changed description (#137)

Author: sahehb

mevislab.github.io/content/examples/visualization/example4/index.md

@@ -5,7 +5,7 @@ category: "visualization"
 ---
 
 # Visualization Example 4: Display Images Converted to Open Inventor Scene Objects
-This example shows how to convert images to Open Inventor scene objects using the module `SoView2D` and modules based on `SoView2D`.
+This example shows how to convert a slice or slab of voxel images to 2D renderings on the screen using the module `SoView2D` and modules based on SoView2DExtension.
 ![Screenshot](examples/visualization/example4/image.png)
 
 # Download

mevislab.github.io/content/tutorials/visualization/visualizationexample4.md

@@ -18,7 +18,7 @@ menu:
 {{< youtube "WaD6zuvVNek" >}}
 
 ## Introduction
-In the previous example you learned how to use the module `SoView2DOverlay` together with a `View2D`. MeVisLab provides a whole family of `SoView2D*` modules (`SoView2DOverlay`, `SoView2DRectangle`, `SoView2DGrid`, ...). All these modules create or interact with scene objects and are based on the module `SoView2D`, which can convert a voxel image into a scene object. In this example, you will get to know some members of the `SoView2D` family.
+In the previous example you learned how to use the module `SoView2DOverlay` together with a `View2D`. MeVisLab provides a whole family of `SoView2D*` modules (`SoView2DOverlay`, `SoView2DRectangle`, `SoView2DGrid`, ...). These modules are derived from SoView2DExtension, which extends the SoView2D with specialized interaction and rendering. `SoView2D` itself renders a slice or a slab of a voxel image as a 2D image on the screen.
 
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