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You visualize reconstructed motion capture data in the 3D Workspace, including:

  • Trajectories/Markers
  • Force plates
  • Segments
  • 3D meshes
  • Sticks
  • Virtual points
  • 3D Workspace tags

The focal point representation and floor help you orient yourself and manipulate perspectives by panning, tilting, orbiting, zooming, and more. This "camera view" enables you to move about in the 3D Workspace and see the object from many different angles.

For more information, see:

Work with meshes

A mesh is a 3D image that is "wrapped" over subject segments to provide a more realistic visualization of the subject. You don't have to use a mesh, but it can provide an interesting and/or more realistic of the subject or segments.

Apply a mesh to an entire subject

  1. Open the trial in the 3D Workspace.
  2. If the Attributes window is not already displayed, press F9 to display it.
  3. Click any segment to see the Display Set group in the Attributes window.
  4. In the Display Set group, click the arrow next to Segment Style and from the drop-down menu, select Mesh. (If you select Box, Diamond, or Truncated Cone, no mesh file can be used.)
  5. In the Display Set group, next to Mesh File, click the arrow and select a mesh file from the drop-down menu.
    The mesh is applied to the subject.

Apply a mesh to a single segment

  1. Open the trial in the 3D Workspace.
  2. If the Attributes window is not already displayed, press F9 to display it.
  3. Click the segment you want to change to select it and view the Segment group in the Attributes window.

    To select multiple segments, hold down the left mouse button while clicking each segment.

  4. In the Segment group, click the arrow next to Segment Style and from the drop-down menu, select Mesh.
  5. Click the arrow next to Mesh Segment and select a segment from the drop-down menu.
    The mesh is applied to the segment(s).

Adjust a mesh

The Mesh Adjust tools allow you to edit and adjust Polygon subject mesh files to make them fit your subject in a more visually realistic manner. Changes to a mesh can be saved in an individual report as a hyperlink or as a new mesh file that can be used with any reports.

When you adjust meshes, the Red, Green, and Blue handles translate/scale/rotate along the X, Y and Z component of the mesh.

When you use Scale mode, the Pink handle scales all three components at once.

Polygon provides three Mesh Adjust tools:

  • Position: Enables you to move the position of the segment mesh relative to the subject's markers/segment.
  • Scale: Enables you to override Polygon's automatic scaling rules to make the segment look more visually realistic. Change the relative size of the segment mesh to the segment markers.
  • Rotate: Enables you to align the orientation of a mesh's segment to the segment markers.

Add 3D Workspace tags

You can attach a 3D tag to any 3D entity within the workspace.

To add a 3D tag to a 3D entity in the workspace:

  1. In the 3D Workspace, select the entity to be tagged (segment, trajectory, force plate, etc).
  2. On the 3D ribbon, click the required tag button (Arrow TagCrosshair Tag, or Outline Tag).
  3. In the Attributes bar, edit the Title and/or the Display text and any other attributes of the tag as required.

Practice displaying data in the 3D Workspace

Part 1

  1. Open a 3D workspace pane using the Bones options under Display Sets or the Skeleton. Create a link.
  2. Use the left and right mouse buttons to rotate and translate the space.
  3. Add a skeletal mesh to the figure. Create a link.
  4. Change the color of the entire display set. Create a link.
  5. Change the color of a single segment. Create a link.
  6. Customize the mesh. Create a link.
  7. Attach a camera. Create a link.
  8. Track a segment. Create a link
  9. Trace a segment. Create a link.
  10. Show a trajectory. Create a link.
  11. Save your report.

Part 2

  1. Display just the force plate with force vectors and butterflies. Create a link.
  2. Create a global link that will display the data actively looping.
  3. Use replay loops to display only one cycle of data. Create a link.
  4. Set the Workspace View title. Create a link.

Part 3

  1. Open a report that has at least two trials of processed data. If you do not have a suitable report, create a report with at least two trials.
  2. Open a Workspace pane with the modeled segments from one of the trials. Add a skeletal mesh and change the color of the skeleton. Select two segments and plot the angle between them.
  3. Bring a second figure into the space. Apply a skeletal mesh and change the color.
  4. Adjust the position of the two subjects so that they are walking in the same direction.
  5. Using the information features of Polygon, verify that you have one context from each subject displayed in the time bar. Ensure these contexts are the same, ie, two lefts or two rights.

    You can select the context by changing the Display Set context.

  6. Select one time bar and right-click on the other. Select synchronize n to n (i.e. left to left or right to right). Here you can also synchronize by selecting a segment from one trial and a segment on the second trial while holding down the Ctrl button and then using the context (right-click) menu and choosing Synchronize. Are the images synchronized?
  7. If necessary, re-position the figures.

Part 4

  1. Add a new context called Swing.
  2. Add new events to Swing so that the cycles go from Foot Off to Foot Off. Mark one foot contact during this new cycle.
  3. Change the normalization so that the cycle is normalized from Foot Off to Foot Off.
  4. Change the time bar scale.
  5. Change the seconds to frames.
  6. Add Toggle Replay loops. Create a link.

Part 5

  1. Under Normalization Info, create a new scheme called Swing.
  2. Alter the events to this scheme so that the cycles go from Foot Off to Foot Contact. Make the Next Cycle Stance. Change the context colors.
  3. Add a second scheme called Stance and alter the events so that the cycles go from Foot Contact to Foot Off and make the next cycle Swing. Change the context colors.
  4. Close the dialog box.
  5. Normalize the events in the time bar for the left to Swing.
  6. Make sure that the time bar colors have changed and that the events are now marked Stance and Swing.
  7. Change the color of the skeleton to Context Color and make sure that the skeleton changes color accordingly through the gait cycle.