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buttons. The icon of the button displays the current state: Project: HiCAD Parametrics
HCM models of 3-D assemblies and also of sketches are displayed in the HCM in a similar way. Therefore, this topic describes both cases, and points out the differences where required.
On the HCM tab of the ICN, all assigned HCM constraints of the current assembly / sketch will be displayed. Once assigned, these constraints can also be edited subsequently if desired.
The HCM tab provides a clear overview of all assigned positional and dimensional constraints. For assemblies, it also shows you how many degrees of freedom still exist.
The list of constraints can be structured in two ways: By constraints or by geometries. You can toggle between the two modes with the / buttons. The icon of the button displays the current state:
Sort by constraints
In this view, all constraints in this HCM model are listed on the first level. If you expand it, the geometries that are affected by this constraint are shown. If the option Group elements according to dimensional and positional constraints has been activated, the Positional constraints and Dimensional constraints will be shown as first level entries, and the corresponding constraints will be sorted beneath them.
Sort by geometries
In this view all parts / geometries that are affected by a constraint are listed at the first level. Parts that are not affected by constraints will not be listed here.
For assemblies, the degrees of freedom are displayed separately according to rotation and translation. If you expand a part entry, the constraints referring to this part will be listed. The parts here are colour-marked depending on their respective status:
Fixed parts obtain a yellow icon,
Fully defined parts obtain a green icon, 
All other parts show their normal (blue) icon. Right-clicking on a part opens a context menu, allowing you to fix or unfix the part.
Use the buttons 
to expand and collapse all entries in the list:
collapses all entries. expands all entries to the 2nd level. expands all entries. The 
button opens the Settings of the HCM display in the ICN.
At the bottom edge of the window the sum of all degrees of freedom in the current HCM model is displayed.
If you select a HCM constraint in the table, the points, planes or parts affected by the constraint will be highlighted in the model drawing. Double-clicking on a dimensional constraint opens the Edior for changing the value of the dimensional constraint. If you expand a HCM constraint and then click on a geometry, you can choose another geometry in the drawing that is to replace the first selected geometry in this constraint.
Special HCM constraints will be indicated by means of the following symbols:
identifies automatically created constraints.
identifies constraints containing external references.
Use the buttons 
to filter the shown constraints according to different aspects.
Select geometry: This filter shows only constraints that concern selected geometries. After choosing this filter, HiCAD will ask you to identify the desired geometry(-ies) in the drawing. Confirm by pressing the MMB. After this, only constraints concerning at least one of the selected geometries will be shown. Hide AutoConstraints (only in sketches): This filter hides all constraints that were created via the functions Automatic dimensional constraint and Automatic positional constraint. Constraints with external references (only in sketches): Shows only constraints containing external references. Constraints with issues: Shows only constraints with issues. Deactivated constraints: Shows all deactivated constraints. This concerns both HCM constraints that were deactivated manually, and constraints that were deactivated via a different constraint. If a filter is active, the corresponding button will be highlighted. Click on this button again to deactivate the filter. A filter will also be deactivated if you choose a different filter, i.e. only one filter can be active.
Errors can occur in HCM models: For instance, you can accidentally delete a part to which a constraint referred. In such cases, the constraint in the HCM window will be preserved, but will be marked as an incorrect in the ICN.
As long as this error exists, this constraint will not be considered. You can double-click on the incorrect relation (here"Point: Geometry does not exist"), and then identify a new point in the drawing to correct the constraint.
You can mark all constraints in the list in the ICN at once with the shortcut CTRL+A .
To delete marked constraints, you can use (besides the context menu function) the DEL key.
If you right-click in the HCM window, a context menu with various functions will be displayed. The range of function varies, depending on which part of the window you right-click.
All available functions are listed below; however, HiCAD will always offer only those functions that actually make sense in the current situation. For instance, it is not possible to change the orientation for a positional constraint of the type Fixing; therefore, this option will not be offered here.
If you hold down the SHIFT or CTRL key you can choose multiple constraints. If you right-click your multiple selection, only those context menu functions will be displayed that can actually be applied to this multiple selection. For instance, you can then apply a comment to both positional and dimensional constraints, or use the Zoom to constraint(s) function. But you cannot, for instance assign a new value to both a positional and a dimensional constraint, as a positional constraint has no value.
Delete: Deletes all positional and dimensional constraints in the current sketch/assembly. 
Edit formula: Opens a dialogue where you can enter a new value for the selected dimensional constraint. 
Change chirality: Changes the chirality of the selected constraint.
Change orientation: Changes the orientation of the selected constraint.
Simulation, via dimensional change: Creates a motion simulation based on the selected constraint.
Comment: Opens a dialogue window where you can enter a comment for the selected constraint.
Zoom to constraint(s): Zooms to the constraint(s) in such a way that it is completely visible on the screen. 
Always hide / 
Follow global visibility setttings: After selecting Always hide, the corresponding constraint will no longer be shown in the drawing. The function Follow global visibility settings will restore the original behaviour. Delete: Deletes the selected constraint. 
Deactivate / 
Activate: Deactivates/activates the selected constraint. 
Delete all constraints: Deletes all HCM constraint of the active assembly/sketch. 
Select new geometry: Allows you to choose a different geometry for the current constraint. Delete all constraints: Deletes all HCM constraints of the active assembly/sketch. Edit formula: Opens an Editor, where you can change the comment or value of the constraint. 
Copy text: Copies the current comment or formula to the clipboard. Delete all constraints: Deletes all HCM constraints of the active assembly of the active assembly/sketch. 
Fix / 
Unfix: Fixes the selected part, or unfixes it again. Delete all constraints: Löscht alle HCM-Bedingungen der aktiven Baugruppe / Skizze.
Constraints can also contain comments. These have no influence on the model drawing, but help to better understand the meaning and/or purpose of constraints.
You can assign a comment to a constraint in the following ways:
In the multi-column display of the ICN, the comment will be shown in the same-named column. Furthermore, you can expand each HCM entry, and will then find a Comment entra in the expanded structure.
HCM constraints can be deactivated. These constraints will then be completely ignored by HiCAD, but can be reactivated at any time if desired. This can be done as follows:
length > 50, which is always true (i.e. activates this constraint) if the variable length has a value greater than 50. The list also indicates which of the constraints are currently activated or deactivated:
Greyed out constraints (here: "Parallel" and "Fixing") have been deactivated manually. A crossed-out symbol for a constraint indicates that the constraint has been deactivated dynamically by a formula.
Click on the symbol to open a dialogue window with setting options for the HCM display in the ICN.
The following options are available here:
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