Revert "add a intrinsic rotation on XY plane."
Revert "add a intrinsic rotation on XY plane."

This reverts commit 14ab94e23698130ff0590f13644de5890b0d8b1b.

easz/three.js,easz/three.js,easz/three.js,easz/three.js,easz/three.js,easz/three.js