cam_pos      = [0.700696, 1.39137, -0.184671]';
cam_dir      = [-0.914184, -0.300877, -0.271552]';
cam_up       = [-0.24634, 0.944528, -0.217219]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.428053, 0.17514, 1.24699]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;