SplineMeshSceneProxyDesc.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include "CoreMinimal.h"
#include "StaticMeshSceneProxyDesc.h"
#include "Components/SplineMeshComponent.h"
 
class USplineMeshComponent;
 
struct FSplineMeshSceneProxyDesc
{
    FSplineMeshSceneProxyDesc() = default;
    ENGINE_API FSplineMeshSceneProxyDesc(const USplineMeshComponent* InComponent);
    
    void InitializeFrom(const USplineMeshComponent* InComponent);
    
    FSplineMeshParams SplineParams{};
    FVector SplineUpDir = FVector::UpVector;
    float SplineBoundaryMin = 0.0f;
    float SplineBoundaryMax = 0.0f;
    TEnumAsByte<ESplineMeshAxis::Type> ForwardAxis = ESplineMeshAxis::X;
    bool bSmoothInterpRollScale = false;
    FBoxSphereBounds SourceMeshBounds { ForceInit };
 
    FSplineMeshParams GetSplineParams() const { return SplineParams; }
 
    FSplineMeshShaderParams CalculateShaderParams() const;
    float ComputeRatioAlongSpline(float DistanceAlong) const;
    void ComputeVisualMeshSplineTRange(float& MinT, float& MaxT) const;
    ENGINE_API FBox ComputeDistortedBounds(const FTransform& InLocalToWorld, const FBoxSphereBounds& InMeshBounds, const FBoxSphereBounds* InBoundsToDistort = nullptr) const;
    FTransform CalcSliceTransform(const float DistanceAlong) const;
    FTransform CalcSliceTransformAtSplineOffset(const float Alpha, const float MinT, const float MaxT) const;
    
    static void InitVertexFactory(UStaticMesh* Mesh, const ERHIFeatureLevel::Type FeatureLevel, int32 InLODIndex, FColorVertexBuffer* InOverrideColorVertexBuffer);
    static void InitRayTracingProxyVertexFactory(UStaticMesh* Mesh, const ERHIFeatureLevel::Type FeatureLevel, int32 InLODIndex, FColorVertexBuffer* InOverrideColorVertexBuffer);
};