Data Editing

After acquiring some information from the scanner there might be need to clean the data from unwanted parts or from noises. Or the need to remove some unwanted parts of a mesh.

Selecting Data

To remove any part of the image first select it. Use the Selection Tools that work on both acquisition and meshes or use one of the Select Outliers functions that work only on acquisitions.

Selection Tools

The selection tools are interactive tools that can be used dragging the mouse on the 3D View with holding the left button of the mouse. A shape will appear following the mouse and all the information inside its borders will be selected. The tools are:

• Rectangular: Draws a rectangle that starts from the click point and grows following the mouse, the selection is performed releasing the left mouse button
• Elliptical : Draws an ellipses centered in the click point that grows following the mouse, the selection is performed releasing the left mouse button
• Polygonal : Click one time to create a point, every new click adds one point. From the third point it creates a polygon.Double click to close the polygon and select all the area inside its borders
• Free Closed Line : Click and hold the left mouse button to start drawing a line that follows the mouse. Release the left mouse button to close the line and select all the area inside its borders
• Free Open Line : Click and hold the left mouse button to start drawing a line that follows the mouse. Release the left mouse button to select all the data exatcly below the drawn line.
• Segment : Click and hold the left mouse button to start drawing a straight line between the click point and the current position of the mouse. Release the left mouse button to select all the data exatcly below the segment.

Unselect Data

Hold the CTRL key down to uselect data instead of selecting it.

Pass-Through Selection

The Pass through (CTRL+ALT+V) located in the 3D View Context Menu changes how the selection works only on meshes.

If this option is disabled only the visible part of the mesh will be selected by the selection tools. All that is hidden, or on the other side of the object will not be selected.

If the option is enabled all the data inside the selection tool shape will be selected, even if not visible or hidden behind other mesh surfaces.

Outlier Cleaning

With the name Outlier are identified all the points of an acquisition that are not part of the object surface. They can be noise, reflections on the object surfaces or acquisition artifacts.

The acquisition strategy used for every object already applies a specific outlier cleaning. Therefore most of the time the data will be already good to be aligned, converted in mesh directly after the acquisition.

To further remove other outliers use one of the three Select Outliers tools

Select Outlier

This is the most simple tool, it tries to identify all the points that are alone, far from all the other points. Click on this tool button to open a window containing two parameters

• Selectivity : How many points need to be close to tell if a point is alone or not. High value means more points selected
• Strength : How close two points need to be to be considered not alone. High value means more points selected

When changing the parameters the software will show the selection in real time. Click ok to confirm the selection.

Select Outlier by Angle

This tool works in a similar way to the Select Outlier tool, but only one parameter is porvided: an angle. A point is considered an outlier only if there are no point near him that create an angle smaller than the parameters. This means that a smaller angle in the parameter will mean more points selected.

When changing the parameters the software will show the selection in real time. Click ok to confirm the selection.

Select Outlier Segmentation

This tool works in the same way as the Select Outlier tool but analyzes blocks of points and not single points.

Base Selection

To remove the Base of the acquisition, the part of the acquisition near the model holder, use the Cut Height Acquisition Tool.

A slider will appear that controls a height value. All the points below that height will be selected.

When moving the slider the software will show the selection in real time. Click ok to confirm the selection.

Editing Functions

When a selection is performed use one of the following editing functions from the 3D View Context Menù, from the Edit Menù or with the appropriate keyboard shortcut:

• Delete Selection (DEL) : Removes the currently selected data
• Crop Selection (CTRL+K) : Keeps only the selected data and removes all the rest
• Invert Selection (CTRL + I) : Selects all the data that is not selected and deselects the selected data
• Clear Selection (CTRL + C) : Unselects all the data
• Select All (CTRL + SHIFT + C) : Selects all the data
• Select Connected (ALT + SHIFT + D) : Only for meshes, extends the selection to get all the connected parts to the curretion selection area
• Dilate Selection (CTRL + D) : Extends the selection a little bit to the data close to the actual selection
• Erode Selection (CTRL + SHIFT + D) : Reduce the selection a little bit from the margin of the actual selection

Now that you know how to select and clean Acquisitions and Meshes you can return to the Main Page or read about Data Alignment