Prefab World Builder Is a Unity3D editor extension that makes level design and prop placement much faster and easier. It is available on the Unity Asset Store.
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Changelog

Prefab World Builder 2.4.1 2022 - June - 30
Changes
  • [Changed] Brush picker shortcut.
Fixes
  • [Fixed] Issue causing a crash when adding a brush from a prefab with monobehaviours with circular references in their requirements.
Prefab World Builder 2.4 2022 - June - 2
Features
  • [Added] Functionality to allow selecting a parent object before categorizing by palette, tool or brush.
  • [Added] Customizable shortcut to close all windows.
  • [Added] Functionality to edit control points of several lines at the same time.
Fixes
  • [Fixed] Issue that called Awake on palette objects when entering play mode.
  • [Fixed] Selection tool issue when snapping to grid.
  • [Fixed] Lag issue after deleting a line or a shape.

Prefab World Builder 2.3.1 2022 - May - 12
Fixes
  • [Fixed] Line spacing issue with constant spacing values.
  • [Fixed] Pin tool issue causing long pause after flattening terrain.
  • [Fixed] Yellow screen issue when placing particle systems.

Prefab World Builder 2.3 2022 - May - 6
Features
  • [Added] Shortcut to select next palette.
Changes
  • [Improved] Pin tool rotation. Rotation now does not reset after releasing an object and rotating it again.
Fixes
  • [Fixed] Pin tool issue mistakenly placing items when rotating the scene.

Prefab World Builder 2.2 2022 - May - 4
Features
  • [Added] Shortcut to pin tool to snap rotation when rotating freely.
  • [Added] Preference value to change pin rotation step size.
Fixes
  • [Fixed] Intermittent freeze issue.

Prefab World Builder 2.1 2022 - May - 3
Features
  • [Added] Preference value to change the size of control points.
Fixes
  • [Fixed] Conflict in pin tool between the shortcut to change the distance from surface and the shortcut to rotate around x-axis.

Prefab World Builder 2.0 2022 - May - 2
Features
  • [Added] Edit mode to shape tool.
  • [Added] Pin tool shortcuts to rotate around X and Z axes.
  • [Added] Functionality to add new brushes using the picker.
  • [Added] Shortcuts for toggle the grid, the snapping and the grid lock.
  • [Added] Shortcuts to set grid cell size, grid origin and grid rotation to match the selected object.
  • [Added] Shortcut to select the parent object of splines and shapes.
Changes
  • [Improved] Brush picker shortcut. Now, to pick the brush from an object on the scene, simply hold down B and click on the object you want to select.
  • [Changed] Escape behavior. Now when you press Esc, it doesn't ask to save the changes.
  • [Improved] Extrude properties. Now it doesn't reset the tool handle after editing properties.
Fixes
  • [Fixed] Lag issues in all tools.
  • [Fixed] Problem saving line data after editing lines.

Prefab World Builder 1.9 2022 - March - 2
Features
  • [Added] Selection Filters to selection tool.
  • [Added] Overwrite brush properties settings to replacer tool.
Fixes
  • [Fixed] Issue in tool overlays when changing tools.
  • [Fixed] Replacer tool issue ignoring the rotation defined in brush properties.
  • [Fixed] Preview flickering issue.

Prefab World Builder 1.8.1 2022 - February - 23
Changes
  • [Changed] Organization of directories to make it easier to create assembly definitions.
  • [Added] Popup list to preferences window to choose what action to take on unsaved changes: Ask to save, save or discard.
Fixes
  • [Fixed] Issue in tool overlays not displaying unsaved changes dialog when changing tools.

Prefab World Builder 1.8 2022 - February - 21
Features
  • [Added] Message box to ask whether to save unsaved changes or not.
  • [Added] checkbox to line and shape settings to place objects parallel to the surface.
  • [Added] more options to create subparents.
Changes
  • [Improved] Some shortcuts to avoid collisions with other editor shortcuts.

Prefab World Builder 1.7 2022 - February - 9
Features
  • [Added] Persistent line data.
  • [Added] Randomness slider to brush and gravity tools.
  • [Added] Preferences window.
Fixes
  • [Fixed] Gravity tool issue with complex meshes.
  • [Fixed] Misplacement issue in replacer tool.
  • [Fixed] Negative gap issue in line tool.

