cam_pos      = [-0.908555, 1.54243, -1.09921]';
cam_dir      = [-0.378722, 0.236701, 0.89473]';
cam_up       = [-0.078496, 0.955044, -0.285883]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.22649, 0.237409, 0.456344]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;