cam_pos      = [-0.620594, 1.40856, 0.932696]';
cam_dir      = [-0.455428, 0.152401, -0.877131]';
cam_up       = [0.841492, 0.395341, -0.368234]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.386561, 1.20472, 0.410031]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;