdx = 0; SectionIdx < NumSections; SectionIdx++)
+		{
+			FProcMeshSection* ProcSection = ProcMeshComp->GetProcMeshSection(SectionIdx);
+			// Copy verts
+			for (FProcMeshVertex& Vert : ProcSection->ProcVertexBuffer)
+			{
+				RawMesh.VertexPositions.Add(FVector3f(Vert.Position));
+			}
+			// Copy 'wedge' info
+			int32 NumIndices = ProcSection->ProcIndexBuffer.Num();
+			for (int32 IndexIdx = 0; IndexIdx < NumIndices; IndexIdx++)
+			{
+				int32 Index = ProcSection->ProcIndexBuffer[IndexIdx];
+				RawMesh.WedgeIndices.Add(Index + VertexBase);
+				FProcMeshVertex& ProcVertex = ProcSection->ProcVertexBuffer[Index];
+				FVector3f TangentX = FVector3f(ProcVertex.Tangent.TangentX);
+				FVector3f TangentZ = FVector3f(ProcVertex.Normal);
+				FVector3f TangentY = FVector3f(
+					(TangentX ^ TangentZ).GetSafeNormal() * (ProcVertex.Tangent.bFlipTangentY ? -1.f : 1.f));
+				RawMesh.WedgeTangentX.Add(TangentX);
+				RawMesh.WedgeTangentY.Add(TangentY);
+				RawMesh.WedgeTangentZ.Add(TangentZ);
+				RawMesh.WedgeTexCoords[0].Add(FVector2f(ProcVertex.UV0));
+				RawMesh.WedgeColors.Add(ProcVertex.Color);
+			}
+			// copy face info
+			int32 NumTris = NumIndices / 3;
+			for (int32 TriIdx = 0; TriIdx < NumTris; TriIdx++)
+			{
+				RawMesh.FaceMaterialIndices.Add(SectionIdx);
+				RawMesh.FaceSmoothingMasks.Add(0); // Assume this is ignored as bRecomputeNormals is false
+			}
+			// Remember material
+			MeshMaterials.Add(ProcMeshComp->GetMaterial(SectionIdx));
+			// Update offset for creating one big index/vertex buffer
+			VertexBase += ProcSection->ProcVertexBuffer.Num();
+		}
+		// If we got some valid data.
+		if (RawMesh.VertexPositions.Num() > 3 && RawMesh.WedgeIndices.Num() > 3)
+		{
+			// Then find/create it.
+			UPackage* Package = CreatePackage(*PackageName);
+			check(Package);
+			// Create StaticMesh object
+			UStaticMesh* StaticMesh = NewObject<UStaticMesh>(Package, FName(*Name), RF_Public | RF_Standalone);
+			StaticMesh->InitResources();
+			FGuid::NewGuid() = StaticMesh->GetLightingGuid();
+			//StaticMesh->GetLightingGuid() = FGuid::NewGuid();
+			// Create a Source Model then set it to variable
+			StaticMesh->AddSourceModel();
+			FStaticMeshSourceModel& SrcModel = StaticMesh->GetSourceModel(0);
+			// Add source to new StaticMesh
+			SrcModel.BuildSettings.bRecomputeNormals = false;
+			SrcModel.BuildSettings.bRecomputeTangents = false;
+			SrcModel.BuildSettings.bRemoveDegenerates = false;
+			SrcModel.BuildSettings.bUseHighPrecisionTangentBasis = false;
+			SrcModel.BuildSettings.bUseFullPrecisionUVs = false;
+			SrcModel.BuildSettings.bGenerateLightmapUVs = true;
+			SrcModel.BuildSettings.SrcLightmapIndex = 0;
+			SrcModel.BuildSettings.DstLightmapIndex = 1;
+			SrcModel.RawMeshBulkData->SaveRawMesh(RawMesh);
+			// Copy materials to new mesh
+			for (UMaterialInterface* Material : MeshMaterials)
+			{
+				StaticMesh->GetStaticMaterials().Add(FStaticMaterial(Material));
+			}
+			//Set the Imported version before calling the build
+			StaticMesh->ImportVersion = EImportStaticMeshVersion::LastVersion;
+			// Build mesh from source
+			StaticMesh->Build(false);
+			StaticMesh->PostEditChange();
+			// Notify asset registry of new asset
+			FAssetRegistryModule::AssetCreated(StaticMesh);
+			return StaticMesh;
+		}
+	}
+	return nullptr;
+}
+```
\ No newline at end of file