Feature Recognition (Pre-release)

Geometry Modeling > Create Actions > Feature Recognition (Pre-release)

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Feature Types

The Feature Recognition Tool support the following feature types:

• Circular Hole features.

• Transition features.

• Blends

• Chamfers

The Actions supported for features are: Recognize, Clear, Show, Delete, Edit

The Methods supported for features are: Automatic, Interactive

Feature Definition

The feature has the following attributes:

Name: string identifier, i.e., Hole 1

Parameters: the values defining the feature, i.e.,

• for holes the parameters are radius and depth

• for blends the parameters are radius1 and radius2

• for chamfers the parameters are height1 and height2

Id: the internal id used for storage

Label: the numeric value of the feature name; i.e., if the feature name is Hole 1, the label is 1.

Automatic Recognition

You select the solid list from which the features are to be recognized from the viewport and the corresponding features for which recognition was called is recognized. In case of transition features automatic recognition recognizes all the features with chaining.

Interactive Recognition

You can interactively pick the face (or edge for holes) list from the viewport and only those features which contain the selected faces (or edges for holes) are recognized. Single or compound/chain features can be recognized during interactive recognition.

Overview of the Feature Recognition Modules

The feature recognition technology integrated in Patran is centered around two modules:

Hole module. This module provides recognition of hole features in the input model. It recognizes circular features. It can recognize circular holes which may be blind or thru. Non-circular features like the rectangular holes, cannot be recognized with this module. Every hole feature has two associated attributes namely the radius, and depth. In case of blind holes both these attributes can be modified/edited, but in case of a thru hole only its radius can be modified/edited. During recognition phase the dependency relations between different hole features are also recognized. Subsequent operations on these features require satisfying these dependency relations. For example, if hole 2 is dependent upon hole 1 (parent child relation) then deletion of hole 1 will automatically result in deletion of hole 2. Similar relations apply for editing of dependent features.

Blend/Chamfer module. This module provides recognitions of transition features namely blend features and chamfer features. Two types of blends are recognized – constant radius blends and variable radius blends. Thus each blend has two attributes namely the maximum radius and minimum radius. However in case of constant radius blends the values of these two attributes are same. Similarly a chamfer feature has two attributes which are its slope heights. Transition features such as blends and chamfers are rarely isolated, and are usually connected to other blends/chamfers to form a blend/chamfer chain. Thus automatic recognition by default recognizes blends and chamfers with chaining, whereas, interactive recognition allows features to be recognized as a single feature or a compound or chain feature. Figure below shows a blend chain.

Limitations

Only one feature type per solid can be recognized and worked on at a time. For example, if you have recognized holes from one solid, then recognize blends on the same solid in the same Patran session, the feature modeler will replace the hole features with the newly recognized blend features for the solid. You can recognize holes for one solid and blends for another solid and the holes and blends will be stored in the feature modeler. All previous edits to the model by editing hole parameters or deleting holes will be saved however.

Solids whose geometry source is Parasolid is the only type supported for Feature Recognition.

Feature Recognition

Recognize Feature Hole Automatic

Recognizes circular features from the selected Solid. It can recognize circular holes that are blind or through. The dependency relations between different holes are also recognized.

Recognize Feature Hole Interactive

Recognizes circular features from the selected Solid Face or Edge . It can recognize circular holes that are blind or through. The dependency relations between different holes are also recognized.

Recognize Feature Blend Automatic

Recognizes transition features such as Blend features from the selected Solid. It can recognize constant radius and variable radius blends. The dependency relations between different blends are also recognized. Automatic recognition by default recognizes blends with chaining.

Recognize Feature Blend Interactive

Recognizes transition features such as Blend features from the selected Solid Face. It can recognize constant radius and variable radius blends. The dependency relations between different blends are also recognized.

Recognize Feature Chamfer Automatic

Recognizes transition features such as Chamfer features from the selected Solid. The dependency relations between different chamfers are also recognized.

Recognize Feature Chamfer Interactive

Recognizes transition features such as Chamfer features from the selected Solid Face. The dependency relations between different chamfers are also recognized.

