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105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "GameFramework/Actor.h"
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#include "GeometryCollection/GeometryCollection.h"
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#include "Engine/VolumeTexture.h"
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#include "Chaos/Levelset.h"
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#include "Engine/StaticMesh.h"
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#include "Components/PostProcessComponent.h"
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#include "Materials/MaterialInstanceDynamic.h"
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#include "GeometryCollectionRenderLevelSetActor.generated.h"
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/**
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* AGeometryCollectionRenderLevelSetActor
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* An actor representing the collection of data necessary to
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* render volumes. This references a ray marching material, which
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* is used internally by a post process component blendable. This
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* is a workflow that can be improved with a deeper implementation
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* in the future if we decide to. Note that behavior with multiple
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* render level set actors isn't currently supported very well,
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* but could be improved in the future
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*/
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UCLASS()
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class GEOMETRYCOLLECTIONENGINE_API AGeometryCollectionRenderLevelSetActor : public AActor
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{
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GENERATED_UCLASS_BODY()
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public:
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static int InstanceCount;
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// Volume texture to fill
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Volume")
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UVolumeTexture *TargetVolumeTexture;
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// Material that performs ray marching. Note this must have certain parameters in order
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// to work correctly
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
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UMaterial *RayMarchMaterial;
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// Surface tolerance used for rendering. When surface reconstruction is noisy,
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// try tweaking this value
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
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float SurfaceTolerance;
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// Isovalue of the level set to use for surface reconstruction. Generally you want
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// this to be zero, but it can be useful for exploring the distance values to make
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// this negative to see the interior structure of the levelset
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
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float Isovalue;
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// Enable or disable rendering
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
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bool Enabled;
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// Enable or disable rendering
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
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bool RenderVolumeBoundingBox;
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// Load a new level set to render
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bool SetLevelSetToRender(const Chaos::TLevelSet<float, 3> &LevelSet, const FTransform &LocalToWorld);
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// Sync level set transform to the render material
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void SyncLevelSetTransform(const FTransform &LocalToWorld);
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// Some initialization happens in here
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virtual void BeginPlay() override;
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#if WITH_EDITOR
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// Allowed for live updates to parameters from inside the editor when ejected
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virtual void PostEditChangeProperty(struct FPropertyChangedEvent& e) override;
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#endif
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// set and sync enabled
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void SetEnabled(bool enabled)
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{
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Enabled = enabled;
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PostProcessComponent->bEnabled = Enabled;
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}
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private:
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FVector MinBBoxCorner;
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FVector MaxBBoxCorner;
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FMatrix WorldToLocal;
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float VoxelSize;
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UPostProcessComponent *PostProcessComponent;
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// Dynamic material instance so we can update parameters based on volume changes
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UMaterialInstanceDynamic* DynRayMarchMaterial;
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// Synchronizes the state of this actor class with the post process render material
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void SyncMaterialParameters();
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// Private for now since step size mult might not be super useful due to the current
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// rendering algorithms employed in the shaders
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// @todo: expose this in a meaningful way in the future if necessary
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// UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Rendering")
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float StepSizeMult;
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}; |