Added missing part for SoView2D

Author: sahehb

mevislab.github.io/content/tutorials/basicmechanisms/macromodules/soviewportregion.md

@@ -20,8 +20,7 @@ In this guide, we will show how to use the `SoViewportRegion` module to create c
 We will demonstrate how to: 
 * Divide the render area into multiple regions. 
 * Assign different content to each region. 
-* Use alternative methods, such as SoView2D, when applicable.
-
+* Use alternative methods, such as `SoView2D`, when applicable.
 
 ## Prepare your network
 
@@ -153,6 +152,27 @@ You will see that the orientation cube of the 3D viewer appears in the bottom ri
 
 ![Final Network](/images/tutorials/basicmechanics/E6_13.png "Final Network")
 
+## Alternative using `SoView2D`
+In case you want the same dataset to be visualized in multiple viewers, the module `SoView2D` already provides this functionality.
+
+![Initial SoView2D](/images/tutorials/basicmechanics/SoView2D_1.png "Initial SoView2D")
+
+Whenever you are using the `SoView2D` module to visualize a 2D dataset, you need to add a `View2DExtensions` module and for example a `SoRenderArea` module. Without the `View2DExtensions` module, interactions like scrolling through slices or changing the window and level settings will not be possible.
+
+By default, you will see your images in a single viewer the same way as if you use the `View2D` module. The *number of columns* is defined as *1* by default. If you now change the *Number of Slices* to something like *3*, you will see 3 viewers shown in 1 column. As we can only connect one dataset, this network cannot display multiple series at the same time.
+
+![Multiple slices in SoView2D](/images/tutorials/basicmechanics/SoView2D_2.png "Multiple slices in SoView2D")
+
+Changing the *number of columns* to *3* and the *Number of Slices* to *9* results in a 3 x 3 layout.
+
+![Multiple slices and columns in SoView2D](/images/tutorials/basicmechanics/SoView2D_3.png "Multiple slices and columns in SoView2D")
+
+By default, the module shows consecutive slices with a slice step size *1*. If you change this, you can define the size of the steps between the viewers. If the resulting slice does not exist in the dataset, the viewer remains empty. 
+
+![Not existing slices](/images/tutorials/basicmechanics/SoView2D_4.png "Not existing slices")
+
+You are also able to define a slab size. This means the depth of the slab. You can either use the blend mode *Maximum* or *Blend*.
+
 ## Exercise
 You can play around with the different `SoViewportRegion` modules to create your own layouts by setting the values a little different.