EM_Task/UnrealEd/Classes/Factories/FbxMeshImportData.h

// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "Factories/FbxAssetImportData.h"
#include "FbxMeshImportData.generated.h"

UENUM(BlueprintType)
enum EFBXNormalImportMethod
{
    FBXNIM_ComputeNormals UMETA(DisplayName = "Compute Normals"),
    FBXNIM_ImportNormals UMETA(DisplayName = "Import Normals"),
    FBXNIM_ImportNormalsAndTangents UMETA(DisplayName = "Import Normals and Tangents"),
    FBXNIM_MAX,
};

UENUM(BlueprintType)
namespace EFBXNormalGenerationMethod
{
enum Type
{
    /** Use the legacy built in method to generate normals (faster in some cases) */
    BuiltIn,
    /** Use MikkTSpace to generate normals and tangents */
    MikkTSpace,
};
}  // namespace EFBXNormalGenerationMethod

UENUM(BlueprintType)
namespace EVertexColorImportOption
{
enum Type
{
    /** Import the static mesh using the vertex colors from the FBX file. */
    Replace,
    /** Ignore vertex colors from the FBX file, and keep the existing mesh vertex colors. */
    Ignore,
    /** Override all vertex colors with the specified color. */
    Override
};
}  // namespace EVertexColorImportOption

/** Action to add nodes to the graph based on selected objects*/
USTRUCT(BlueprintType)
struct FImportMeshLodSectionsData
{
    GENERATED_USTRUCT_BODY();

    /*Every original imported fbx material name for every section*/
    UPROPERTY()
    TArray<FName> SectionOriginalMaterialName;
};

/**
 * Import data and options used when importing any mesh from FBX
 */
UCLASS(BlueprintType, config = EditorPerProjectUserSettings, configdonotcheckdefaults, abstract)
class UFbxMeshImportData: public UFbxAssetImportData
{
    GENERATED_UCLASS_BODY()

    /** If this option is true the node absolute transform (transform, offset and pivot) will be apply to the mesh vertices. */
    UPROPERTY(EditAnywhere, BlueprintReadWrite, AdvancedDisplay, config, Category = Mesh, meta = (ImportType = "StaticMesh"))
    bool bTransformVertexToAbsolute;

    /** - Experimental - If this option is true the inverse node rotation pivot will be apply to the mesh vertices. The pivot from the DCC will then be the origin of the mesh. Note: "TransformVertexToAbsolute" must be false.*/
    UPROPERTY(EditAnywhere, BlueprintReadWrite, AdvancedDisplay, config, Category = Mesh, meta = (EditCondition = "!bTransformVertexToAbsolute", ImportType = "StaticMesh"))
    bool bBakePivotInVertex;

    /** Enables importing of mesh LODs from FBX LOD groups, if present in the FBX file */
    UPROPERTY(EditAnywhere, BlueprintReadWrite, AdvancedDisplay, config, Category = Mesh, meta = (OBJRestrict = "true", ImportType = "Mesh|GeoOnly", ToolTip = "If enabled, creates LOD models for Unreal meshes from LODs in the import file; If not enabled, only the base mesh from the LOD group is imported"))
    uint32 bImportMeshLODs : 1;

    /** Enabling this option will read the tangents(tangent,binormal,normal) from FBX file instead of generating them automatically. */
    UPROPERTY(EditAnywhere, BlueprintReadWrite, AdvancedDisplay, config, Category = Mesh, meta = (ImportType = "Mesh|GeoOnly"))
    TEnumAsByte<enum EFBXNormalImportMethod> NormalImportMethod;

    /** Use the MikkTSpace tangent space generator for generating normals and tangents on the mesh */
    UPROPERTY(EditAnywhere, BlueprintReadWrite, config, AdvancedDisplay, Category = Mesh, meta = (ImportType = "Mesh|GeoOnly"))
    TEnumAsByte<enum EFBXNormalGenerationMethod::Type> NormalGenerationMethod;

    /** Enabling this option will use weighted normals algorithm (area and angle) when computing normals or tangents */
    UPROPERTY(EditAnywhere, BlueprintReadWrite, AdvancedDisplay, config, Category = Mesh, meta = (OBJRestrict = "true", ImportType = "Mesh|GeoOnly"))
    uint32 bComputeWeightedNormals : 1;

    /* If checked, The material list will be reorder to the same order has the FBX file. */
    UPROPERTY(EditAnywhere, BlueprintReadWrite, config, AdvancedDisplay, Category = Material, meta = (OBJRestrict = "true"))
    bool bReorderMaterialToFbxOrder;

    bool CanEditChange(const FProperty* InProperty) const override;

    //////////////////////////////////////////////////////////////////////////
    // Original import section/material data
    UPROPERTY()
    TArray<FName> ImportMaterialOriginalNameData;

    UPROPERTY()
    TArray<FImportMeshLodSectionsData> ImportMeshLodData;
};