cam_pos      = [-0.282362, 0.968562, 0.618803]';
cam_dir      = [-0.582511, 0.447224, -0.678728]';
cam_up       = [0.811924, 0.359409, -0.460005]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0508266, 1.08931, 0.761388]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;