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 www.learningalias.com/.co.uk (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?

www.learningalias.co.uk

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
www.learningalias.co.uk

USA:

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.

Regards

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

100% of donations go to provide food shelter and education for the abandoned Street Children of Nepal. Please give a few USD/Euro back. Why not do it right now by C.C. or Paypal? Charity credetials: BUDDHA MEMORIAL CHILDREN’S HOME TRUST. Registered Charity No: 1115373 . Thank you, graham bullock

Preview of the Advanced Surface Evaluation Techniques used in Alias Modeling

The Dynamic Section Control creates planes which we can toggle into True View (normal to plane)

The curvature combs clearly show that the student has G2 curvature, which is spec for this model,

but we can also see that the end of the mirror has G3 curvature. Note how well the Visual Curves describe the curvature conditions

We use the Evaluation Shader Princ. Max to view the consistency of the blends curvature. We have a plane for each xsec.

Viewing the xsects in True-View

Using the Multicolored shader with reflection on “Evaluation” to look for wobbles in the surfaces

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

www.learningalias.co.uk

Come an learn Alias or Boost your current Alias skills to FULL Pro. Automotive entry level

www.learningalias.co.uk

I am busier than ever these days

with contract modeling, teaching one to one students from all 5 continents and now of course my brand new website has gone live and it is possible to learn Alias Automotive to a professional level for the lowest rate on the planet.

Pictured below is an Audi A5 Sportback built by one of my students who is now a Digital Sculptor for GM.

Full HD video, just click the picture below

I am now putting some of my tutorials on YouTube, so whilst you’re there you may wish to check them out. There’s a full tutorial on how to create a Ball Corner to Class A Surfacing, Catia V5 spec.

Click Here for Videos

To see just how quickly you can learn Automotive Modeling, with a Pro. Alias Trainer to help you

NURBS FROM MESH VIDEO click here

For student’s who have the objective of finding a CAD job in the near future, I still teach One to One students and all of these students get Automotive Modeling or Design/Modeling jobs, so it’s a great investment to make.

Check-Out my Customer Feedback,

Many of my students make it to the top and succeed in becoming pro. Alias Digital Modelers. The hourly rate is very high and there are vacancies in UK. France, Germany, USA, Brazil etc.

On my website I teach you how to build the models you need to get accepted at interview. Why not take a look?
Info. on Courses:

“Course #1”.

6 Months website access to all website based video tutorials, 167 Euros (200 USD equivalent Nov.2011)

“Course #2”.

167 Euros (200 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 videos including my ” Private Student Training Videos”. You will build at least 3 complete automotive exteriors. The course also includes an intensive Reverse Engineering section, which required by most employers.

“Course #3”.

Fast Track Full Pro. “One to One” Course with weekly reviews and coaching 250 Euros (USD. 300 approx. Nov. 2011) per month. One to One Private tuition. 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
www.learningalias.co.uk

USA:

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.

Regards

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

>

WIP exploratory rendering

 Winter Tire -WIP

This student will be starting her first Automotive Alias Job soon.

She loves detailing and just to show-off she is modeling this Winter Tire. There are 2 more rows of tread still to be added at the edge of the tire.

Whereas most of us are mad about building good surfaces, there is always work for modelers who can create great detail like wheel rims and tires, mirrors badges, interior parts etc

She has also modeled a great A5s rim and when its all finished, I’ll ask her to make a final rendering for this site

I have just received these additional pics. 

In this rendering we can see that she has added the outer tread row,

which is beautifully modeled and gives a much more interesting form to the tire.

[I am currently working on a set of video tutorial to teach how to make a complete wheel and tire with real tread pattern].  This type of work can swing things in your favour at an interview. You will not be asked to model a tire tread in an Automotive studio, but it does really show off your skill-set and demonstrates that you have the patience it takes to produce a brilliant piece of detailed Alias modeling

This full tutorial will be available on my NEW website any day now

Here we see that the tread rows are symmetrical from LHS to RHS

(they are offset by half a tread block), so they cannot be represented with layer symmetry. Also note that she had modeled the tread with a 3º draft angle, so that it will release from the mould in production

I love this rendering the student has achieved perfect lighting (Alias Powercaster)

and texture and in addition to that she has got the specular overlay absolutely right. (I know that she did this on a Pentium 4, with 2Gb. RAM and a 50 Euro VGA). I was told that she used 11 lights and 4 distinct tire rubber shaders

Watch preview of Tire tutorial now. There are 3 videos in the main tutorial, which is available if you subscribe to my Alias Professional Training site:

Come an learn Alias or Boost your current Alias skills to FULL Pro. Automotive entry level

www.learningalias.co.uk

Pictured below is an Audi A5 Sportback built by one of my students who is now a Digital Sculptor for GM.

Full HD video, just click the picture below

I am now putting some of my tutorials on YouTube, so whilst you’re there you may wish to check them out. There’s a full tutorial on how to create a Ball Corner to Class A Surfacing, Catia V5 spec.

Click Here for Videos

To see just how quickly you can learn Automotive Modeling, with a Pro. Alias Trainer to help you

NURBS FROM MESH VIDEO click here

For student’s who have the objective of finding a CAD job in the near future, I still teach One to One students and all of these students get Automotive Modeling or Design/Modeling jobs, so it’s a great investment to make.

Check-Out my Customer Feedback,

Many of my students make it to the top and succeed in becoming pro. Alias Digital Modelers. The hourly rate is very high and there are vacancies in UK. France, Germany, Italy, Spain, Sweden, USA, Brazil etc.

