cam_pos      = [-0.819409, 1.49943, -1.25807]';
cam_dir      = [-0.378722, 0.236701, 0.89473]';
cam_up       = [0.0436027, 0.970232, -0.238219]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.22956, 0.0681041, 0.502433]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;