cam_pos      = [-0.524378, 1.97533, 0.0139231]';
cam_dir      = [0.780158, -0.189372, 0.596232]';
cam_up       = [0.0224368, 0.960939, 0.27585]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.831489, 0.268433, -1.00273]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;