td></tr>
  <tr><td style="white-space: nowrap;" class="col1">'tilesize', S</td> <td>Side length of square tiles on the floor (default 0.2)</td></tr>
  <tr><td style="white-space: nowrap;" class="col1">'tile1color', C</td> <td>Color of even tiles [r g b] (default [0.5 1 0.5]  light green)</td></tr>
  <tr><td style="white-space: nowrap;" class="col1">'tile2color', C</td> <td>Color of odd tiles [r g b] (default [1 1 1] white)</td></tr>
  <tr></tr>
  <tr></tr>  <tr><td style="white-space: nowrap;" class="col1">