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3D Viewer: User FAQs
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01:58, 22 October 2019
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=== How to hide a slice ===
See [[#How to change the displayed slice]]
== 2D Surface Plots ==
=== What are surface plots? ===
A surface plot displays a 2D slice as a 3D plot: The x- and y-coordinate
correspond to the x- and y-coordinate in the 2D slice, the z-coordinate
is the pixel value at (x, y).
A 3D surface plot always shows one slice a time. When a 3D surface plot
is opened in the viewer, the currently selected slice is displayed. When
changing the slice of the original image stack, the view is automatically
=== How to change the color, transparency, ... of surface plots? ===
See [[#How to change the color, transparency... of a 3D object]]
=== How to interactively change the displayed slice? ===
A 3D surface plot always shows one slice a time. When a 3D surface plot is opened in the viewer, the currently selected slice is displayed. When changing the slice of the original image stack, the view is automatically updated. [[#top|Top]]
== View Settings ==
=== How to reset the view ===
See [[#How to reset the view]]
=== How to center a 3D object in the view ===
In case you have several 3D objects in the 3D window, it is desirable to center the view on one specific object. This is possible by selecting an object (by clicking on it) and click on ->View -> Center selected. [[#top|Top]]
=== How to hide the coordinate system ===
There are two types of coordinate systems, one global and one locally for each individual 3D object. To hide the local coordinate system of one specific 3D object, see [[#How to hide the coordinate system]]. To hide the global coordinate system, see [[#How to change general view settings]]. [[#top|Top]]
=== How to change the background color ===
see [[#How to change the background color]]
=== How to show a scalebar ===
To show or edit a scalebar to the 3D view, click on ->View->Edit scalebar. A dialog opens, which allows you to adjust scalebar settings:
* '''x position:''' The x coordinate of the scalebar in realworld coordinates.
* '''y position:''' The y coordinate of the scalebar in realworld coordinates.
* '''length:''' The length of the scalebar, also in realworld units.
* '''units:''' An additional string which is displayed together with the length.
* '''Color:''' The color of the scalebar.
* '''show:''' Check/Uncheck this box to show/hide the scalebar.
Clicking OK applies the changes. [[#top|Top]]
=== How to change the center of rotation of global rotations ===
See [[#How to change general view settings]]
=== How to change general view settings ===
Some general view settings can be changed and made permanent by clicking on ->View->View settings. A dialog window opens, asking the user for settings. There are two types of
settings, startup options and options which are applied immediately.
# Startup options:
#* '''Width and Height''' The window dimensions of the 3D viewer.
#* '''Show global coordinate system''' Show a coordinate system which indicates the origin of the 3D world.
#* '''Use current color as default background''' Activate this option to reload the current background color at each start of the viewer.
#* '''Show scalebar''' Activate this option to show the scalebar by default. (See also [[#How to show a scalebar]].
#* '''Apply changes now''' If activated, the changes in the settings above are immediately applied, otherwise, they are first applied at the next application start.
# Immediately applied options:
#* '''Show local coordinate system by default''' If activated, the local coordinate system of 3D objects is shown when new objects are loaded in the 3D viewer. If inactivated, the coordinate system is omitted. Note: This only affects newly added 3D objects. Already displayed objects are not affected.
#* '''Global rotation around Center/Origin''' Global rotations (see [[#How to interact with the viewer]]) can have two possible centers:
#** '''Origin:''' The origin of the virtual world. This is in most cases the lower left corner of 3D objects. You can make the origin visible by showing the global coordinate system (see above).
#** '''Center:''' The center of the virtual world. The center is automatically calculated from the displayed 3D objects.
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