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

#include "MaterialEditor/MaterialEditorMeshComponent.h"
#include "Engine/StaticMesh.h"
#include "PhysicsEngine/BodySetup.h"

FBoxSphereBounds UMaterialEditorMeshComponent::CalcBounds(const FTransform& LocalToWorld) const
{
    if (GetStaticMesh())
    {
        // Graphics bounds.
        FBoxSphereBounds NewBounds = GetStaticMesh()->GetBounds().TransformBy(LocalToWorld);

        // Add bounds of collision geometry (if present).
        if (GetStaticMesh()->GetBodySetup())
        {
            // Use more accurate but expensive bounds function for the material editor only
            FBoxSphereBounds AggGeomBounds;
            GetStaticMesh()->GetBodySetup()->AggGeom.CalcBoxSphereBounds(AggGeomBounds, LocalToWorld);
            if (AggGeomBounds.SphereRadius != 0.f)
            {
                NewBounds = Union(NewBounds, AggGeomBounds);
            }
        }

        NewBounds.BoxExtent *= BoundsScale;
        NewBounds.SphereRadius *= BoundsScale;

        return NewBounds;
    }
    else
    {
        return FBoxSphereBounds(LocalToWorld.GetLocation(), FVector::ZeroVector, 0.f);
    }
}