envision lab lab.… · envision guided visualization •an easy-to-use web-based tool for remote...
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![Page 1: EnVision lab Lab.… · EnVision Guided Visualization •An easy-to-use web-based tool for remote scientific visualization •Available through the Longhorn Vis Portal •Developed](https://reader034.vdocuments.us/reader034/viewer/2022042919/5f618d478099dc703900565c/html5/thumbnails/1.jpg)
EnVision Lab
Aaron Birkland Cornell Center for Advanced Computing
Data Analysis on Ranger
January 2012
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EnVision Guided Visualization
• An easy-to-use web-based tool for remote scientific visualization
• Available through the Longhorn Vis Portal
• Developed at TACC – Funded in part by TeraGrid and the DoD PET program
– Development team: Greg Johnson, Steve Mock, Brandt Westing, Matthew Hanlon
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Run an EnVision session
1/20/2012
• Navigate to the “Jobs” tab
• End any currently running jobs
• Select the session type “EnVision guided visualization”
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Run an EnVision session
1/20/2012
• Load the mummy data in the remote file browser (click the Examples shortcut)
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Run an EnVision session
1/20/2012
• Click the Isosurface icon
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Run an EnVision session
1/20/2012
• Add an isosurface with default parameters
• Note that the default value is 127.5. This is the midpoint of our range of values. It will draw a surface over all points with that value.
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Run an EnVision session
1/20/2012
• See the visualization in the Rendering tab
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Run an EnVision session
1/20/2012
• Click the cutting plane icon in the toolbox.
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Run an EnVision session
1/20/2012
• Keep the default values; click Add
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Run an EnVision session
1/20/2012
• Click the hand next to the cutting plane under Added Algorithms; use the widget to interact
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Run an EnVision session
• Drag the arrow point(s). What do they do?
• Drag the ball in the center of the slice. What does that do? What are the limitations on its movement?
• Drag the frame surrounding the slice. What does that do?
• Click the hand to finalize.
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Run an EnVision session
1/20/2012
• Click the Eye next to each added visualization algorithm to hide
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Run an EnVision session
1/20/2012
• Click volume rendering icon in the toolbox
• The transfer function maps dataset values to colors or opacity
• Transfer function boxes are empty. Clicking or dragging the mouse pointer shapes this mapping
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Run an EnVision session
1/20/2012
• Manipulate the transfer function boxes until you get something that looks as shown.
• The dataset value range is implied by box width. As these boxes are for quick/easy/rough selection, they are not labelled with values.
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Run an EnVision session
1/20/2012
• The opacity and color transfer function emphasizes certain value ranges
• Enable/disable the isosurface and slice visualizations. Is there a correlation with the volume rendering?
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Run an EnVision session
1/20/2012
• Click volume rendering icon in lower left to try different transfer functions.
• Try different values for the isosurface visualization. These images are for values of 8.5, 64.6, 127.5, and 220. What is this showing? Why?
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Run an EnVision session
1/20/2012
• Explore the isotropic turbulence example data on your own
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