Excluding Elements

You may wish to exclude certain elements from the primary image because you are going to output them as seperate mattes . You can exclude elements from the image by setting the exclude_items entry to yes. You then add two lines to the ascii file. The first is nItems, which is the number of items to exclude. On the following line you list the names of the items to exclude. Allowable items are glitter, textures, and whitecaps. A sample ocean file that excludes glitter and textures is

RenderWorld_data_file ocean 5 5

n_points_x 512 1

n_points_y 512 1

dx 0.257

dy 0.257

spectrum_file spec1.dat

gen_file yes

seed 91405

end

number_aux_oceans 0

number_disturbances 0

box_depth 20.

reference_time 0

surface_type round

radius 6.37123e+06

max_dist 9999

double_dist 1.

wind_type fixed

wind_dir 180

wind_vel 5

spectrum yes

water_type 3

external_exact no

glitter yes

whitecaps no

texture no

sunbeams no

exclude_items yes

nItems 2

glitter textures

number_of_bands 3

band_ids 1 2 3

index_of_refraction 1.34 1.34 1.34

end

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