Remcom distributes a library of XF-compatible CTIA phantom models, including various left and right hand grips suitable for simulating a range of handheld devices. The hands are developed and distributed by CTIA–The Wireless Association (CTIA). Using an XFdtd-compatible version, users can position the hand with a mobile device in order to measure system efficiency and test standards compliance.
Obtain a CTIA Hand Model
CTIA distributes CTIA hands to its members only. Users who have a CTIA hand can then send it to Remcom in order to receive a posable version that is compatible with XF.
The XF-compatible CTIA hands are provided by Remcom as a CTIA-XF7-Library file to be saved in a user-defined location. The file contains the available phantom hand models, a smartphone spacer, and their associated materials.
Add to XF's Libraries
The CTIA-XF7-Library file must be added to XF's collection of reusable objects and definitions, which are referred to as libraries, before the CTIA hand can be used in a project. To do this, users can click the Libraries button on the right side of XF, then click the link button at the top of the window to select the CTIA-XF7-Library from its saved location. The file appears in the available libraries listed in the upper-left portion of the window with its parts listed below.
The Filters on the right side of the window specify which of the selected library's objects appear in the lower portion of the window. For example, selecting the CTIA-XF7-Library and filtering by Parts displays the hand phantom models below.
Add to the Project
Once the CTIA-XF7-Library file is added to XF's libraries it is available for use in any project. Users can add objects to the current project by clicking in the libraries window and dragging to the project tree.
Add the CTIA hand to the project tree with the following steps:
- On the right side of XF, click the Libraries button to open the Libraries window.
- In the Libraries section of the window, select the CTIA-XF7-Library.
- In the Filters section of the window, select Parts.
- In the lower portion of the window, select the desired CTIA hand grip and drag it to the Parts branch of the Project Tree.
The Material Assignments dialog opens, displaying all material definitions associated with the selected CTIA hand that do not already exist in the Materials node of the Project Tree. The Source column names the materials that have not been added to the project, and the Destination column lists objects to which the corresponding materials could be assigned. The default Copy Source selection copies the destination object originally associated with each material. Adding these materials is recommended in order to maintain the electromagnetic properties of the original model.
- Use the drop-down arrow to select a Destination for each Source listed in the Material Assignments editor.
- Click OK to add the hands and materials to the project.
- Close the Libraries window.
The CTIA hand appears as an assembly in the Parts branch of the Project Tree and its associated materials appear in the Definitions branch, each of which expands to show its contents. The model is now included in the project and users can inspect and edit the assembly as with other XF geometry.
Reposition the Hand
Once a CTIA hand is in the project, it must be aligned with the phone. The hand can be repositioned to match the location of a device by right-clicking on the CTIA hand in the Project Tree, and selecting Modify ❯ Specify Orientation to open the editor.
Users can match the hand assembly to the device by aligning the spacer with the phone:
- In the Specify Orientation editor, select Align Directions from the Alignment Tools drop-down menu.
- In the Geometry window, click on the normal of the spacer's face.
- Click on the normal of the device's face.
- Select Align Directions from the Alignment Tools drop-down menu.
- Click on the spacer's vertical edge.
- Click on the device's vertical display edge.
- Click on the local coordinate arrows and drag it to the device's location.
- Click Done to close the editor.
Manipulate the Fingers and Thumb
Users can position the fingers and thumb individually by right-clicking on the CTIA hand in the Project Tree, and selecting Edit CTIA Grip to open the Editing CTIA Grip controls.
The grip editor contains a pair of buttons for each of the fingers and thumb:
- Release: loosens the grip of the associated finger by moving it away from the device.
- Grasp: tightens the grip of the associated finger by moving it toward the device.
- Default: returns each finger and thumb to its original position.
The fingers and thumb can also be moved simultaneously toward the same object by clicking on the desired object in the Geometry window. This activates the editor's Automatic settings that adjust the entire grip.
For example, clicking on the device moves the fingers and thumb until they are grasping the phone once the Automatic settings are applied:
- Grasp: moves the fingers and thumb until each one comes in contact with the selected object.
- Reset on Fail: moves the fingers and thumb back to their last position if they are unable to contact the selected object. This option is checked by default.
The following video begins by adding the CTIA hands to XF's available libraries, and the workflow is applicable only after users have received a CTIA-XF7-Library file from Remcom. The demonstration utilizes XF's editing options to reposition a CTIA hand and manipulate its fingers and thumb.