cam_pos      = [0.384654, 1.4829, 1.49585]';
cam_dir      = [-0.979387, -0.0799566, 0.185494]';
cam_up       = [-0.172412, 0.809355, -0.561443]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.139969, 0.773863, 1.07259]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;