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Defining a Feature Suppression Equation

You can use an equation to suppress and unsuppress a feature.
In the Add Equation dialog box, you use the Visual Basic IIf function to specify when to suppress or unsuppress a feature.

The syntax of the Visual Basic IIf function is:

iif(expression, truepart, falsepart)

where:
  • expression is the expression you want to evaluate
  • truepart is the value to use if expression is true
  • falsepart is the value to use if expression is false
  1. Open the Add Equation dialog box:
    1. Click Tools > Equations.
    2. In the Equations dialog box, click Add.
  2. In the FeatureManager design tree, click the feature you want to suppress and unsuppress.

    The feature name appears in the Add Equations dialog box.

    If Instant 3D is active, you need to click-pause-click the feature. The first click selects the feature. The second click adds it to the Add Equations dialog box.

  3. In the dialog box, complete the equation using the syntax of the Visual Basic IIf function. See examples below.

    You can type the entire equation or use the following tips to enter various pieces:
    • To insert a global variable, click it in the Equations folder in the FeatureManager design tree.
    • To insert a dimension name, click it in the graphics area.
    • To insert "suppressed" and "unsuppressed", click the suppress and unsuppress buttons in the dialog box.

  4. Click OK.

    The new equation is added to the Equations dialog box.

  5. Click OK to close the dialog box.

    To test the equation, change the value of the controlling parameter (the expression in the IIf statement). Then click Rebuild (Standard toolbar) and verify that the model changes as you intended.

Examples


  • This equation suppresses a linear pattern when the value of global variable "overall length" is less than 40.

    "LPattern1" = iif ("overall length"<40, "suppressed", "unsuppressed" )

  • This equation unsuppresses a rib feature when a particular dimension is greater than 100.

    "Rib1" = iif ("D3@Sketch1">100, "unsuppressed", "suppressed" )



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