Edit Hole Feature

Edit the Hole Feature Parameters. The radius and depth parameters for a blind hole or the radius of a through hole can be edited.

Edit Hole Feature

Edit the four selected holes by changing the radius values from 4 and 5 to 8.

Edit Hole Feature

The four selected hole radii changed from values from 4 and 5 to 8.

Edit Hole Feature using Radius Constraint

Edit the Hole Feature Parameters using a Radius Constraint. The radius and depth parameters for a blind hole or the radius of a through hole can be edited.edited.

Edit Hole Feature Using Radius Constraint

Edit the four selected holes by changing the radius values and depth from 3 and 15 to 5 and 5 respectively.

Edit Hole Feature Using Radius Constraint

The four selected holes radii and depths changed from 3 and 15 to 5 and 5 respectively.

Edit Blend Feature

Edit the Blend Feature Parameters. The radius R1 and radius R2 parameters for a Constant Radius or a Variable Radius blend can be edited.

Edit Blend Feature

Edit the four selected blends by changing the R1 and R2 radii from 4 and 4 to 3 and 6 respectively.

Edit Blend Feature

The four selected blends R1 and R2 radii changed from 4 and 4 to 3 and 6 respectively.

Edit Blend Feature using Radius Constraint

Edit the Blend Feature Parameters using a Radius Constraint. The radius R1 and Radius R2 parameters for a Constant Radius or Variable Radius Blend can be edited.

Edit Blend Feature Using Radius Constraint

Edit the four selected blends by changing the R1 and R2 radii from 5 and 5 to 10 and 10 respectively.

Edit Blend Feature Using Radius Constraint

The four selected blends R1 and R2 radii changed from 5 and 5 to 10 and 10 respectively.

Edit Chamfer Feature

Edit the Chamfer Feature Parameters. The height H1 and height H2 parameters for a chamfer can be edited.

Edit Chamfer Feature

Edit the three selected Chamfers by changing the H1 and H2 heights from 3 and 3 to 5 and 5 respectively.

Edit Chamfer Feature

The three selected Chamfers H1 and H2 heights changed from 3 and 3 to 5 and 5 respectively.

Edit Chamfer Feature using Height Constraint

Edit the Chamfer Feature Parameters using a Height Constraint. The height H1 and height H2 parameters for a chamfer can be edited.

Edit Chamfer Feature Using Height Constraint

Edit the three selected chamfers by changing the H1 and H2 heights from 2 and 2 to 4 and 4 respectively.

Edit Chamfer Feature Using Height Constraint

The three selected chamfers H1 and H2 heights changed from 2 and 2 to 4 and 4 respectively.

Edit Feature Parameters

The Edit Feature Parameters form allows the feature name and parameters to be displayed and modified for alteration of a model.

When a column of the spreadsheet is selected, the value is copied to the input databox for editing. Once the value is modified, press return to update the selected column with the new parameter definition. When all the desired parameter values are modified, press the OK button to save the changes.

If the Feature Name is changed and the same name is used for multiple feature names, the feature label will be appended to the input name. For example, if you entered “test” for the name of Hole 1 and Hole 2, then the resulting name for Hole 1 will be “test” and the name for Hole 2 will be test 2.

Show Hole Feature

Show the Hole Feature Parameters. The radius and depth parameters and the number of faces for each hole is displayed.

Show Hole Feature using Radius Constraint

Show the Hole Feature Parameters using a Radius Constraint. The radius and depth parameters and the number of faces for each hole is displayed.

Show Blend Feature

Show the Blend Feature Parameters. The radius R1 and radius R2 parameters and the number of faces for each blend is displayed.

Show Blend Feature using Radius Constraint

Show the Blend Feature Parameters using a Radius Constraint. The radius R1 and Radius R2 parameters and the number of faces for each blend is displayed.

Show Chamfer Feature

Show the Chamfer Feature Parameters. The height H1 and height H2 parameters and the number of faces for each chamfer is displayed.

Show Chamfer Feature using Height Constraint

Show the Chamfer Feature Parameters using a Height Constraint. The height H1 and Height H2 parameters and the number of faces for each chamfer is displayed.