function l = get_light_directions()

img_start = 0;
img_end = 11;

l = zeros(img_end - img_start + 1, 3);
mask = imread(sprintf('psmImages/chrome/chrome.mask.tga.ppm'));

for i=img_start:img_end
    file = sprintf('psmImages/chrome/chrome.%d.tga.ppm', i);
    l(i+1,1:3) = find_light_direction(imread(file), mask);
end
