cam_pos      = [-0.809732, 1.49985, -1.25408]';
cam_dir      = [-0.378722, 0.236701, 0.89473]';
cam_up       = [0.067706, 0.971238, -0.228283]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.22763, 0.0344163, 0.510527]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;