UE4 骨骼网格体合并及规范

news2024/12/14 21:23:24

实现代码

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "SkeletalMeshMerge.h"
#include "Kismet/BlueprintFunctionLibrary.h"
#include "AceMeshCombiner.generated.h"

/**
 * 
 */
UCLASS()
class ACEMESHCOMBINE_API UAceMeshCombiner : public UBlueprintFunctionLibrary
{
	GENERATED_BODY()

public:
	UFUNCTION(BlueprintCallable, Category="AceMeshCombine")
	static USkeletalMesh* CombineSkelet(TArray<USkeletalMesh*> SourceMeshList, bool checkValid = false)
	{
		if (checkValid)
		{
			TArray<USkeletalMesh*> SrcList;
			//检查一下，防止mesh为空的情况出现
			for (auto item : SourceMeshList)
			{
				if (item)
				{
					SrcList.Add(item);
				}
			}
			return CombineSkeletNotCheck(SrcList);
		}
		else
		{
			return CombineSkeletNotCheck(SourceMeshList);
		}
	}

	UFUNCTION(BlueprintCallable, Category="AceMeshCombine")
	static USkeletalMesh* CombineSkeletNotCheck(TArray<USkeletalMesh*> SourceMeshList)
	{
		//如果没有需要合并的mesh 返回空
		if (SourceMeshList.Num() == 0)return nullptr;
		//只有一个mesh直接返回源mesh即可
		if (SourceMeshList.Num() == 1)return SourceMeshList[0];
		if (SourceMeshList.Num() >= 2) //模型数量大于两个才合并
		{
			// 创建一个保存最终合成模型 CompositeMesh
			USkeletalMesh* CompositeMesh = NewObject<USkeletalMesh>(GetTransientPackage(), NAME_None, RF_Transient);
			//数组第一项的骨骼作为新的骨骼，合并的所有mesh使用同一套骨骼
			CompositeMesh->SetSkeleton(SourceMeshList[0]->GetSkeleton());
			TArray<FSkelMeshMergeSectionMapping> InForceSectionMapping;
			// 创建引擎合并模型实例MeshMergeUtil，参考引擎源码类SkeletalMeshMerge，里面有具体实现逻辑
			FSkeletalMeshMerge MeshMergeUtil(CompositeMesh, SourceMeshList, InForceSectionMapping, 0);

			// 把SourceMeshList合并到CompositeMesh
			if (MeshMergeUtil.DoMerge())
			{
				return CompositeMesh;
			}
		}

		return nullptr;
	}
};