GSpawn - Level Designer

📧 Support: octamodius@yahoo.com | Forum

GSpawn is a powerful and intuitive level design plugin built directly for the Unity Editor.

Create modular environments, populate worlds, and iterate faster — all inside the Scene view.

🔗 Quick Links

🎥 Watch Trailer
🎥 Watch the Legacy Intro (Still Relevant)
📚 Read the Docs
🧰 Tutorial Series

🎬 Learn GSpawn

🚀 Get Started

🔹 Basic Workflow Tutorials

🎥 Small Library Tutorial
🎥 Tile Worlds Tutorial

🧱 Modular Building Tutorials

🎨 Decoration & Brush Tools

🎥 Decoration Rules
🎥 Scatter Brush Overview

🧩 Tile Rule System

🌟 Why GSpawn?

GSpawn removes friction from level design by combining powerful tools with a streamlined workflow.

Designed for indie developers, studios, and level artists who want speed, control, and flexibility.

🔧 Key Features of GSpawn – Level Designer

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🧱 Smart Modular Tools

• 3D Tile Rules – Intelligent tile placement with support for ramps and platforms
• Modular Wall Builder – Automatic structure detection (no manual naming required), corner handling, and pillar support
• Extrude Gizmo – Extend walls, floors, or tiles instantly
• Mirroring System – Mirror across up to 3 planes

🖱️ Placement & Editing

• Curve Spawning – Fences, roads, vegetation, and more
• Grid Snapping – XZ + vertical snapping, auto climb, cursor-aligned grid
• Props Placement – Alignment, embedding, randomization, offsets, scaling, rotation
• Scatter Brush – Density, slope filtering, alignment, spawn chance

🎮 Physics & Interaction

• Physics-Based Spawning – Real-time or instant placement
• Rotate & Scale – Direct manipulation via mouse or hotkeys
• Erase Tools – Precision removal using cursor or brushes

📦 Prefab & Scene Management

• Prefab Libraries – Search, filters, profiles, drag & drop
• Prefab Replacement – Swap instances instantly
• Object Groups – Organize scene elements efficiently

🧰 Advanced Tools

• Tile Tools – Segment & box spawn, terrain projection, overlap detection
• Selection Tools – Rectangle, box, and segment selection
• Transform Gizmos – Move, rotate, scale, universal
• Custom Shortcuts – Fully configurable hotkeys

🔍 Asset Disclaimer

The following asset packs were used in screenshots and videos and are not included:

Multistory Dungeons – Mana Station
Village Interiors Kit – 3DForge
KayKit - Dungeon Remastered Pack – Kay Lousberg
POLYGON Dungeons - Low Poly 3D Art by Synty – Synty Studios
Medieval Environment Pack – Manufactura K4
Fantastic Village Pack – Tidal Flask Studios
Voxel Blocks Pack – Tsunoa
Toon Forest Pack – Cat on the Roof

🤝 Support

Have questions or need help? Feel free to reach out.

Release Notes

GSpawn - Level Designer 3.6.0

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Bug Fixes:

Fixed no longer being able to change hotkeys from the Shortcuts window (double click wouldn't work and hotkey would not register).
Fixed tile rule spawning while orbiting the camera. Tile rules will no longer be painted when holding Alt (camera orbit).

Improvements:

Simplified Modular Wall system setup.
Manual naming is no longer required, pillar prefabs no longer need separate random profiles, and overall setup is now faster and easier.
Improved Modular Wall Prefab detection stability. Rebuilding the example prefab configuration now resets previously assigned prefabs to prevent incorrect data carryover when switching profiles.
Improved naming consistency across Modular Wall system. Refined field and property names to better reflect their purpose and improve overall clarity and maintainability.
Improved input handling stability (hotkeys & interactions). Attempted to fix rare cases where hotkeys would stop responding.

GSpawn - Level Designer 3.5.0

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Bug Fixes:

Fixed pillars not spawning when the same pillar prefab was used for both inner and outer corner middle with no tags.
Fixed edfitor windows dsiappearing when chaning scenes in playmode.

Improvements:

Removed restriction that only on GSpawn object must exist in the scene.

GSpawn - Level Designer 3.4.4

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Bug Fixes:

Fixed outline rendering exceptions.
Fixed tile rule grid bug which was preventing tiles from udpating correctly after undo/redo.

GSpawn - Level Designer 3.4.3

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Improvements:

Added Cell mode picker for Box and Segments object spawn modes.

GSpawn - Level Designer 3.4.2

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Bug Fixes:

Fixed circle brush projection on terrain mesh.
Fixed exceptions thrown when pressing mouse buttons 4 and 5.

