Geometric and Parametric Continuity _Alias Courses

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Have you ever heard of the terms parametric and geometric continuity?

Perhaps even used them interchangeably?

Whilst they are similar concepts, there is a difference. and I will show you that difference.

Take this door mirror,

The two surfaces with the darker yellow shade are overbuilt and trimmed back and fillet (blend) surfaces eat away even more of it. notice the boundary locator is green at curvature continuity (C symbol) which indicates we have G2 geometric continuity. this is what we care about most of the time. Now notice the cv’s (the red X’s) and you will see there is a kink at the join, the way the cv’s of two surfaces line up with each-other is called parametric continuity and here we have only C0 parametric continuity or position.

This is something that can be analyzed and discussed

Is this ok?

is it desirable? does it mean the surface structure (cv distribution) is too strained? this is up to the modeler to decide depending on every situation?

Just know the difference; that it exists and what it is.

Happy modeling!

Kevin De Smet Advanced Automotive student and contributor to (Volvo Cars)

To Learn Alias Automotive to Industry entry level has been made easier. Why not visit my website and take a look for your self?

My New Website is now live!

I am a top flight Alias Trainer/Modeler, specializing in taking students who are either currently studying or who have left college/university and want to learn the skills they need to reach Alias Automotive Entry Level. I offer the best value Alias training deal out there!

Special Winter Discount Package

Courses in order of cost:

“Course #1”.6 months Website Access

6 Months website access to all video tutorials, 167 Euros one-off payment (228 USD equivalent Nov.2011)

Courses, including reviews and coaching:

“Course #2A” Private Tuition Package

167 Euros per month (228 USD equivalent Nov.2011)
(Your work will be reviewed every 15 days and you will receive : feedback, instruction, tips and advice from me personally, modeling demonstrations from me on your .wire and I will supply Meshes to help you with difficult areas of your model).

“Course #2E” Economy Private Tuition Package

100 Euros (135 USD equivalent Nov.2011) per month. You get your .wire reviewed by me every 15 days and you will receive : feedback, instruction, tips and advice from me personally. Access to all website videos

“Course #3”.  Fast Track Full Pro. “One to One” Course

250 Euros (USD. 339 approx. Nov. 2011) per month. One to One Private tuition with weekly reviews of your .wire. You will receive specific geometry and meshes and modeling from me personally where required, to help you to complete your exteriors quickly to an Industry entry level standard. This means a bigger investment, but once in an Alias modeling job you will get back what you invested many times over and be able to work anywhere in the world

For more info,

Just register on my website and I’ll send you all the details


If you are in the USA, just register and login, then go to Profile and you can pay your subscription with your US credit card. Absolutely no extra charges for currency conversion.


Graham Bullock B.Ed.(CNAA)Des.Tech.

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