cam_pos      = [0.489334, 1.50509, 0.31003]';
cam_dir      = [-0.582511, 0.447225, -0.678728]';
cam_up       = [0.634339, 0.772236, -0.0355755]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.675943, 0.600184, 0.975592]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;