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# The 3D Ball Tool

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## 3D ball overview

The 3D ball tool allows you to make a selection in the form of a spherical object in 3D space.
To use it, specify the radius in the Radius, px edit box, which defines the sphere's size. Larger radii result in larger selections.

The Eraser, x edit box modifies the eraser size multiplier. When holding `Ctrl` and using the eraser (`Ctrl` + ), the size of the eraser brush increases based on this value.

- MIB in brief: Manual segmentation tools

Note

The aspect ratio for the depth size of the 3D ball is defined by pixel dimensions.
See Dataset Parameters in Menu -> Dataset -> Parameters.

Selection modifiers

- None or Shift + : add 3D ball selection to the existing one.
- Ctrl + : remove 3D ball selection from the current selection layer.

## Presets

Use the following key shortcuts to define and restore presets

- `Shift`+`1`, `Shift`+`2`, `Shift`+`3` - store preset 1, 2, or 3 correspondingly
- `1`, `2`, `3` - restore preset 1, 2, or 3 correspondingly

Back to MIB | User interface | Panels | Segmentation