cam_pos      = [-0.542479, 1.40098, 1.75101]';
cam_dir      = [0.992362, 0.0931081, -0.0809182]';
cam_up       = [-0.0841504, 0.990602, 0.107829]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.119963, 0.133261, -1.31786]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;