cam_pos      = [-1.27228, 1.48254, 0.689784]';
cam_dir      = [0.580468, 0.0669438, 0.811527]';
cam_up       = [0.124635, 0.977567, -0.169789]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.07024, -0.265602, -0.743607]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;