cam_pos      = [0.307683, 1.67998, 1.92129]';
cam_dir      = [0.669632, -0.283274, -0.686548]';
cam_up       = [-0.0102636, 0.920786, -0.389933]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.987687, -0.35665, -0.816194]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;