[Avizo 3D / Amira 3D]
Context
Users of Amira or Avizo may need to inspect scalar or vector data fields by sampling values along a straight line which can be placed arbitrarily. This is particularly useful for quantitatively examining how a field (such as pressure, density, or intensity) varies along a specific direction or path.
Process
1. Attach an Ortho Slice and Line Probe module to your data.
2. In this example, we use Ortho Slice selection of YZ orientation. The line can be oriented in any direction and is not limited to the main axes.
3. Suggestion: In the Line Probe properties, open the Options drop-down menu for the Points parameter to hide the dragger (unchecked Show dragger) for easier point selection.
4. In the Line Probe properties:
- Set Points to 1 from the Points port.
- Make sure you are in Interact mode (arrow icon), not Trackball mode (hand icon).
- Position the cursor where to mark point 1, then click the middle mouse button to add it.
The line is defined by two control points (start and end), which you can set by typing coordinates or interactively moving them in the 3D Viewer.
5. Go back to the Line Probe properties, set Points to 2, position the cursor, and click the middle mouse button to add point 2.
6. Finally, plot the line by pressing the Show button in the Line Probe module. A new window opens displaying the results.
Alternatively, you can add the Plot to Viewer module to the Line Probe module to display the results in the same viewer for interactive visualization. The output represents the pixel intensity values (on that plane) along the defined line.
Related Links
For more information about the Line Probe and Plot in Viewer modules, refer to the User's Guide available under Help in Amira/Avizo.