Editing the Stack

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You can copy, cut, and paste modifiers within an object’s stack, or into the stacks of other objects. Among other features, you can give modifiers explicit names to help you remember the intended effect.

To edit the stack:

Choose an item in the stack.
Right-click.

This displays the Modifier Stack right-click menu, which is briefly introduced in this topic.

Rearranging and Sharing Modifiers

To rearrange modifiers:

The easiest way to move a modifier to a different location in the stack is simply to drag it there. Alternatively, you can use the following cut/copy and paste procedure.

Choose one or more modifiers, right-click, and choose Copy or Cut.
Choose a new location in the list, right-click, and choose Paste. The paste occurs immediately above the new location.

To share modifiers with other objects:

Choose one or more modifiers, right-click, and choose Copy.
Select a different object or group of objects.
Choose a location in the new stack, right-click, and choose Paste.

You can also drag from the modifier stack display to an object in a viewport.

Tip: Select world-space and object-space modifiers separately. Cut, Copy, and Paste are disabled if both types are selected. If you try to paste a world-space modifier into the section for object-space types, the paste occurs at the top of the world-space section. The reverse is also true.

Unique and Instanced Modifiers

By default, pasted modifiers are unique: they lose all connection with the modifier from which they were copied. Compare with an instanced modifier, which is shared between two or more objects. Changing a parameter on an instanced modifier automatically changes the same parameter on the other instanced objects.

To create an instance of a modifier:

After copying or cutting the modifier, right-click and choose Paste Instanced.

In the stack, the name of an instanced modifier appears in italics.

Any instance of a modifier controls all other instances. Use this feature when you want a number of objects to take on the same feature.

For example, copying an instanced Bend modifier to a number of trees would make them all bend identically. Changing Bend parameters on any one tree would change the bend on all the others.

To remove the instancing from a modifier:

Select the instanced modifier and click Make Unique. This converts the modifier from instanced to unique.

Using Make Unique with Multiple Items

Assume you have a group of trees all sharing the same instanced Bend modifier. If you select two of them and click Make Unique, a message asks, "Do you want to make the selected objects unique with respect to each other?"

If you click Yes, the two trees become independent of one another. Each has a unique copy of the modifier and can be bent separately.
If you click No, the two trees continue to share the same instanced modifier, but separately from the instance in the original group. The two trees can be bent together.

See How Instanced Modifiers Work.

Collapsing the Stack

You can use Collapse All or Collapse To to collapse all or part, respectively, of an object's stack to an editable object that preserves the cumulative effect of the collapsed modifiers on the base object. You might choose to do this in these cases:

You’ve finished modifying an object and want to keep it as is.
You want to simplify a scene and save some memory.

Note: In most cases, collapsing all or part of the stack will save memory. However, collapsing some modifiers, such as Bevel, increases file size and memory use.

After you collapse an object’s stack, you can no longer parametrically adjust either its creation parameters or the individual modifiers affected by the collapse.

Collapsing the stack does not affect the object’s transforms; it affects world-space bindings only if you use Collapse To. Collapsing the stack does not save memory if the stack contains no modifiers.

Tip: Before you use either Collapse option, use File menu > Save Selected to preserve a copy of the original parametric object.

To collapse the stack:

Right-click the modifier stack display.
If modifiers have been applied to the object, choose Collapse To or Collapse All.

Collapse To—Collapses the stack, up to and including the chosen modifier, into an editable object. Modifiers on the stack above the chosen modifier are not affected, and you can still adjust them individually.

The resultant object type depends on the uppermost modifier that outputs a specific geometry type, if any. If the stack contains no such modifier, the result is an editable mesh. If the collapsed portion of the stack contains a modifier that outputs a specific geometry type, and no other such modifier is above it, the result is that type of object. For example, if the topmost such collapsed modifier is Edit Poly, the resultant object is Editable Poly.

Collapse All—Collapses the entire stack into an editable object, other than world-space bindings. Any world-space bindings on the stack are left intact.

The resulting stack list shows a single entry: Editable Mesh, unless any modifiers on the stack output a different type of geometry. For example, if the topmost such modifier is Edit Poly, the resultant object is Editable Poly.

If no modifiers are applied to the object, choose one of the Convert To options:
- Editable Mesh
- Editable Spline
- Editable Patch
- Editable Poly
- NURBS
Note: Depending on the object type, not all Convert To options might be available.