Why Direct/Parametric Modeling Hybrid is an Oxymoron

May 01, 2008 2 min read

Parametric CAD systems are based on a complex internal data-structure that represents each geometrical and dimensional constraint as a relationship among two or more entities. When the end-user requests a change to a parameter (dimension), the CAD system propagates the modification to the entire 3D model (it’s called model evaluation) following those relationships while preserving the validity of each single constraint.

In the data structure of a direct-modeling CAD system there are no constraints. They are created on the fly as a way to support high-level modification of the 3D model. For example, if the CAD system sees a tangency between a planar face and a cylindrical face it likely will assume that it’s a constraint and that it should be preserved to guarantee that the behavior of the system follows the original design intent.

The power and beauty of the direct-modeling approach is that in different moments the set of active constraints can change radically. Constraints “captured” to support modification "A" can even contradict constraints “captured” during modification “B”. This is great because gives the end-user incredible flexibility and power.

On the other hand, in a parametric CAD system the set of constraints can be changed only with tedious and complex operations. The benefit of this more rigid approach is that your CAD system knows all the constraints and doesn’t have to guess them. This makes parametric CAD systems more predictable and reliables. If the 3D parametric model was carefully created by a skilled CAD user this can be a huge advantage.

Because of the intrinsic difference between the two approaches, there cannot be a hybrid CAD system where I can create a parametric part, change it using some of the flexible tools offered by a direct-modeling system, and still have a fully parametric part.  A direct-editing modification to a parametric model is possible, but it becomes a non-return point — the data structure that supports the parametric nature of the model will not survive.

The recent marketing brochures and blogs that are describing a possible future of CAD based on the hybrid approach make me smile. But we all know that marketing knows no limitations…

Franco Folini

Franco Folini
Franco Folini


Also in NOVEDGE Blog

Welcome to ZWCAD 2023:  The Ultimate 2D CAD Solution
Welcome to ZWCAD 2023: The Ultimate 2D CAD Solution

June 10, 2022 2 min read

Changes in the new ZWCAD 2023 can be summarized as three keywords: efficient, user-friendly and connected. 
Read More
Chaos Phoenix 5 is Out: More Control, Better Simulations!
Chaos Phoenix 5 is Out: More Control, Better Simulations!

May 27, 2022 1 min read

Chaos Phoenix 5 takes active body simulations to the next level with new tools. New and enhanced presets make creating realistic dynamic effects faster and easier. 
Read More
New Advanced Renderer Built Into Rhino 7 Replaces Flamingo nXt
New Advanced Renderer Built Into Rhino 7 Replaces Flamingo nXt

May 20, 2022 1 min read

Flamingo is no longer available to buy or evaluate.
The great news is that Flamingo has been replaced by the new advanced renderer built into Rhino 7.

Read More

Subscribe