Variable Wind

RenderWorld has the ability to change the ambient wind speed and direction with time. In this example, rather than specifying a wind speed and direction, we give a file which has these as a function of time. Specifically, we start with the wind blowing into 10 degrees (nearly due north) at 4 meters / second. It then increases to 10 m/s over the next 5 seconds. In the following 5 seconds in holds the same speed, but swings around to blow westward (90 degrees).

RenderWorld_data_file ocean 5 5
n_points_x 512 1
n_points_y 512 1
dx 1.0
dy 1.0
spectrum_file spec1.dat
generate_file yes
random_seed 1451
end
number_aux_oceans 0
number_disturbances 0
box_depth 20.
reference_time 0
surface_type round
radius 6371230
max_distance 100
double_distance 70
wind_type yes
wind_file wind.dat
waves yes
water_type 3
external_exact 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

The wind file wind.dat referenced in the disturbance portion of the ocean file has the following form:

       number_of_times 3 
       time   speed    wind_angle 
       0      4        10 
       5      10       10 
       10     10       90

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