text: /*
   *  Copyright (c) 2016-2021 Jeremy HU <jeremy-at-dust3d dot org>. All rights reserved. 
   *
   *  Permission is hereby granted, free of charge, to any person obtaining a copy
   *  of this software and associated documentation files (the "Software"), to deal
   *  in the Software without restriction, including without limitation the rights
   *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   *  copies of the Software, and to permit persons to whom the Software is
   *  furnished to do so, subject to the following conditions:
  
   *  The above copyright notice and this permission notice shall be included in all
   *  copies or substantial portions of the Software.
  
   *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   *  SOFTWARE.
   */
  
  #include <Eigen/Dense>
  #include <dust3d/uv/uv_mesh_data_type.h>
  
  namespace dust3d
  {
  namespace uv
  {
  
  float dotProduct(const Vector3 &first, const Vector3 &second)
  {
      Eigen::Vector3d v(first.xyz[0], first.xyz[1], first.xyz[2]);
      Eigen::Vector3d w(second.xyz[0], second.xyz[1], second.xyz[2]);
      return v.dot(w);
  }
  
  Vector3 crossProduct(const Vector3 &first, const Vector3 &second)
  {
      Eigen::Vector3d v(first.xyz[0], first.xyz[1], first.xyz[2]);
      Eigen::Vector3d w(second.xyz[0], second.xyz[1], second.xyz[2]);
      auto u = v.cross(w);
      Vector3 result;
      result.xyz[0] = u.x();
      result.xyz[1] = u.y();
      result.xyz[2] = u.z();
      return result;
  }
  
  }
  }
  