MeshCaches.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "DynamicVector.h"
 
#include "Async/ParallelFor.h"
#include "MeshQueries.h"
 
namespace UE
{
namespace Geometry
{
 
/*
 * Basic cache of per-triangle information for a mesh
 */
struct FMeshTriInfoCache
{
    TDynamicVector<FVector3d> Centroids;
    TDynamicVector<FVector3d> Normals;
    TDynamicVector<double> Areas;
 
    void GetTriInfo(int TriangleID, FVector3d& NormalOut, double& AreaOut, FVector3d& CentroidOut) const
    {
        NormalOut = Normals[TriangleID];
        AreaOut = Areas[TriangleID];
        CentroidOut = Centroids[TriangleID];
    }
 
    template<class TriangleMeshType>
    static FMeshTriInfoCache BuildTriInfoCache(const TriangleMeshType& Mesh)
    {
        FMeshTriInfoCache Cache;
        int NT = Mesh.MaxTriangleID();
        Cache.Centroids.Resize(NT);
        Cache.Normals.Resize(NT);
        Cache.Areas.Resize(NT);
 
        ParallelFor(NT, [&](int TID)
        {
            if (Mesh.IsTriangle(TID))
            {
                TMeshQueries<TriangleMeshType>::GetTriNormalAreaCentroid(Mesh, TID, Cache.Normals[TID], Cache.Areas[TID], Cache.Centroids[TID]);
            }
        });
 
        return Cache;
    }
};
 
 
} // end namespace UE::Geometry
} // end namespace UE