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class A surfacing | classasurfacing | class A surface| Digital Sculpting > Class A Surfacing | Introducton > General Discussion | Class A Surfacing | Class A Surface > Tangency, the ugly sister of Continuity?
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Author Topic: Tangency, the ugly sister of Continuity?  (Read 287 times)
Jungle tim
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« on: December 19, 2009, 09:01:16 AM »
Im learning class-a surfacing, I come from a mechanical part design background.

I always thought that tangency was only to be used for non cosmetic areas.  Tan constraints are to be hidden away and not spoken of.  In the dark inside of a product next to the ejector pin marks, Sink marks and ribs etc.
But recently I have seen more tangency used in the tutorials I am learning with.


My question is when do designers and modelers choose to use tangency and what are the deciding elements that allow tangency to be used?

What is the experience of designers/modelers/engineers here?
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Class A Surface
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« Reply #1 on: December 20, 2009, 12:33:05 PM »
Believe it or not there are plenty of places G1 (tangency) is used.

If a person builds there blends using conic surfaces then there will be only G1. Conics are 2 degree. These can sort of fudge G2 if all accelerations and alignments of primary slabs are just right.

There are also certain studios that do not bother going past G1 if the size of the blend is smaller than 3mm. This is because of certain homologation requirements. Plus 3mm blends are quiet small so the look of the blend is nearly imperceptible.

Also do you have an example of the data you have seen?

Regards
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