# Controlling Reflection Qualities

The reflections of skylight and objects from the water surface include the effects of very small waves. Additional control over the glassiness of water reflections is available by altering the ocean spectrum. The ocean surface can be changed to suppress small waves below a cutoff. The line `spectrum` `glassy` chooses this option, and the `scale` `10.0` suppresses all waves smaller that 10 meters size.

  `RenderWorld_data_file ocean` `5 5`
  `n_points_x 1024 1`
  `n_points_y 1024 1`
  `dx 0.75`
  `dy 0.75`
  `spectrum_file spec_ocean_basic.dat`
  `generate_file yes`
  `seed 1110`
  `end`
  `number_aux_oceans 0`
  `number_disturbances 0`
  `box_depth 20.`
  `reference_time 0`
  `surface_type flat`
  `max_distance 500`
  `double_distance 2000`
  `wind_type fixed`
  `wind_direction 90`
  `wind_velocity 3.0`
  `spectrum` `glassy`
  `scale` `10.0`
  `water_type 3`
  `external_exact yes`
  `max_distance 500`
  `sharpening_factor` `0.1`
  `image everything`
  `reflection_method specular`
  `shadow_air no`
  `glitter no`
  `whitecaps no`
  `textures no`
  `sunbeams no`
  `exclude_items no`
  `number_of_bands 3`
  `band_ids 1 2 3`
  `index_of_refraction 1.34 1.34 1.34`
  `end`

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