http://vistools.npaci.edu/

Visualization Services Group

• Steve Cutchin – Manager

• Amit Chourasia – Visualization Scientist

• Alex DeCastro – Visualization Scientist

http://vistools.npaci.edu/

Overview of Tools

• Mesh Viewer – Interactive Volume Viewer

• Vista – Volume Renderer

http://vistools.npaci.edu/

What is Mesh Viewer?

• Interactive volume viewer

• Load and view volume data

• Apply color maps to scalar data

• Save camera viewpoints and paths

• Connect to Vista to render a volume

http://vistools.npaci.edu/

Steps to Use Mesh Viewer

1. Describe the volume dataset

2. Load the volume into Mesh Viewer

3. Select a color map and opacity transfer function

4. Select a camera viewpoint

5. Render the volume with Vista

http://vistools.npaci.edu/

Step 1: Describe the volume dataset

• Example volumes from the GEON group

• Volume files located at:– tg-login1:/gpfs/geon.e3d/0928164226.000/volume1.XXX0.3DSMPI

– 200 volume time steps: 001 to 200

• Volume format:– Resolution: 274 x 125 x 442 (slow to fast)– Voxels: scalar floating-point number– Min-max Range: -0.0001 to +0.0001– 36 byte header

http://vistools.npaci.edu/

Step 1: Describe the raw volume

• Use a header file to describe the volume

Datafile: C:/data/geon/volume1.0250.3DSMPI

Resolution: 274 125 442

VoxelType: SCALAR

FieldType: FLOAT

MinVal: -0.00001 (range of interest)

MaxVal: +0.00001

ByteOrder: LSB

SkipBytes: 36

http://vistools.npaci.edu/

Step 2: Load the header volume file into Mesh Viewer

• Using a standard file chooser

http://vistools.npaci.edu/

Step 3: Create a color map and opacity transfer function

• The default color map is VIBGYOR, reverse rainbow• Opacity transfer function is a V-shape, so that zero

values (green) are transparent

http://vistools.npaci.edu/

Step 3: Select a color map and opacity transfer function

• Blue to Red Color Map• Negative values are mapped to Blue• Positive values are mapped to Red

http://vistools.npaci.edu/

Save to Color Map File

• Blue to Red color map file:

# SDSC MeshViewer-Vista color map file

ColorMapKnots: 3

Knot: 0.0 0.0 0.0 1.0 (Blue)

Knot: 0.5 0.0 0.0 0.0

Knot: 1.0 1.0 0.0 0.0 (Red)

OpacityMapPoints: 3 (V-shape function)

Point: 0.0 1.0

Point: 0.5 0.0

Point: 1.0 1.0

http://vistools.npaci.edu/

Step 4: Select a camera viewpoint

http://vistools.npaci.edu/

Camera File

• Save viewpoint to camera file

# SDSC MeshViewer-Vista camera file

CameraWindow: -0.0414 0.0414 0.03105 -0.03105 (view frustum)

CameraClipping: 0.1 0.2 10.0 (near and far clipping planes)

CameraMatrix: -0.6989149439603387 0.011896984783295261 0.7151058403216444 0.0 -0.4173230704777921 -0.8187834937827949 -0.3942525144573973 0.0 0.5808264421977076 -0.5739791390478042 0.5772249058919149 0.0 0.9258084413238429 -0.8096295572294344 0.9728538996344641 1.0

(view matrix)

http://vistools.npaci.edu/

Step 5: Render the volume with Vista

• Run Vista on Teragrid– Copy the color map files and camera file to

the Teragrid machine and run Vista

• Connect to the Vista server– Transmit color map and camera viewpoint to

directly to Vista

http://vistools.npaci.edu/

Vista Volume Renderer

• Play rendered animation

http://vistools.npaci.edu/

Tools built on Scalable Visualization Toolkits (SVT)

1. Vista – Volume Renderer2. Compositing with z buffered images3. Mixing volumes (create multi-variables volumes,

magnitudes)4. Histogram for volumes5. Minmax probe in Volumes6. Create test Volumes7. Ppm to mesh8. Resample9. RGB to Scalar10. Mesh Convert11. Format Info

http://vistools.npaci.edu/

Vista

It is a multithreaded, platform independent, scalable and robust volume renderer.

