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 * modification, are permitted provided that the following conditions are
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 *
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 * in the documentation and/or other materials provided with the
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/**
 * The DrawContext defines the parameters used for a particular drawing pass.
 * It contains two 4-by-4 matrix params, view and
 * projection. These correspond to the viewing and projection transformation
 * matrices.
 * 
 * @param {!o3d.Matrix4} opt_view The view matrix for this DrawContext.
 * @param {!o3d.Matrix4} opt_projection The projection matrix
 *     for this DrawContext.
 * @constructor
 */
o3d.DrawContext = function(opt_view, opt_projection) {
  this.view = opt_view ||
      [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]];
  this.projection = opt_projection ||
      [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]];
};
o3d.inherit('DrawContext', 'NamedObject');


/**
 * The view matrix represents the viewing transformation, used to take vertices
 * from world space to view space.
 * @type {o3d.Matrix4}
 */
o3d.DrawContext.prototype.view = [];



/**
 * The projection matrix represents the projection transformation, used to take
 * vertices from view space to screen space.  This matrix is usually an
 * orthographic or perspective transformation.
 * @type {o3d.Matrix4}
 */
o3d.DrawContext.prototype.projection = [];