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=編輯=

在從掃描儀採集一些資訊後，可能需要清除不需要的數據或噪點，或者從網格中删除一些不想要的部分。

= 選擇資料 =

首先選擇要删除的影像的一部分.'''選擇工具列''' 能使用在兩種資料, 採集與網格, 而 '''選擇離群值''' 只能用在採集.

== 選擇工具列 ==

選擇工具列是互動的工具，可以在三維視圖中按住左鍵拖動滑鼠形成一個形狀，所有在其邊界內的資料將被選中。

這些工具是:

* '''矩形''': 先點擊一個點,然後拖動滑鼠變大;選擇好放開左鍵
* '''橢圓''' : 先點擊橢圓圓心,然後拖動滑鼠變大;選擇好放開左鍵
* '''多邊形''' :  點擊在兩個不同的點來畫線和第三點點創建一個多邊形。按兩下關閉該多邊形，並選擇在其邊界內的所有區域
* '''自由封閉線''' : 點擊並按住滑鼠左鍵開始跟隨滑鼠線繪製，釋放滑鼠左鍵以封閉該線，並選擇其邊框內的所有區域
* '''自由開放線''' : 點擊並按住滑鼠左鍵開始跟隨滑鼠線繪製，釋放滑鼠左鍵選擇所有恰好在畫線下方的數據
* '''線段''' : 點擊並按住滑鼠左鍵繪製線段，釋放滑鼠左鍵選擇所有恰好在畫線下方的數據

[[File:Dental_2_5_selectionTools.gif]]

=== 取消選擇 ===

While using one of the tools, hold {{Inline button|Key ctrl.png}} to unselect data instead of selecting it.

=== Pass-Through Selection ===

The ''Pass through selection'', changes the behaviour of the selection and only works on meshes data.

Normally all the data inside the drawn area will be selected, even if not visible or hidden behind other mesh surfaces.

By holding  {{Inline button|Key shift.png}} when finalizing the selection, only the visible part of the mesh will be selected. All the hidden parts, or the parts on the other side of the object, will not be selected.

== Outlier Cleaning ==

''Outliers'' are all the points of an acquisition that are not part of the object surface, such as noises, reflections or acquisition defects.

Each acquisition strategy already applies a specific outlier cleaning process. Therefore, data is often ready to be aligned and converted in mesh directly after the acquisition.

In order to remove outliers manually, use one of the three ''Select Outliers'' tools.

=== Select Outliers ===

This tool identifies all the points that are ''isolated'', far from all the other points. Click on this tool button to open a window containing two parameters

* Selectivity : how many points have to be near each other to consider them either isolated or not. The higher the value, the more points get selected
* Strength : how close two points have to be to consider them as not isolated. The higher the value, the more points get selected

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

=== Select Outliers by Angle ===

This Outliers selection provides only one parameter: an angle. A point is considered an outlier only if there are no points near it that create an angle smaller than the one established by the parameters. The smaller the angle, the less points selected. 

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

=== Select Outliers Segmentation ===

This Outliers selection tool analyses 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, which controls the height value. All the points below the chosen 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 either from the 3D View Context Menu, from the Edit Menu or using the related keyboard shortcuts:

* Delete Selection (DEL) : deletes the currently selected data
* Crop Selection ({{Inline button|Key ctrl.png}}+ K) : keeps only the selected data and removes all the rest
* Invert Selection ({{Inline button|Key ctrl.png}}+ I) : selects all the data that is not selected and deselects the selected data
* Clear Selection ({{Inline button|Key ctrl.png}}+ C) : deselects all the data
* Select All ({{Inline button|Key ctrl.png}}+ {{Inline button|Key shift.png}}+ C) : selects all the data
* Select Connected ({{Inline button|Key alt.png}}+ {{Inline button|Key shift.png}}+ D) : (only for meshes) extends the selection to get all the parts connected to the current selection area
* Dilate Selection ({{Inline button|Key ctrl.png}}+ D) : extends the selection to the data adjacent to the actual selection
* Erode Selection ({{Inline button|Key ctrl.png}}+ {{Inline button|Key shift.png}}+ D) : reduces the margins of the selection 

{{Navigation|Man_Acquisition|Man_Align}}