Tool: Map Eraser

Map Eraser allows interactively erasing (zeroing) parts of volume data such as density maps. It is implemented as the command volume erase. The command (but not tool) has the further capability of setting the “erased” parts to values other than zero. See also: Segment Map, volume operations

Map Eraser can be started from the Volume Data section of the Tools menu or by clicking the map eraser icon in the Right Mouse toolbar. The tool window can be moved, resized, etc.

Only one volume data set can be displayed for erasing to occur. If the data set was opened from a file, a copy of the display region will be opened automatically as a new model and the original hidden so that erasures apply only to the copy.

• Show map eraser sphere – whether to display the eraser sphere (a surface model, default semitransparent ). The sphere can be moved with the button assigned to the map eraser mouse mode. Combining the assigned button with Shift moves the sphere in Z: dragging down moves it toward the viewer, up away from the viewer.
• Radius – sphere radius; can be adjusted by entering a value or moving the slider.

Erase inside sphere zeroes the sphere-enclosed portion of the data, whereas Erase outside sphere zeroes all but the sphere-enclosed portion. Reduce map bounds crops the map to the minimal box containing the sphere.

Data can be erased even when hidden by clipping or zoning (with surface zone or volume zone).

The modified map can be saved to a file.

The eraser sphere is not saved in sessions.