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## Thunderstorm Visualiztion

### ...about the visualization

Data describing a section of the atmosphere are imported. This particular section of the atmosphere shows a wide variation in moisture content, temperature, and wind velocity. Choose a variable in the "Data Selection" page, and then vary the isosurface value in order to see regions with common characteristics.

> ### ...about the visual program

> This visual program demonstrates the use of data-driven scalar and integer interactors. The integer interactor controls the slab position and is constrained by the size of the data sets.

> The Scalar interactor which chooses the isosurface value is also data-driven, so that it cannot exceed the range of the data values.

> ### ...about the conversion to web page

> The original visual program rendered an object and used the Collect tool to combine that with a color bar and a caption. The web version of the .net file, does not use Collect. Instead each part of the original image is separated into its own Image tool. The resulting pictures are then assembled in an html table giving the web page author greater flexibilty in layouting out the document and increasing the proportion of meaningful gif byte transmitted with each new image.

### ...about Enable Animation

This web page passes the following parameter to the applet which controls the Data Explorer sesssion: `

        < param name="CACHING_FEATURES" value="true">

` The applet has the built-in ability to cache images inside the browser. Normally this ability is used on behalf of Orbit mode and on behalf of operating Data Explorer's Sequencer. The html author can provide access to this caching function in his web page by setting CACHING_FEATURES. Then the end-user can enable caching by clicking the Enable Animation toggle and specifing a cache size. The applet will cache as many images as requested, allowing the user to play back a sequence by selecting Review in the Mode menu.

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