cam_pos      = [0.532431, 1.45609, 1.40271]';
cam_dir      = [-0.936741, 0.00511755, 0.349986]';
cam_up       = [-0.175832, 0.857696, -0.483157]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.402531, 0.683794, 1.06738]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;