DefaultUp and DefaultMatrixAutoUpdate in Z world

Hello ,

because i m managing shadow , i ve seen that i ve got problem with shadow, left and right wasn’t symmetrical while left right of my was similar . i 've used cameHelper to see … and i ve understood that the top of cameraHelper was in Y top world . To solve problem i 've found i have to set at start before creating scene DefaultUp and DefaultMatrixAutoUpdate like this
THREE.Object3D.DefaultUp = new THREE.Vector3(0,0,1);
THREE.Object3D.DefaultMatrixAutoUpdate = true ;
const scene = new THREE.Scene();

work very well , now shadow work symmetrical in Z world .