cam_pos      = [-0.8, 1.5, -1.25]';
cam_dir      = [-0.378722, 0.236701, 0.89473]';
cam_up       = [0.0922659, 0.971583, -0.217978]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.2248, 0, 0.518433]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;