Improvements:

No longer painting with brush when Alt is pressed.
Added rotation tooltip for modular snap session.

GSpawn - Level Designer 3.4.1

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Bug Fixes:

Fixed screen flicker bug on macOS.
Removed unnecessary 'using VisualScripting;' from scripts which was causing compiler errors in some cases.

GSpawn - Level Designer 3.4.0

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Features:

Implemented tile rule profile duplication.

Bug Fixes:

Fixed bug which was causing the tile rule erase brush to erase tiles from other grids.
Restored Generate Decor Rules button in the Prefab Lib DB Window.

GSpawn - Level Designer 3.3.9

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Improvements:

Tile rule bits are now automatically deactivated when clipped by the current neighbor radius.
Added TILE_RULE_GRID_RAMP_COUNTS_AS_NEIGHBOR in TileRuleGrid.cs to toggle ramps being counted as neighbors.

GSpawn - Level Designer 3.3.8

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Improvements:

Removed warnings in Unity 6.

Bug Fixes:

Fixed prefab preview border issues in Unity 6.

GSpawn - Level Designer 3.3.7

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Features:

Implemented selection position randomization.
Implemented selection rotation randomization.
Implemented selection scale randomization.

Improvements:

Improved curve spawn overlap checks when Avoid overlaps is checked. This allows overlap checks to be performed safely when curves are sitting on top of other objects.

Changes:

Changed plugin folder name to GSpawn - Level Designer (PRO).

Bug Fixes:

Fixed wall example prefab could no longer be assigned to a wall prefab profile.
Fixed wall prefab profile bugs when assigning wall example prefab.
Fixed min/max float fields not behaving correctly in certain situations.
Fixed prefab replacement being done when holding [ALT] and right click.
Fixed selection segments not selecting sprite objects.

GSpawn - Level Designer 3.3.6

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Features:

Implemented selection measure buttons in the Object Selection UI.

Improvements:

When highlighting prefabs in the prefab manager (default: [SHIFT + C]), the prefab search filter is now reset so that the prefabs can be highlighted accordingly.

Bug Fixes:

Fixed exception being thrown when an object group exists in multiple scenes.

GSpawn - Level Designer 3.3.5

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Improvements:

Selection append now only works with the Selection Rectangle and Click-Select. Selection Segments and Selection Box no longer support it. This was done because append is not very intuitive with these selection tools.
When highlighting prefabs in the prefab manager (default: [SHIFT + C]), the prefab library search filter is now reset so that the prefabs can be highlighted accordingly.

Bug Fixes:

Fixed extrude gizmo padding being reset to 0.01 for no good reason.
Fixed Selection Segments accidentally selecting child objects of prefabs instead of selecting the entire prefab.
Fixed selection gizmos not updating after a selection grow operation.

GSpawn - Level Designer 3.3.4

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[Improvement]: When highlighting prefabs in the prefab manager (default: [SHIFT + C]), all prefab libraries are now auto expanded.

[Bug Fix]: Fixed horizontal padding no longer being applied incorrectly when connecting segments in Segments Spawn.

[Bug Fix]: Fixed prefab lib pinned state showing in UI even if lib is not pinned.

[Bug Fix]: Fixed exception being thrown due to dangling references to destroyed prefabs (caused by PrefabTags enum field).

[Bug Fix]: Fixed example prefab rejected when wall piece names were manually setup.

GSpawn - Level Designer 3.3.3

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[Feature]: Added Pin button for prefab libraries.

[Improvement]: The Selection Segments tool now uses triangle precision when selecting objects.

GSpawn - Level Designer 3.3.2

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[Improvement]: The default grid opacity has been reduced, making it easier on the eyes when a small cell size is used.

[Improvement]: Searching by name in tree views (libraries, object groups etc) has been improved. Matches now also included items which are children of parents that are not expanded. Indenting is no longer applies when searching by name.

[Improvement]: Alignment highlight colors have been swapped to more accurately indicate the alignment axis.

[Improvement]: Alignment hints are now turned off by default.

[Bug Fix]: Fixed segments not being rotated correctly when using the Segments spawn tool.

GSpawn - Level Designer 3.3.1

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[Feature]: Automatic wall piece detection when using inner and outer corner pieces.

[Improvement]: Minor code changes and improvements.

[Improvement]: When creating prefabs from selected objects, prefab instances are preserved if possible.

[Improvement]: Eliminated requirement that wall prefabs should have 0 rotation.

[Improvement]: Added alternative wall piece names -> StraightToOuter/FirstStraight,

StraightToInner/LastStraight).

GSpawn - Level Designer 3.3