text: //////////////////////////////////////////////////////////////////////////
  //
  //  Copyright (c) 2009-2011, Image Engine Design Inc. All rights reserved.
  //
  //  Redistribution and use in source and binary forms, with or without
  //  modification, are permitted provided that the following conditions are
  //  met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //
  //     * Redistributions in binary form must reproduce the above copyright
  //       notice, this list of conditions and the following disclaimer in the
  //       documentation and/or other materials provided with the distribution.
  //
  //     * Neither the name of Image Engine Design nor the names of any
  //       other contributors to this software may be used to endorse or
  //       promote products derived from this software without specific prior
  //       written permission.
  //
  //  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 A PARTICULAR
  //  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  //  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  //  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  //  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  //  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  //  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  //  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  //  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  //////////////////////////////////////////////////////////////////////////
  
  #ifndef IE_CORE_CURVEEXTRUDEOP_H
  #define IE_CORE_CURVEEXTRUDEOP_H
  
  #include <vector>
  
  #include "IECore/Export.h"
  #include "IECore/Op.h"
  #include "IECore/NumericParameter.h"
  #include "IECore/SimpleTypedParameter.h"
  #include "IECore/TypedPrimitiveParameter.h"
  #include "IECore/CurvesPrimitive.h"
  #include "IECore/PatchMeshPrimitive.h"
  
  namespace IECore
  {
  
  IE_CORE_FORWARDDECLARE( ObjectParameter )
  
  /// The CurveExtrudeOp lofts RiCurves into RiPatchMesh cylinders, obeying any width primvars present.
  /// \ingroup geometryProcessingGroup
  class IECORE_API CurveExtrudeOp : public Op
  {
  	public :
  
  		IE_CORE_DECLARERUNTIMETYPED( CurveExtrudeOp, Op );
  
  		CurveExtrudeOp();
  		virtual ~CurveExtrudeOp();
  
  		CurvesPrimitiveParameter *curvesParameter();
  		const CurvesPrimitiveParameter *curvesParameter() const;
  
  		V2iParameter *resolutionParameter();
  		const V2iParameter *resolutionParameter() const;
  
  	protected :
  
  		virtual ObjectPtr doOperation( const CompoundObject *operands );
  
  		void buildReferenceFrames( const std::vector< Imath::V3f > &points, std::vector< Imath::V3f > &tangents, std::vector< Imath::M44f > &frames ) const;
  
  		PatchMeshPrimitivePtr buildPatchMesh( const CurvesPrimitive * curves, unsigned curveIndex, unsigned vertexOffset, unsigned varyingOffset ) const;
  
  	private :
  
  		CurvesPrimitiveParameterPtr m_curvesParameter;
  		V2iParameterPtr m_resolutionParameter;
  
  		struct VaryingFn;
  		struct VertexFn;
  		struct UniformFn;
  
  };
  
  IE_CORE_DECLAREPTR( CurveExtrudeOp );
  
  } // namespace IECore
  
  #endif // IE_CORE_CURVEEXTRUDEOP_H
  