Master's Thesis - Studierstube Augmented Reality Project - Graz ...

5.2 iMEDgine extensions
• SoSFString shader_path: the path to a directory containing the shader files.
This is necessary since only iMEDgine initially knows where they are, Coin3D
does not. This directory is defined among others at the very first start of the
application and stored in a global ini-file.
• SoSFString scene_graph_path: the path to the scene-graph Open Inventor
script if the accessing view type is defined as script-able one.
5.2.3 User Interface Extensions
Figure 5.5 gives an overview of additional buttons and behaviors of the iMEDgine
framework. The following section (5.2.3.1) defines the xml-file format for the saving
and loading of view configurations. Finally section 5.2.3.2 outlines the implementation
details of the developted color gradient editor.
5.2.3.1 Exporting/Importing of View Parameter
The export of a current workspace and all set parameter, view points and modifications
is technically simple but powerful in routine. Even marking interesting features of the
dataset by simple saving the view best showing them enables a hypothetic operator
to explore and explain the data quickly. In general the most important configuration
parameters for each view are the position of the camera viewing the scene, possible seed
region positions and rotations, an optional defined color mapping gradient and several
additional view-specific values. Since the resulting configuration file of such a snapshot
is generated in XML (DOM), new view configurations can be scripted by hand. The
code in 5.2 shows for example the configuration exported from figure 5.5. To keep the
XML-code short no further manipulation have been applied after arranging the views.
Hence all of the parameters show default values except the camera positions and time
positions.
To simplify the behavior of iMEDgine directly after loading a dataset a default
xml view configuration is loaded for the first overview. This provides the possibility
to customize the dataset overview tab and enables a fast development of new datasets
with initial overviews meeting exactly their requirements.
Listing 5.2: A viewer configuration file exported from the view arrangement from figure
5.5. Only the camera positions and time positions were varied so most parameter show
default values. Note that not all parameter from the view parameter node 5.2.2.2 have
to be exported to restore a complete view configuration tab. The remaining ones can
be restored by using the here defined.
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