sceneGridLines

Create scene comprising an array of grid lines 

   scene = sceneGridLines(scene,[sz=128],[lineSpacing=16],[spectralType='d65'])

 The grid line scene is useful for visualizing the geometric distortion of
 a lens. The spectral power distribution of the lines is set to D65 unless
 spectralType is set to 'ee' (equal energy) or 'ep' (equal photons).

 The sz parameter is the scene size and lineSpacing defines the number of
 samples between the lines.

 Examples:
  scene = sceneCreate;
  scene = sceneGridLines(scene);
  scene = sceneGridLines(scene,128,16,'ee');
  scene = sceneGridLines(scene,128,16,'ep');

 Copyright ImagEval Consultants, LLC, 2003.