cam_pos      = [-0.102715, 1.26069, 1.33535]';
cam_dir      = [0.658438, -0.0635338, -0.749948]';
cam_up       = [-0.285013, 0.901173, -0.32658]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.926454, -0.570275, -0.765094]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;