cam_pos      = [0.0739713, 1.43366, 0.375284]';
cam_dir      = [-0.792135, -0.0118915, 0.61023]';
cam_up       = [-0.0382193, 0.998814, -0.0301483]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.810167, 0.0627815, 1.05289]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;