On my website I teach you how to build the models you need to get accepted at interview. Why not take a look?

To Learn Alias Automotive to Industry Entry level has been made easier.

For student’s who have the objective of finding a CAD job in the near future, I still teach One to One students and all of these students get Automotive Modeling or Design/Modeling jobs, so it’s a great investment to make. The hourly rate is very high and there are vacancies in UK. France, Germany, Sweden, Spain, USA, Brazil etc. I can only take a maximum of 5-7 students at any one time. I teach all levels right up to Post Graduates. I have never had a Private student fail to get an Alias Automotive job (Companies include Ferrari, GM, Lotus, Opel, Audi Seat etc. ). If you wish to apply for a place, please email me with all your details.
Why not visit my website and take a look for your self?
Over 100 videos on many, many aspects of Learning Pro. Alias
I show you how to build a Complete Audi A5 Sportback (ext.) . Over 50 Videos on that alone !

Info. on Courses:

“Course #1”.

6 Months website access to all website based video tutorials, 167 Euros (215 USD equivalent Sept. 2012)

“Course #2”.

167 Euros (215 USD equivalent Sept. 2012) 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 videos including my ” Private Student Training Videos”. You will build at least 3 complete automotive exteriors. The course also includes an intensive Reverse Engineering section, which required by most employers.

“#3 Full Pro. “Elite” Course”.

Fast Track Full Pro. “One to One” Course with weekly reviews and coaching 200-250 Euros (USD. 260-320 approx. Sept. 2012) per month. One to One Private tuition. 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

NB: Typically students pay 50% of the cost of the “Elite” course by monthly installments settling the balance over time,  once they have an Alias Automotive contract.

For more info,

Just register on my website and I’ll send you all the details
www.learningalias.co.uk

*** Special 25% Discounts for US students (Message me on my website for details)

USA:

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.

Regards

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

This is one of the current projects which I am working on with my Advanced Students.

It is a class A Fully blended C Pillar built in single span with very neat CV hulls and max gap tol = 0.001mm.

It is this standard of modeling that you need to aspire to if you want to enter the Automotive Industry and be respected as a competent improver. One of my students started with Fiat 3 months ago, they have since seen his potential value and placed him at Maseratti, if all goes well he will be offered a contract at Ferrari in Jan 2012

They are all working on there main Exterior projects, but also study Advanced Surfacing

of Areas such as this C-Pillar and Deck. To build this area with good highlights the patch-layout must be correct and the chordal width of the blend must be variable ie: it has to be the appropriate width all the way around , if the highlights are going to flow correctly

This is a Fully Blended C-Pillar,  

as used by Merceds, Audi And BMW. In this model there are no tangent breaks in which to hide crvtr. cont. issues, so it is a very challenging project to model

G3 Curvature Continuity

Also part of the course G3 crvtr. cont. is what all modelers aspire to achieve. In the above picture we are viewing the geometry with Limit Edge Lenght set to max of  5.00. The above geom. is modeled to Class A and tolerances are Catia V5 (max. gap < 0.001mm.)

  At this level, students learn how to control Highlights,

as they will be asked to do by Designers, once they start modeling for real in an Automotive Design studio

This project is completed working to tight tols. The spec is max. gap < 0.001mm. with the more experienced students working to Catia V5 max. gap =0.001 mm.

By the end of the course the aim is for students to be able to produce good accurate work quickly, which is what will be required of them in Industry

Here we are using Visual Curves 

to replicate the surface highlights. The course covers how to use all the Alias Evaluation tools

Note: the rear screen has been modeled symmetrically

Kind regards

graham bullock

Come an learn Alias or Boost your current Alias skills to FULL Pro. Automotive entry level

www.learningalias.co.uk

I am busier than ever these days

with contract modeling, teaching one to one students from all 5 continents and now of course my brand new website has gone live and it is possible to learn Alias Automotive to a professional level for the lowest rate on the planet.

Pictured below is an Audi A5 Sportback built by one of my students who is now a Digital Sculptor for GM.

Full HD video, just click the picture below

I am now putting some of my tutorials on YouTube, so whilst you’re there you may wish to check them out. There’s a full tutorial on how to create a Ball Corner to Class A Surfacing, Catia V5 spec.

Click Here for Videos

To see just how quickly you can learn Automotive Modeling, with a Pro. Alias Trainer to help you

NURBS FROM MESH VIDEO click here

For student’s who have the objective of finding a CAD job in the near future, I still teach One to One students and all of these students get Automotive Modeling or Design/Modeling jobs, so it’s a great investment to make.

Check-Out my Customer Feedback,

Many of my students make it to the top and succeed in becoming pro. Alias Digital Modelers. The hourly rate is very high and there are vacancies in UK. France, Germany, USA, Brazil etc.

On my website I teach you how to build the models you need to get accepted at interview. Why not take a look?
Info. on Courses:

“Course #1”.

6 Months website access to all website based video tutorials, 167 Euros (200 USD equivalent Nov.2011)

“Course #2”.

167 Euros (200 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 videos including my ” Private Student Training Videos”. You will build at least 3 complete automotive exteriors. The course also includes an intensive Reverse Engineering section, which required by most employers.

“Course #3”.

Fast Track Full Pro. “One to One” Course with weekly reviews and coaching 250 Euros (USD. 300 approx. Nov. 2011) per month. One to One Private tuition. 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
www.learningalias.co.uk

USA:

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.

Regards

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