Selection and Cleanup

Select a splat in the Scene Manager before editing it. Gaussian selection and cleanup operations apply only to that active splat, even when several splats are visible.

Edit Modes

SuperSplat functions in one of two edit modes:

• Centers Mode
• Rings Mode

These modes affect how selections work and what you see in the viewport.

Centers Mode

In centers mode:

• Gaussians are overlaid with a blue dot at their center.
• Selections apply to all Gaussian centers independent of their screen depth.
• Centers are colored depending on their selection state. By default, blue is used for unselected Gaussians and yellow for selected Gaussians.
• You can control the size that centers are rendered in the SETTINGS panel.

Rings Mode

In rings mode:

• Gaussians are overlaid with a ring at their outer boundary.
• Selections apply to the top-most layer of gaussian rings only.
• Selected Gaussians are colored yellow (by default).

Disabling the Overlay

The mode overlay can be disabled entirely (by pressing Tab), so neither dots nor rings are displayed.

However, please note that the selection behavior is still determined by the active mode.

Selection Tools

Each Scene Manager row represents an imported splat, while the selection tools act on individual Gaussians within the active splat. Use these eight tools to crop a splat or remove unwanted Gaussians:

Tool	Description
Picker Select	Click to select a single Gaussian, or click + drag to create a rectangular selection area. This is the default selection tool.
Lasso Select	Click and drag to draw a freeform shape. Gaussians within the shape's outline will be selected. This is a 2D screen-space selection tool.
Polygon Select	Click to place points that define the vertices of a polygon. Press Backspace or Delete to remove the last placed point. Close the shape by clicking the first point, double-clicking, or pressing Enter. Gaussians within the polygon will be selected. This is useful for precise selections with straight edges.
Brush Select	Click and drag to paint a selection using a circular brush. Adjust the brush size with the [ (decrease) and ] (increase) keys. Ideal for organic selection work.
Flood Select	Click on the viewport to generate a 2D selection mask based on a flood fill algorithm. A threshold slider (0-1) controls the sensitivity of the flood fill. This tool is particularly useful for selecting and deleting stray Gaussians (also known as floaters) that appear isolated in the scene.
Eyedropper Select	Click on the viewport to select Gaussians based on color similarity. A threshold slider (0-1) controls the sensitivity of the color matching. This tool is useful for selecting groups of Gaussians that share similar colors.
Sphere Select	Creates a 3D spherical volume for volumetric selection. Double-click anywhere in the scene to position the sphere center. Move and Scale buttons in the toolbar (or the 1 and 3 keys) switch the sphere's gizmo — dragging the scale gizmo's center handle changes the radius — or enter its Position (X, Y, Z) and Radius numerically. Click Set, Add, Remove, or Intersect to apply the volume to the current selection.
Box Select	Creates a 3D box for volumetric selection. Double-click anywhere in the scene to position the box center. Move, Rotate, and Scale buttons in the toolbar (or the 1, 2, and 3 keys) switch the box's gizmo, so the box can be freely positioned, rotated, and resized — or enter its Position (X, Y, Z) and Size (X, Y, Z) numerically. While the rotate gizmo is active, the Size fields are replaced by Rotation fields (enter 0, 0, 0 to reset the orientation). Click Set, Add, Remove, or Intersect to apply the volume to the current selection. This is ideal for selecting Gaussians within a specific region of 3D space.

Selection Modifiers

The 2D selection tools support modifier keys to control how the selection is applied:

Modifier	Action
None	Replace the current selection with the new selection
Shift	Add to the current selection
Ctrl	Remove from the current selection
Shift + Ctrl	Keep only Gaussians that are in both the current selection and the new selection

Intersect is available with Picker, Lasso, Polygon, Brush, and Flood Select. Eyedropper Select supports Set, Add, and Remove, but not Intersect.

While Picker, Lasso, Polygon, Brush, or Flood Select is active, the cursor shows which operation the current modifier keys will apply. A plain crosshair means Set; a badge on the crosshair indicates Add (+), Remove (−), or Intersect (∩). The same feedback appears when selecting a value range in the Splat Data panel.

The 3D selection tools (Sphere Select and Box Select) have Set, Add, Remove, and Intersect buttons in their toolbar instead of using modifier keys. Their volumes are transformed with the same gizmos as the transform tools: clicking the active gizmo mode button again hides the gizmo, the gizmo follows the local/world coordinate-space toggle, and volume edits are undoable while the tool is active.

Lock, Delete, and Restore

Use Select > Lock or press H to lock the selected Gaussians. Locking clears the selection and prevents those Gaussians from being selected or deleted. This is useful for protecting a finished area while you clean nearby geometry. Choose Select > Unlock or press Shift + H to unlock all locked Gaussians in the active splat.

Delete selected Gaussians with Select > Delete, Delete, or Backspace. Deletion is non-destructive while you edit: use Undo to reverse the latest deletion, or choose Select > Reset to restore all deleted Gaussians in the active splat. Reset does not unlock locked Gaussians.

Lock, unlock, delete, and reset operations are recorded in the edit history. Removing an entire row from the Scene Manager is different and cannot be undone.

Duplicate and Separate a Selection

When a Gaussian selection exists, the Edit menu provides two ways to turn it into another splat:

• Duplicate copies the selected Gaussians into a new splat and keeps the originals unchanged.
• Separate creates a new splat from the selected Gaussians and deletes them from the original splat.

Both operations can be undone and are useful for giving one region its own transform, visibility, or Color settings.

Cleanup Recipes

Remove Floaters

1. Switch to Rings mode so selection stops at the topmost visible surface.
2. Use Flood Select for an isolated patch, or Lasso, Brush, Sphere, or Box Select for a larger region.
3. Rotate the camera and add to or remove from the selection until the intended geometry is isolated.
4. Press Delete or Backspace.
5. Inspect the result from several angles and use Undo if too much was removed.

Crop a Splat

1. Select the region you want to keep with Box, Sphere, Lasso, or Polygon Select.
2. Choose Select > Invert.
3. Delete the inverted selection.
4. Export the cleaned result, or save an .ssproj if you want to preserve the splat and project setup.

Protect Finished Areas

Select a finished region and press H to lock it. Continue cleaning the remaining selectable Gaussians, then press Shift + H when you need to edit the protected region again.

For attribute-driven cleanup, use the Splat Data panel to select ranges such as low opacity or extreme scale values.

Next Step

Continue to Transform, Measure and Align to transform selected Gaussians or whole splats, calibrate scale, align captures and merge visible splats.