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

//~=============================================================================
// TetrahedronBuilder: Builds an octahedron (not tetrahedron) - experimental.
//~=============================================================================

#pragma once

#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "UObject/UObjectGlobals.h"
#include "Builders/EditorBrushBuilder.h"
#include "TetrahedronBuilder.generated.h"

class ABrush;

UCLASS(MinimalAPI, autoexpandcategories = BrushSettings, EditInlineNew, meta = (DisplayName = "Sphere"))
class UTetrahedronBuilder: public UEditorBrushBuilder
{
public:
    GENERATED_BODY()

public:
    UTetrahedronBuilder(const FObjectInitializer& ObjectInitializer = FObjectInitializer::Get());

    /** The radius of this sphere */
    UPROPERTY(EditAnywhere, Category = BrushSettings, meta = (ClampMin = "0.000001"))
    float Radius;

    /** How many iterations this sphere uses to tessellate its geometry */
    UPROPERTY(EditAnywhere, Category = BrushSettings, meta = (ClampMin = "1", ClampMax = "5", DisplayName = "Tessellation"))
    int32 SphereExtrapolation;

    UPROPERTY()
    FName GroupName;

    //~ Begin UBrushBuilder Interface
    virtual bool Build(UWorld* InWorld, ABrush* InBrush = NULL) override;
    //~ End UBrushBuilder Interface

    // @todo document
    virtual void Extrapolate(int32 a, int32 b, int32 c, int32 Count, float InRadius);

    // @todo document
    virtual void BuildTetrahedron(float R, int32 InSphereExtrapolation);
};