cam_pos      = [0.184025, 1.0274, 0.661166]';
cam_dir      = [0.568982, 0.411289, -0.71211]';
cam_up       = [-0.773216, -0.0272674, -0.633556]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.372389, -1.21176, -0.402326]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;