cam_pos      = [0.195643, 1.24438, 0.390299]';
cam_dir      = [-0.582511, 0.447224, -0.678728]';
cam_up       = [0.756439, 0.603854, -0.251317]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.395618, 0.877549, 0.917767]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;