69 lines
2.4 KiB
C++
69 lines
2.4 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "BaseGizmos/GizmoElementCircleBase.h"
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#include "InputState.h"
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#include "UObject/ObjectMacros.h"
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#include "GizmoElementTorus.generated.h"
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class FPrimitiveDrawInterface;
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class FMaterialRenderProxy;
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/**
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* Simple object intended to be used as part of 3D Gizmos.
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* Draws a torus based on parameters.
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*
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* Note: the LineTrace method does not perform a true ray-torus intersection!
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* See comment above LineTrace method below for details of how this intersection is approximated.
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*/
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UCLASS(Transient, MinimalAPI)
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class UGizmoElementTorus : public UGizmoElementCircleBase
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{
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GENERATED_BODY()
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public:
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//~ Begin UGizmoElementBase Interface.
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INTERACTIVETOOLSFRAMEWORK_API virtual void Render(IToolsContextRenderAPI* RenderAPI, const FRenderTraversalState& RenderState) override;
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// LineTrace approximates ray-torus intersection by intersecting the ray with the plane in which the torus
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// lies, then determining a hit point closest to the linear circle defined by torus center and torus outer radius.
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// If the torus lies at a glancing angle, the ray-torus intersection is performed against cylinders approximating
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// the shape of the torus.
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INTERACTIVETOOLSFRAMEWORK_API virtual FInputRayHit LineTrace(const UGizmoViewContext* ViewContext, const FLineTraceTraversalState& LineTraceState, const FVector& RayOrigin, const FVector& RayDirection) override;
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//~ End UGizmoElementBase Interface.
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// Inner circles radius.
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INTERACTIVETOOLSFRAMEWORK_API virtual void SetInnerRadius(double InInnerRadius);
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INTERACTIVETOOLSFRAMEWORK_API virtual double GetInnerRadius() const;
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// Number of inner slices for rendering torus.
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INTERACTIVETOOLSFRAMEWORK_API virtual void SetNumInnerSlices(int32 InNumInnerSlices);
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INTERACTIVETOOLSFRAMEWORK_API virtual int32 GetNumInnerSlices() const;
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// If partial, renders end caps when true.
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INTERACTIVETOOLSFRAMEWORK_API virtual void SetEndCaps(bool InEndCaps);
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INTERACTIVETOOLSFRAMEWORK_API virtual bool GetEndCaps() const;
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protected:
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// Torus inner radius.
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UPROPERTY()
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double InnerRadius = 5.0;
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// Number of slices to render in each torus segment.
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UPROPERTY()
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int32 NumInnerSlices = 8;
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// Whether to render end caps on a partial torus.
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UPROPERTY()
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bool bEndCaps = false;
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protected:
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INTERACTIVETOOLSFRAMEWORK_API bool IsGlancingAngle(const UGizmoViewContext* View, const FVector& InWorldCenter, const FVector& InWorldNormal);
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};
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