ZBrush SubTool Management 1 — Questions and Answers

Question 1: What is a SubTool in ZBrush?

A type of sculpting brush
A separate mesh object within a single ZTool (Correct answer)
A layer inside a single mesh
A texture map channel

Correct answer: A separate mesh object within a single ZTool

SubTools are separate mesh objects stacked within a single ZTool, allowing you to sculpt complex characters made of multiple parts (body, clothing, accessories) while keeping them organized.

In ZBrush, a ZTool can contain multiple SubTools — each SubTool is an independent mesh. This lets artists work on complex scenes or characters where different pieces (skin, armor, hair) need separate sculpt passes, polypainting, or export. You can toggle visibility, lock, merge, or export each SubTool independently.

Question 2: Which SubTool palette button duplicates the active SubTool?

Append
Duplicate (Correct answer)
Insert
Clone

Correct answer: Duplicate

The Duplicate button in the SubTool palette creates an exact copy of the currently active SubTool and places it directly above it in the stack.

Duplicate is essential when you want to preserve a backup of a SubTool before destructive operations, or when you need symmetric variants. It copies geometry, polygroups, and polypainting. Unlike Append (which adds a new blank or imported mesh), Duplicate clones the existing active SubTool.

Question 3: What does the Merge Down button do in the SubTool palette?

Moves the SubTool one position lower in the stack
Merges the active SubTool with the one directly below it (Correct answer)
Deletes the SubTool below the active one
Combines all visible SubTools into one

Correct answer: Merges the active SubTool with the one directly below it

Merge Down combines the active SubTool with the SubTool immediately below it in the list, producing a single merged mesh.

Merge Down is a non-destructive way to consolidate two SubTools when you no longer need them separate. The resulting mesh inherits polygroups from both parts. If you need to merge ALL visible SubTools at once, use Merge Visible instead. Merge Down is useful for step-by-step consolidation during cleanup.

Question 4: What is the maximum number of SubTools allowed in a single ZTool in ZBrush 2023+?

100
500
1,000
There is no hard limit beyond available RAM (Correct answer)

Correct answer: There is no hard limit beyond available RAM

ZBrush 2023 and later versions removed the previous 1,000 SubTool cap. The practical limit is now determined by available system RAM and VRAM.

Earlier versions of ZBrush had a hard 1,000 SubTool limit. With ZBrush 2023, Pixologic removed that ceiling, making complex film/game assets with thousands of SubTools practical. Performance degrades gracefully with RAM consumption rather than hitting an arbitrary wall.

Question 5: Which SubTool operation would you use to bring in a mesh from a separate ZTool file?

Duplicate
Merge Visible
Append (Correct answer)
Extract

Correct answer: Append

Append opens a picker that lets you choose any ZTool stored in the Tool palette and adds it as a new SubTool in the active ZTool.

Append is the primary way to combine pieces from different ZTools into one. You can load a .ZTL file first (making it available in the Tool palette), then Append it. This workflow is standard when assembling character kits — body pieces sculpted separately are appended into a master ZTool for final presentation or export.

Question 6: What does the All Low button in the SubTool palette do?

Sets every SubTool to its lowest subdivision level (Correct answer)
Hides all SubTools
Collapses all SubTool folders
Applies the lowest resolution morph target

Correct answer: Sets every SubTool to its lowest subdivision level

All Low instantly switches every SubTool that has subdivision levels to its lowest (level 1) subdivision, which is useful for fast editing or rigging export.

When a ZTool contains many high-poly SubTools, navigating becomes slow. All Low drops every SubTool to subdivision level 1 for quick positional edits or export. Its counterpart All High restores them all to their highest stored subdivision. This workflow is essential for iterating on proportions without the viewport cost of millions of polygons.

ZBrush SubTool Management 1

What is a SubTool in ZBrush?