Http://vistools.npaci.edu/ Visualization Services Group Steve Cutchin – Manager Amit Chourasia –...

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http://vistools.npaci.edu/

Visualization Services Group

• Steve Cutchin – Manager

• Amit Chourasia – Visualization Scientist

• Alex DeCastro – Visualization Scientist

Overview of Tools

• Mesh Viewer – Interactive Volume Viewer

• Vista – Volume Renderer

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

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

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

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

Step 2: Load the header volume file into Mesh Viewer

• Using a standard file chooser

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

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

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

Step 4: Select a camera viewpoint

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)

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

Vista Volume Renderer

• Play rendered animation

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

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).

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

How to install?

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

• Unzip

• Configure (options pthreads,64 bits, etc)

• Make

You are ready to render

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

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

What Vista comes with?

Small library of

• Test volumes

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

• Camera files

Summary in snapshots

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

Change Background

Mapping control

minmax 30 70 minmax -25 125

minmax 0 99

Color Ramps

Skip zones

Default (no skip)

Skip in mid zone

Skip in both end zones

Skip in 3 zones

Overall Opacity Control

Default (top view)

Reduced Opacity (top view)

Custom Opacity Control

Default

Reduced opacity on left

Reduced opacity in middle

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)

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)

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

Viewing positions

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

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

Is Vista supported ?

• Online documentation

• User discussion forum

Future Directions

• Light support

• Text support

• Slicing volumes in arbitrary manner

• Super Sampling

• AMR

• Geometry ???

Video Clips

• ENZO

• Terashake Surface Rendering

• Terashake Volume Rendering (on going)

• Rupture Dynamics

Q’s and Discussion

Http://vistools.npaci.edu/ Visualization Services Group Steve Cutchin – Manager Amit Chourasia –...

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