Again, this can be simplified as d1 = 0.5d2.īased on the discussion above, parametric modeling is also known as procedural modeling, history-based parametric modeling, or unidirectional modeling. Given the hole must remain centered even if the length is changed, the following relation must be stipulated, d1 (distance of the center of the hole from one edge) should be equal to half d2. This time, however, the designer must specify the relationship between the center of the hole and dimension d2. Next, the hole must then be placed on the sketch profile, as shown in figure 1c. To capture this design intent, the engineer must create a sketch profile of the block (figure 1b) with dimension d2 as the design variable. A designer wants the hole in the block shown (figure 1a) to remain centered even when the length of the block changes. To better understand how parametric modeling works, let us consider figure 1 above. How Parametric Modeling Worksįigure 1: Parametric Modeling Example ( source) Instead, they think about features, like faces and edges, that correspond to the model’s physical entities. In fact, design professionals rarely think along the lines of these primitives whenever they are creating a part.
Dealing with these primitives is less desirable, especially when designing complex parts. You see, a conventional 3D model comprises primitive geometric entities such as curves and points and solid primitives such as cylinders, cones, spheres, boxes, and wedges. This paradigm is sometimes also known as feature-based parametric modeling.
Relations within the sketch profile (sketch relations).Parametric relationship between dimensions.The relationship between the base block (unmodified block or parent) and any newly introduced entity (child), also known as a parent-child relationship.Generally, the design intent in parametric modeling is captured by: After all, all the dimensions have a predefined relationship. Thus, the entire model will be automatically modified or rebuilt whenever one or more dimension values are changed. Parametric modeling is a design paradigm that involves stipulating dimensions that define the geometry of a part and subsequently establishing and outlining the relations between the dimensions both across and within the part. Which Modeling Method is Right for You?.How do Parametric Modeling and Direct Modeling Compare?.
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