cam_pos      = [0.299691, 1.84362, 0.584364]';
cam_dir      = [-0.122558, -0.160079, 0.979466]';
cam_up       = [-0.525556, 0.847641, 0.0727727]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.11971, 0.672775, 0.250061]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;