RuntimeMeshSlicer.h

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// Copyright 2016-2018 Chris Conway (Koderz). All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "Kismet/BlueprintFunctionLibrary.h"
#include "RuntimeMeshBuilder.h"
#include "RuntimeMeshSlicer.generated.h"


struct FUtilPoly2D;
struct FUtilEdge3D;
struct FKConvexElem;

UENUM()
enum class ERuntimeMeshSlicerCapOption : uint8
{
        NoCap,
        CreateNewSectionForCap,
        UseLastSectionForCap
};

UCLASS()
class RUNTIMEMESHCOMPONENT_API URuntimeMeshSlicer : public UBlueprintFunctionLibrary
{
        GENERATED_BODY()


        
        static int32 CompareBoxPlane(const FBox& InBox, const FPlane& InPlane);

        static FRuntimeMeshAccessorVertex InterpolateVert(const FRuntimeMeshAccessorVertex& V0, const FRuntimeMeshAccessorVertex& V1, float Alpha);

        static void Transform2DPolygonTo3D(const FUtilPoly2D& InPoly, const FMatrix& InMatrix, TSharedPtr<FRuntimeMeshAccessor> OutMesh);

        static bool TriangulatePoly(TSharedPtr<FRuntimeMeshAccessor> Mesh, int32 VertBase, const FVector& PolyNormal);

        static void SliceConvexElem(const FKConvexElem& InConvex, const FPlane& SlicePlane, TArray<FVector>& OutConvexVerts);

        static void SliceRuntimeMeshConvexCollision(URuntimeMesh* InRuntimeMesh, URuntimeMesh* OutOtherHalf, FVector PlanePosition, FVector PlaneNormal);

        static void SliceRuntimeMeshSection(const FRuntimeMeshDataPtr& InRuntimeMesh, const FRuntimeMeshDataPtr& OutOtherHalf, int32 SectionIndex, const FPlane& SlicePlane, TArray<FUtilEdge3D>& ClipEdges);

        static int32 CapMeshSlice(const FRuntimeMeshDataPtr& InRuntimeMesh, const FRuntimeMeshDataPtr& OutOtherHalf, TArray<FUtilEdge3D>& ClipEdges, const FPlane& SlicePlane, FVector PlaneNormal, ERuntimeMeshSlicerCapOption CapOption);


public:

        UFUNCTION(BlueprintCallable, Category = "Components|RuntimeMesh")
        static void SliceRuntimeMesh(URuntimeMesh* InRuntimeMesh, FVector PlanePosition, FVector PlaneNormal, URuntimeMesh* OutOtherHalf, ERuntimeMeshSlicerCapOption CapOption, UMaterialInterface* CapMaterial);

        UFUNCTION(BlueprintCallable, Category = "Components|RuntimeMesh")
        static void SliceRuntimeMeshComponent(URuntimeMeshComponent* InRuntimeMesh, FVector PlanePosition, FVector PlaneNormal, bool bCreateOtherHalf, URuntimeMeshComponent*& OutOtherHalf, ERuntimeMeshSlicerCapOption CapOption, UMaterialInterface* CapMaterial);

};