public override bool Equals(object obj)
{
var that = (TMat3x3)obj;
return that.xx == this.xx && that.xy == this.xy && that.xz == this.xz && that.yx == this.yx && that.yy == this.yy && that.yz == this.xz && that.zx == this.zx && that.zy == this.zy && that.zz == this.xz;
}