cam_pos      = [0.477553, 1.65608, 0.313685]';
cam_dir      = [0.427229, 0.319335, -0.845873]';
cam_up       = [-0.104905, 0.94674, 0.30443]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.19439, 0.054962, -0.582505]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;