Some times to Check a Quality of a Surface C series is used other times G series is use what is the reason for this difference?

C0-Contact

C1-Tangent

C2-Curvature Continues

G0-Contact

G1-Tangent

G2-Curvature

G3-Curvature

Some times to Check a Quality of a Surface C series is used other times G series is use what is the reason for this difference?

C0-Contact

C1-Tangent

C2-Curvature Continues

G0-Contact

G1-Tangent

G2-Curvature

G3-Curvature

I have SWX standard version only. I do not know whether standard version is enough to follow Matt Lombard episodes. Do you know it? If so I will follow it after completing my existing study materials.

Maha Nadarasa wrote:

I have SWX standard version only. I do not know whether standard version is enough to follow Matt Lombard episodes. Do you know it? If so I will follow it after completing my existing study materials.

SWX Standard is just perfect. Matt Lombard can confirm that.

Maha Nadarasa wrote:

I have SWX standard version only. I do not know whether standard version is enough to follow Matt Lombard episodes. Do you know it? If so I will follow it after completing my existing study materials.

No, you don't need Pro version to follow the surfacing stuff on my Episodes site.

Hello Maha,

The difference between the two (G and C) definitions are identical in G0 and G1 but in G2, it has to do with parametric, where as C2 (and higher) is parameterized and G is not. They both achieve a similar result in NURBs

*First- and second-level parametric continuity (C*^{0}and C¹) are for practical purposes identical to positional and tangential (G^{0}and G¹) continuity.*Third-level parametric continuity (C²), however, differs from curvature continuity in that its parameterization is also continuous. In practice, C² continuity is easier to achieve if uniform B-splines are used.*Mark Biasotti wrote:

Hello Maha,

The difference between the two (G and C) definitions are identical in G0 and G1 but in G2,

**it has to do with parametric**, where as C2 (and higher) is parameterized and G is not. They both achieve a similar result in NURBsWhat do you mean by "

**parametric**" here?. It has become a confusing term. As far as I know imported part is**not**a parametric one, because it does have an empty design tree and does not have any parameters to controlled it.Maha,

I believe it is the way the surface (or curve) is created, solved and updated and I'm not quite sure but I suspect that it has to do with when the curve is created or edited that the shape of the curve is parametricized - i.e. driven by previous positions and then updated...

This video was uploaded in Jun 18, 2019. Time 2.29

Great Curves, Great Surfaces - SOLIDWORKS Tutorial - Zen & the Art SOLIDWORKS Surfacing 02

Maha Nadarasa wrote:

This video was uploaded in Jun 18, 2019. Time 2.29

Great Curves, Great Surfaces - SOLIDWORKS Tutorial - Zen & the Art SOLIDWORKS Surfacing 02

That slide is obsolete.

Do you know any sites explaining Torsion relation? I went to many sites it is analyzing simulation torsion only.

Maha Nadarasa wrote:

Do you know any sites explaining Torsion relation? I went to many sites it is analyzing simulation torsion only.

The best explanation I found is in Matt Lombard's eLearning portal. Please ask him to share it with you.

Thanks, Alin.

Torsion is like rate of change of curvature. So G3 would be the condition where a transition between curves or faces has the same rate of change of curvature on each side of the transition.

Think of a wire (the spline) being bent by a torque whose axis of torque is perpendicular to the plane of the wire such that the wire is bent into a changing curvature. That torque is analogous to the torsion concept used as C3/G3. If you've had calculus or analytical geometry, you're familiar with position, velocity (rate of change of position), acceleration (rate of change of velocity), jerk (rate of change of acceleration). That concept is directly related to the smoothness of geometrical transitions.

The course doesn't get into calculus or any advanced math aside from illustrating concepts.

If you want to check out the course, here's the link https://episodes.dezignstuff.com/blog/

Maha Nadarasa, looks like you are passionate about surfacing. The best way to get quick answers to questions you have, and especially to the ones you are not even aware of, also, the best way to quickly master surfacing it to subscribe to Matt Lombard’ episodes.

In less than a week, your knowledge would advance by the equivalent of 2 years of trial and error and forum questions and answers.

This is just my opinion.