Sometimes the normal vectors will be provided to you in normalized form; however, it is a good idea to normalize all of them just to be sure. Often, when you perform some operations on your normals (eg: cross product) you will end up with different sized vectors, so it's best to normalize them again right before you use them.
Sometimes the normal vectors will be provided to you in normalized form; however, it is a good idea to normalize all of them just to be sure. Often, when you perform some operations on your normals (eg: cross product) you will end up with different sized vectors, so it's best to normalize them again right before you use them.