cam_pos      = [0.494752, 1.50074, 0.302512]';
cam_dir      = [-0.582511, 0.447225, -0.678728]';
cam_up       = [0.604555, 0.79654, 0.00600008]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.722613, 0.541089, 0.976705]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;