cam_pos      = [-0.591834, 0.883318, 0.0505207]';
cam_dir      = [-0.128663, 0.168801, -0.977217]';
cam_up       = [0.991628, 0.0327602, -0.124901]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0145374, 1.31019, 0.228232]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;