An important aspect of each modifier is that you will lose any effects it

produces once you remove them from any object. If you want to make

the effects permanent, use the "Apply" option available in each modifier.

After using that option, the modifier disappears from the list, and the

modification becomes part of the object.

That is useful when you have a project where you must create an object

based on multiple modifiers, which you can also use as a reference to

start modeling. For instance, it is possible to add a Mirror Modifier and

make it a permanent part of a 3D model.

Tip: Before applying a modifier's effects, you should make a backup

copy of your 3D model and place it to a different Collection. By hiding

that Collection, you keep an untouched version of any 3D model with all

modifiers.

4.2 Subdivision Surface modifier

One of the most used modifiers for modeling is the Subdivision Surface,

which smoothes your 3D models by adding lots of new faces to the

selected polygon. The modifier is one of the primary tools for techniques

such as mesh modeling.

A popular workflow for many modeling projects is to start with a low poly

version of an object, and later apply a modification to increase polygon

count. By adding more polygons, it is also possible to smooth existing

surfaces.

Figure 4.4 shows an example of the results of a Subdivision Surface

Modifier (High Poly).