Prefab World Builder 1.6 2022 - January - 14
Features
  • [Added] Option to eraser tool to allow erasing only the closest object.
  • [Added] Option to replacer tool to allow replacing only the closest object.
  • [Added] Vertex snapping to terrain corners to selection tool.
  • [Added] Functionality to create a multi-brush from a selection of brushes.
Fixes
  • [Fixed] Issue with snapping and selection tool.
  • [Fixed] Duplicate brush thumbnail issue.

Prefab World Builder 1.5.3 2022 - January - 3
Fixes
  • [Fixed] Undo issue in unity 2021.2.

Prefab World Builder 1.5.2 2021 - November - 29
Fixes
  • [Fixed] Issue with tool profiles not being saved.

Prefab World Builder 1.5.1 2021 - November - 21
Fixes
  • [Fixed] Issue changing unity version causing data loss from palettes and tools.
  • [Fixed] Issues with missing prefabs.
  • [Fixed] defect in the previous/next buttons of thumbnail editor.

Prefab World Builder 1.5 2021 - November - 17
Features
  • [Added] Terrain flattening functionality to pin tool.

Prefab World Builder 1.4.1 2021 - November - 9
Fixes
  • [Fixed] Issues with overlay panels in Unity 2021.2.

Prefab World Builder 1.4 2021 - November - 4
Features
  • [Added] Thumbnail editor.
  • [Added] Tools overlay panels in the scene view window. (Unity 2021.2 or higher)

Prefab World Builder 1.3 2021 - October - 19
Features
  • [Added] "Replace All Selected" button to Replace tool properties.
  • [Added] "Embed Pivot Height" toggle button to brush properties.
  • [Added] Functionality to overwrite brush properties to tools properties window.
  • [Added] Documentation button to toolbar.
  • [Added] "Create sub-parent per prefab" toggle button to tool properties.
  • [Added] Rotation handle to shape tool.
Changes
  • [Improved] shortcuts. Now you can place objects (left click) without having to release modifier keys (shift, ctrl).
Fixes
  • [Fixed] Issue with negative spaces in the shape tool.
  • [Fixed] Problem with the initial axis direction in shape tool.

Prefab World Builder 1.2.1 2021 - October - 11
  • [Fixed] Palette flickering issue.

Prefab World Builder 1.2 2021 - October - 6
Features
  • [Added] Line midpoint hint.
  • [Added] Brush picker.
  • [Added] Gravity shortcut to edit height.
  • [Added] Radius slider to brush, gravity and eraser tool properties.
  • [Added] Outermost prefab filter toggle to eraser and replacer tools properties.
  • [Added] Default icon for brushes with empty prefabs or no renderer.
  • [Added] Alternative shortcut to edit tool radius (Shift + Hold right mouse button + Move mouse horizontally)
Changes
  • [Improved] Range fields. Now the range between the two values is used without specifying which value is the minimum or maximum.
  • [Changed] Default shortcuts for tools to improve the usability on mac devices.
Fixes
  • [Fixed] Toggle rotate to surface in selection properties.
  • [Fixed] Pin tool issue. Scale and rotation values were reset after painting an object.
  • [Fixed] bug that prevented drawing on terrain.
  • [Fixed] Issues with empty prefabs and no renderer.
  • [Fixed] Grid spacing issue.
  • [Fixed] Issue when changing the value of the Pattern in multi-brush.
  • [Fixed] Shape tool issue ignoring the brush scale multiplier.
  • [Fixed] Replacer tool bug when replacing children of prefab instances.
  • [Fixed] Preview of the eraser tool on the children of prefab instances.
  • [Fixed] Gravity tool issue causing objects to float in midair.

Prefab World Builder 1.1 2021 - October - 1
Features
  • [Added] Radial Grid.
  • [Added] Functionality to merge brushes.
  • [Added] Functionality to embed objects in the surface while moving the selection.
  • [Added] Functionality to embed objects in the surface to Mirror and Extrude tools.
  • [Added] A toggle to the brush tool properties to randomize or not the positions within the brush area.
  • [Added] A shortcut to the brush and gravity tools to rotate the brush area.
  • [Added] Square shape to the brush and gravity tools.
  • [Added] Gravity simulation animation.
  • [Added] Replacer Tool.
Fixes
  • [Fixed] Issue when selecting multiple line points.
  • [Fixed] Pin tool issue when enabling paint on grid and embed in surface.
  • [Fixed] Selection controls not updating after moving to another selection control.
  • [Fixed] Tile rotation issues.
  • [Fixed] Brush tool issue when undoing tool property changes.
  • [Fixed] Gravity tool issue where two objects were instantiated on the first brushstroke instead of one.

Prefab World Builder 1.0 2021 - September - 29