What are the two ways of parametric modeling?

There are two main approaches to parametric modeling: Direct parametric: Use numeric values ​​and expressions to directly define model geometric parameters (dimensions, equations, feature operations). Geometric constraint parameterization: Define model shape and behavior using geometric constraints (dimensions, parallelism, coplanarity, coincidence) to create models that are flexible and automatically respond to design changes.

Two ways of parametric modeling

1. Direct parameterization

Direct parameterization is a method of directly manipulating the geometric parameters of a model, using numerical values ​​and expressions to define the shape and dimensions of the model. The following are common methods of direct parameterization:

• Dimension parameterization: Use numerical parameters to define dimensions such as length, width, and height in the model.
• Equation Parameterization: Use mathematical equations to define the shape and surfaces of your model, such as using Bezier curves or non-uniform rational B-splines (NURBS) surfaces.
• Styling feature parameterization: Create models using feature operations such as extrusion, rotation, and sweep, which are controlled by parameters.

2. Geometric constraints parameterization

Geometric constraints parameterization uses geometric constraints to define the shape and behavior of the model. These constraints can be equations or inequalities. . Common types of geometric constraints include:

• Dimensional constraints: Define a specific distance, angle, or ratio between two geometric features.
• Parallel constraints: Define two geometric features to be parallel.
• Coplanar constraints: Define two geometric features to be coplanar.
• Coincident constraints: Define the coincidence of two geometric features.

By using geometric constraints, you can create more flexible parametric models that automatically respond to design changes, reducing rework and errors.

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