It allows users to do volume rendering of datasets even those that exceed available memory (using out of core paging).

http://vistools.npaci.edu/

What Vista can do?

• Volume Render any size volume using out of core paging

• Large Image resolutions - any resolution possible

• Create walk through around data segments

• Handles 2D meshes

• IsoVoluming <->IsoSurfacing

http://vistools.npaci.edu/

How to install?

• Download http://vistools.npaci.edu/VISTA/VISTA.htm

• Unzip

• Configure (options pthreads,64 bits, etc)

• Make

You are ready to render

http://vistools.npaci.edu/

In’s and out’s for Vista?

Input – raw, volb, volc ,mpr, some hdf5

Output – ppm (rgb,rgb+az)

png( rgba,rgb+az) needs png libs

where z is depth information

http://vistools.npaci.edu/

How to run Vista?

• Run on Command line• Run as a server• Link as library with other tools• --help displays long list of options available

How to use vista?Three things required 1. Data2. Dimension 3. Range./vista --raw 100 100 100 --minmax 0 99 cube.raw

http://vistools.npaci.edu/

What Vista comes with?

Small library of

• Test volumes

• Transfer functions (Built in color ramps and opacity mapping)

• Camera files

http://vistools.npaci.edu/

Summary in snapshots

Default./vista --raw 100 100 100 --minmax 0 99 cube.raw

Change Background

http://vistools.npaci.edu/

Mapping control

minmax 30 70 minmax -25 125

minmax 0 99

http://vistools.npaci.edu/

Color Ramps

http://vistools.npaci.edu/

Skip zones

Default (no skip)

Skip in mid zone

Skip in both end zones

Skip in 3 zones

http://vistools.npaci.edu/

Overall Opacity Control

Default (top view)

Reduced Opacity (top view)

http://vistools.npaci.edu/

Custom Opacity Control

Default

Reduced opacity on left

Reduced opacity in middle

http://vistools.npaci.edu/

Custom Transfer Functions

ColorMapKnots: 3

Knot: 0.00 1.0 0.0 0.0 (red)

Knot: 50.0 0.0 1.0 0.0 (green)

Knot: 99.0 0.0 0.0 1.0 (blue)

http://vistools.npaci.edu/

Custom Transfer Functions

ColorMapKnots: 3 Knot: 0.00 1.0 0.0 0.0 Knot: 50.0 0.0 1.0 0.0 Knot: 99.0 0.0 0.0 1.0 OpacityMapPoints: 3 Point: 0.00 0.00 (no opacity)Point: 50.0 0.05 (high opacity)Point: 99.0 0.00 (no opacity)

http://vistools.npaci.edu/

Custom Transfer FunctionsColorMapKnots: 5 Knot: 0.00 1.0 0.0 0.0 Knot: 25.0 0.0 1.0 0.0 Knot: 50.0 0.0 0.0 1.0 Knot: 75.0 0.0 1.0 1.0 Knot: 99.0 1.0 0.0 1.0 OpacityMapPoints: 4 Point: 0.00 0.01 Point: 50.0 0.05 Point: 75.0 0.00 Point: 99.0 0.05

http://vistools.npaci.edu/

Viewing positions

Standard options for 6 orthographic views and spin on x, y and z and spiral

http://vistools.npaci.edu/

What about other viewing orientations?

• A small library of camera files are shipped with source

• Mesh Viewer can be used to generate camera paths

• Maya can be used for generating camera paths

http://vistools.npaci.edu/

Is Vista supported ?

• Online documentation

• User discussion forum

http://vistools.npaci.edu/

Future Directions

• Light support

• Text support

• Slicing volumes in arbitrary manner

• Super Sampling

• AMR

• Geometry ???

http://vistools.npaci.edu/

Video Clips

• ENZO

• Terashake Surface Rendering

• Terashake Volume Rendering (on going)

• Rupture Dynamics

http://vistools.npaci.edu/

Q’s and Discussion