GeometryCollectionRenderLevelSetActor.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "GeometryCollection/GeometryCollection.h"
#include "Engine/VolumeTexture.h"
#include "Chaos/Levelset.h"
#include "Engine/StaticMesh.h"
#include "Components/PostProcessComponent.h"
#include "Materials/MaterialInstanceDynamic.h"
 
#include "GeometryCollectionRenderLevelSetActor.generated.h"
 
 
UCLASS(MinimalAPI)
class AGeometryCollectionRenderLevelSetActor : public AActor
{
    GENERATED_UCLASS_BODY()
public:
 
    static GEOMETRYCOLLECTIONENGINE_API int InstanceCount;
 
    // Volume texture to fill   
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Volume")
    TObjectPtr<UVolumeTexture> TargetVolumeTexture;
 
    // Material that performs ray marching.  Note this must have certain parameters in order
    // to work correctly
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
    TObjectPtr<UMaterial> RayMarchMaterial;
 
    // Surface tolerance used for rendering.  When surface reconstruction is noisy,
    // try tweaking this value
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
    float SurfaceTolerance;
 
    // Isovalue of the level set to use for surface reconstruction.  Generally you want
    // this to be zero, but it can be useful for exploring the distance values to make
    // this negative to see the interior structure of the levelset 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
    float Isovalue;
 
    // Enable or disable rendering
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
    bool Enabled;
 
    // Enable or disable rendering
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
    bool RenderVolumeBoundingBox;
 
    // Find/create the level set renderer singleton actor as required. Return whether the found or created actor.
    static GEOMETRYCOLLECTIONENGINE_API AGeometryCollectionRenderLevelSetActor* FindOrCreate(UWorld* World);
 
    // Load a new level set to render
    GEOMETRYCOLLECTIONENGINE_API bool SetLevelSetToRender(const Chaos::FLevelSet &LevelSet, const FTransform &LocalToWorld);
 
    // Sync level set transform to the render material
    GEOMETRYCOLLECTIONENGINE_API void SyncLevelSetTransform(const FTransform &LocalToWorld);
 
    // Some initialization happens in here 
    GEOMETRYCOLLECTIONENGINE_API virtual void BeginPlay() override;
 
#if WITH_EDITOR
    // Allowed for live updates to parameters from inside the editor when ejected
    GEOMETRYCOLLECTIONENGINE_API virtual void PostEditChangeProperty(struct FPropertyChangedEvent& e) override;
#endif
 
    // set and sync enabled
    void SetEnabled(bool enabled)
    {
        Enabled = enabled;
        PostProcessComponent->bEnabled = Enabled;
    }
 
private:
    FVector MinBBoxCorner;
    FVector MaxBBoxCorner;
 
    FMatrix WorldToLocal;
 
    float VoxelSize;
 
    UPostProcessComponent *PostProcessComponent;
 
    // Dynamic material instance so we can update parameters based on volume changes
    UMaterialInstanceDynamic* DynRayMarchMaterial;
 
    // Synchronizes the state of this actor class with the post process render material
    GEOMETRYCOLLECTIONENGINE_API void SyncMaterialParameters();
 
    // Private for now since step size mult might not be super useful due to the current
    // rendering algorithms employed in the shaders
    // @todo: expose this in a meaningful way in the future if necessary
    // UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
    float StepSizeMult;
};