7.8.11.2. Use mathematical function in sketch or feature algorithm?

It is often possible to create a sketch with or without using a feature algorithm [Attribute algorithm]. For example, you can perform a calculation directly in the sketch or assign it to a separate variable using a feature algorithm.

	Note
	You can use mathematical functions in the sketch. This functionality is saved in the 3db file. You can find an overview of all possible functions at Section 10.1, “PARTdesigner-Expressions ”. You can also use mathematical functions in the feature algorithm. This functionality is saved in the tab/tac file. You can find an overview of all possible functions at Section 7.8.12.7, “Mathematical functions (feature algorithm ) ”. The functional range of both options is similar, but not quite identical. The result in the 3D model is identical. Functions used in the sketch remain invisible to the outside. Functions used in attribute algorithms can be controlled via table.

Mathematical function in sketch ^[87]

If you only use variables without a feature algorithm, it is possible to create the sketch with the "Only in geometry [Only in geometry] " storage location [Save location] in the first step. You can tell from the color code that the variables H and L2 have been saved in the 3db file.

The circle radius should be twice the height of the rectangle. The calculation is performed directly in the sketch.

Radius: 2*H

Mathematical function in sketch

If necessary, you can save [Save location] later with "In geometry and table [In geometry and table] ". You can also use value range variables [Value range variables] and characteristic algorithms [Attribute algorithms] and create the table with the " In geomet [In geometry and table] ry and table" storage location [Save location].

Variables saved with storage location [Save location] "In geometry and table [In geometry and table] "

	Note
	Conclusion: With the "Only in geometry [Only in geometry] " storage location [Save location], you can easily access the 3D object. This procedure is ideal for simple components or for demo purposes.

Mathematical function in attribute algorithm ^[88]

The procedure is different if you use variables with a characteristic algorithm [Attribute algorithm]. The procedure using a characteristic algorithm will now be shown for the same component as above.

You start by creating the variables with the storage location [Save location] In table only [Only in table] or In geometry and table.

When creating the variables, select the option "Only in table [Only in table] " or "In geometry and table [In geometry and table] " under " Storage location [Save location] ". Fill in the fields and then click on "Apply [Commit] ".

You can see from the color code where the variables L2, H and R are saved. To create the table, it is sufficient to save with the "Only in table [Only in table] " storage location [Save location]. (color code ). The data is stored in the tab/tac file.

However, if variables are also to be used in the 3D model, they must be saved in both the 3db file and the tab/tac file. You can ensure that they are saved in the 3db AND tab/tac file by selecting a variable, selecting the "In geometry and table [In geometry and table] " storage location [Save location] and clicking Apply [Commit].

You can tell by the color code that the variables have been saved [Save location] with the storage location [Save location] "In geometry and table [In geometry and table] ".

For the mathematical operation R = 2*H (circle radius is 2x rectangle height), the variable R is created with the status [Status] "Feature algorithm [Attribute algorithm] ".

The algorithm is entered under Formula [Equation] and the Characteristic algorithm [Attribute algorithm] option under Status.

The variable R can now be used in the sketch for the parameter input of the circle radius.

Variable "R" with feature algorithm [Attribute algorithm]

Optionally, the variable [Variable] R can be displayed with the stored feature algorithm [Attribute algorithm] in the PARTdataManager can be displayed.

Click in PARTproject under Edit project -> General tab -> Variables section -> Order/groups of variables [Order/Groups of Variables] on the button ....

-> The same named dialog box opens.
Select the group of secondary variables [Secondary variables] on the left and move the variable R to the middle field. You can find details on this at Section 5.9.2.3.3, “ Variable groups - columns (variables) visible / hidden ”.
Finally, confirm with OK.

Open PARTdataManager.

The variable R is displayed in the table.

Note

Conclusion: To use feature algorithms [Attribute algorithms], work with the "In table only [Only in table] " or "In geometry and table [In geometry and table] " storage location [Save location]. However, you then have the option of controlling via the table.

With regard to the 3D model, the mathematical calculation could have been carried out in the sketch only (see above).

^[87]You can find a suitable example of this in the training catalog in the directory \v11_news\expression_in_sketch_or_algorithm\expression_in_sketch.prj.

^[88]You can find a suitable example of this in the training catalog in the directory \v11_news\expression_in_sketch_or_algorithm\expression_in_algorithm.prj.

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