text: //
  //  SynthesizeTriMeshVertexNormals.h
  //  FilamentViewer
  //
  //  Created by James Walker on 6/3/21.
  //
  /* ___________________________________________________________________________
     COPYRIGHT:
          Copyright (c) 2021, Quesa Developers. All rights reserved.
  
          For the current release of Quesa, please see:
  
              <https://github.com/jwwalker/Quesa>
          
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                notice, this list of conditions and the following disclaimer.
          
              o Redistributions in binary form must reproduce the above
                copyright notice, this list of conditions and the following
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              o Neither the name of Quesa nor the names of its contributors
                may be used to endorse or promote products derived from this
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          THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
          "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
          LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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   */
  
  #ifndef SynthesizeTriMeshVertexNormals_hpp
  #define SynthesizeTriMeshVertexNormals_hpp
  
  struct TQ3TriMeshData;
  struct TQ3Vector3D;
  #include <vector>
  #include <memory>
  
  /*!
  	@function	SynthesizeTriMeshVertexNormals
  	
  	@abstract	Given a TriMesh which presumably does not already have vertex normals, create a
  				set of vertex normals for it by computing weighted averages of face normals.
  	
  	@param		inTMData	TriMesh data.
  	@param		outNormals	Receives synthesized vertex normals.
  */
  void	SynthesizeTriMeshVertexNormals( const TQ3TriMeshData& inTMData,
  										std::vector<TQ3Vector3D>& outNormals );
  
  
  /*!
  	@function	CopyOrSynthesizeVertexNormals
  	
  	@abstract	If TriMesh data contains vertex normal attributes, copy them to a vector, otherwise
  				synthesize them in a simple way.
  	
  	@param	inTMData		The TriMesh data.
  	@param	outNormals		Receives synthesized vertex normals.
  */
  void	CopyOrSynthesizeVertexNormals(
  					const TQ3TriMeshData& inTMData,
  					std::unique_ptr< std::vector<TQ3Vector3D> >& outNormals );
  
  #endif /* SynthesizeTriMeshVertexNormals_hpp */
  