cam_pos      = [-0.319113, 1.15879, 1.18148]';
cam_dir      = [0.784063, -0.00247931, -0.620677]';
cam_up       = [-0.192839, 0.949531, -0.247395]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.784653, -0.417173, -0.989539]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;