# Introduction to 3D parametric modeling - Part I

**Hello everyone!**

Today and tomorrow I am going to tell you something about **3D parametric modeling**: I'll try to provide a simple and easy to understand definition for this modeling method and to define and analyze all the elements it is made up of.

In particular, I'll try to clearly answer the following questions:

- What is 3D parametric modeling?
- What are the features and why are they so important?
- What are parameters and what are they used for?

### What is 3D parametric modeling?

3D parametric modeling is a revolutionary approach to CAD/CAM; it is also referred as *“feature-based modeling”* because each solid body and/or surface is created through a series of subsequent modeling operations called *“features”*. Each feature contains and is controlled by particular *parameters*, mainly dimensions and relationships between parts. Many kinds of features exist, here are some examples: holes, fillets, shells, plus the four main 3D modeling operations - extrude, revolve, sweep and loft.

When modeling, what we see and work with are **shapes, solid bodies and surfaces**; what we don't immediately realize is that ** mathematics and equations are hidden behind every model and operation**. For example, when modeling a cylinder, we need to input - whether consciously or not - at list two measures: the first one is the diameter/radius of its basis, the second one is its height; so when dealing with a 3D model shaped as a cylinder, we know that it contains – somewhere – its mathematical information, in a nutshell: its

*parameters*.

*Parametric modeling* is a modern, flexible and innovative approach to 3D modeling, which **constantly guarantees the highest control of geometry attributes**. It's not the only 3D modeling method existing, but it's the best one if you work on architecture, design and/or engineering projects.

A good definition for 3D parametric modeling is the following:

3D parametric modeling is a modeling method which allows the creation of both solids and surfaces, relying on parameters and features.

So, what are exactly ** parameters** and

**?**

*features*I will answer this question tomorrow, so stay tuned for my next article!

Thanks everyone !

*Note: all images on this article were created by the author, the word cloud at the beginning was created with a free online tool (Wordclouds.com)*.

green77 (57)7 years agoGreat job. I like your post... Good introduction.

I am

Autodeskcertified forInventor(base and advanced) since 2009 and I perfecty know the argument ;)Which software do you use?

nawamy (54)7 years agoHello and thank you very much for your reply and appreciation!

I used to work with Inventor, since I've got the certification on that software as well (but not since 2009, I started studying it only in 2014 eheh!). Then, I started learning Fusion 360 and I actually love it. Do you use it?

Thank you again!

jholvherth (35)7 years agoVere interesting , looks like work on blender

nawamy (54)7 years agoHi and thank you!

I created the images with Fusion360 and Inkscape, actually!

For what I know Blender is a powerful tool but not for parametric modeling.

If you want to have a look at the softwares mainly used in the industry, I suggest you Autodesk Fusion360 and Inventor or Solidworks (even if there are more).

Thank you for your comment and appreciation. Good afternoon!

jholvherth (35)7 years agoNo problemo, and thnks for the data...Gday for u