Introduction

Modifiers are automatic operations that affect an object’s geometry in a non-destructive way. With modifiers, you can perform many effects automatically that would otherwise be too tedious to do manually (such as subdivision surfaces) and without affecting the base geometry of your object.

They work by changing how an object is displayed and rendered, but not the geometry which you can edit directly. You can add several modifiers to a single object to form The Modifier Stack and Apply a modifier if you wish to make its changes permanent.

They can be added to the active object using the Add Modifier operator, the “Add Modifier” button at the top of Modifiers tab in the Properties, or using Shift-A in the same tab. New modifiers are always added at the bottom of the stack (i.e. will be applied last).

There are many built-in modifiers but Blender also allows users to make their own modifiers through Geometry Nodes.

Categories

There are four categories of built-in modifiers:

Edit

Similar to the Deform modifiers (see below), however, they usually do not directly affect the geometry of the object, but some other data, such as vertex groups.

Generate

Constructive/destructive modifiers that will affect the whole Topology of the mesh. They can change the general appearance of the object, or add new geometry to it…

Deform

Unlike Generate ones above, these modifiers only change the shape of an object, without altering its topology.

Simulate

Represent physics simulations. In most cases, they are automatically added to the modifiers stack whenever a Particle System or Physics simulation is enabled. Their only role is to define the position in the modifier stack from which is taken the base data for the simulation they represent. As such, they typically have no properties, and are controlled by settings exposed in separate sections of the Properties.

You will also notice a category called “Hair”, this category comes from a bundled Asset Library that is distributed with Blender. See Hair Nodes for more information.

Users can make their own categories by making geometry node groups assets and assigning them to a Asset Catalog. This catalog name will be the category name. If a user creates a catalog with the same name as one of the built-in categories the node group will be added to the bottom of the corresponding menu.

Node Groups that are non-assets or that do not belong to a category will be available in the “Unassigned” sub-menu.

Note

Geometry Node Groups must have the Modifier property enabled for the node group to show up in the Add Modifier menu.

Interface

Each modifier’s interface shares the same basic components, see Fig. Panel layout (Subdivision Surface as an example)..

At the top is the panel header. The icons each represent different settings for the modifier (left to right):

Expand (down/right arrow icon)

Collapse modifier to show only the header and not its options.

Type

An icon as a quick visual reference of the modifier’s type.

Name

Every modifier has a unique name per object. Two modifiers on one object must have unique names, but two modifiers on different objects can have the same name. The default name is based on the modifier type.

Show on Cage (vertices triangle icon) – Meshes only

Depends on the previous setting, if enabled, the modified geometry can also be edited directly, instead of the original one.

Warning

While it shows edited items in their final, modified positions, you are still actually editing original data. This can lead to strong and unpredictable effects with some tools, and should be disabled whenever you need to perform complex or precise editing on the mesh.

Show in Edit Mode (vertices square icon)

Display the modified geometry in Edit Mode, as well as the original geometry which you can edit.

Show in Viewport (screen icon)

Toggle visibility of the modifier’s effect in the 3D Viewport.

Render (camera icon)

Toggle visibility of the modifier’s effect in the render.

Note

The Square, Triangle and Surface icons may not be available, depending on the type of object and modifier.

Apply On Spline Points (point surface icon) – Curves, surfaces and texts only

Apply the whole modifier stack up to and including that one on the curve or surface control points, instead of their tessellated geometry.

Note

By default, curves, texts and surfaces are always converted to mesh-like geometry before that the modifier stack is evaluated on them.

Extras

• Apply Ctrl-A

  Makes the modifier “real”: converts the object’s geometry to match the applied modifier’s results, and deletes the modifier.

  When applying a modifier to an object that shares Object Data between multiple objects, the object must first be made a Single User which can be performed by confirming the pop-up message.

  Warning

  Applying a modifier that is not first in the stack will ignore the stack order (it will be applied as if it was the first one), and may produce undesired results.

• Apply as Shape Key

  Stores the result of that modifier in a new relative shape key and then deletes the modifier from the modifier stack. This is only available with modifiers that do not affect the topology (typically, Deform modifiers only).

  Note

  Even though it should work with any geometry type that supports shape keys, currently it will only work with meshes.

  Save as Shape Key

  Stores the result of that modifier in a new relative shape key and keeps the modifier in the modifier stack. This is only available with modifiers that do not affect the topology (typically, Deform modifiers only).

• Duplicate Shift-D

  Creates a duplicate of the modifier just below current one in the stack.

• Copy to Selected

  Copies the modifier from the Active object to all selected objects.

• Move to First/Last

  Moves the modifier to the first or last position in the modifier stack.

• Pin to Last

  Keeps the modifier at the end of the modifier stack. When a modifier is pinned, a pin icon will be displayed on the right side of the panel’s header.

  Move to Nodes

  Converts the existing Geometry Nodes Modifier node tree to a group node to be reused in other node trees. See Move to Nodes Operator for more information.

  This operator is only available for the Geometry Nodes Modifier.

Delete X, Delete

Delete the modifier.

Move ::::

Move the modifier up/down in the stack, changing the evaluation order of the modifiers.

A modifier is not movable if Pin to Last is enabled.

Below this header, all of the options unique to each modifier will be displayed.

Tip

Use Alt to affect all selected objects at once when performing operators such as add, apply, remove, and move to index.

See Multi-Object Editing for more information.

The Modifier Stack

Modifiers are a series of non-destructive operations which can be applied on top of an object’s geometry. You can be apply them in almost any order. This kind of functionality is often referred to as a “modifier stack” and is also found in several other 3D applications.

In a modifier stack, the order in which modifiers are applied has an effect on the result. Therefore the modifiers can be re-arranged by clicking the grab widget (::::) in the top right, and moving the selected modifier up or down. For example, the image below shows Subdivision Surface and Mirror modifiers that have switched places.

Modifier Stack example.

Modifiers are calculated from top to bottom in the stack. In this example, the desired result (on right) is achieved by first mirroring the object, and then calculating the subdivision surface.

Active Modifier

A modifier in the stack can be selected to mark in as Active, the active modifier displays an outline around the modifier’s panel. To set an active modifier, select an area of the modifier’s panel background, the modifier’s icon, or, select a modifier in the Outliner.

The active modifier is used by the Geometry Node Editor to determine which node group is being modified.

Example

Download example file.