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


Leave a comment

Comments will be approved before showing up.


Also in NOVEDGE Blog

Autodesk Solutions for Remote Work
Autodesk Solutions for Remote Work

March 23, 2020 1 min read

Working together we'll be able to come out the other side of this challenging time and be back to business as usual.

In the meantime, the whole staff at NOVEDGE is here to help you.

Read More
ARCHline.XP, the Gateway to BIM We All Need
ARCHline.XP, the Gateway to BIM We All Need

March 18, 2020 4 min read

Perfect for Architects, Interior Designers, Decorators, Product and Furniture Designers, and Home Staging Professionals. ARCHLine.XP is the BIM tool we all need.
Read More
Introducing 2Shapes a powerhouse for Jewelry Designers never seen before!
Introducing 2Shapes a powerhouse for Jewelry Designers never seen before!

March 11, 2020 4 min read

2Shapes, is a product that solves most (if not all) issues I found frustrating in the past. The aim of 2Shapes is to transform the way jewelry is sold by turning customers, salespeople and manufacturing managers into co-designers, and having them involved in the process.
Read More

Subscribe