CS 526 - Computer Graphics II -- Yiwen Sun
Project 2 ENDURANCE Viz
In this project I created a 3D visualization of some real data that was collected in December in Antarctica at Lake Bonney area.
The program was written in C# with VTK on WindowsXP system.
Data from the file endurance.csv
Temperature (C )
Daily progress of the mapping mission based on the scanning date infomation.
A satellite photograph of the lake: Bonney-12-6-08.jpg
Bathymetry of the site given as a set of 8-bit greyscale depth values in west-1262by584.raw
Visualization and Capabilities
- Data Filter
A 2D plot of value and number of points on that value is drawn. It can help to detect anomalies, like missing values, and set thresholds to filter out invalid values.
The GUI is developed based on ZedGraph APIs.
- Visualize Attribute Data as 3D glyphs
basic pipeline: vtkPolyData -> vtkMaskPoints -> vtkGlyph3D -> vtkPolyDataMapper -> vtkActor
The GUI on the Dataset panel allows user to select different dataset to view, change the depth scale, change the mask point ratio, and turn on / off cube axes.
User can turn on/off clipping planes, with options to clip dataset, bathymetry or both.
- Visualize Attribute Data as Volume (Actually it is a surface reconstruction)
basic pipeline: vtkPolyData -> vtkMaskPoints -> vtkDelaunay3D-> vtkUnstructuredGrid -> vtkDataSetMapper -> vtkActor
- Color Mapping
There are six predefined color mapping schemes (based on ColorBrewer recommended schemes), by default rainbow scheme is selected:
Sequential schemes are suitable for ordered data that progresses from low to high, like temperature.
Diverging schemes emphasis mid-range critical values and extremes at both ends of the data range, for example pH values .
Qualitative schemes are suitable for categorical data, for example daily progress of mapping mission.
Sequential scheme for temperatures. Diverging scheme for pH values. Qualitative scheme for daily progress.
- Visualize Isosurface Using Gaussian Splatting Method
basic pipeline: vtkPolyData -> vtkMaskPoints -> vtkGaussianSplatter -> vtkContourFilter -> vtkPolyDataMapper -> vtkActor
User can change the isosurface value, opacity and color.
Put Data Into Context
User can turn on/off the bathymetry
User can show / hide the satellite photograph on surface, change the opacity of the surface photo. Also change the background color of the view.
View 9 Attribute Datasets in Parallel Coordinates Plot
The data are colored using the color mapping scheme for the current selected dataset in main view.
Executable download. Please put all the data files in the same directory as the executable.
by Yiwen Sun