How do I create a curve on a surface tangent to 2 other curves already
How do I create a curve on a surface tangent to 2 other curves already
(OP)
How do I create a curve on a surface tangent to 2 other curves already on that same surface. The surface is a simple surface (surf1, curve, curve and the rads are the same). On that surface I have two circles created via Geodesic. Now I want to create a line atngent between those 2 curves on the same surface. How do you do it?





RE: How do I create a curve on a surface tangent to 2 other curves already
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Surely there is a capability within the Geodesic function to do what your're after. The next picture is a zoom of the Geodesic Menu, it's blurred but most of the options can be made out.
PT PT should give the geodesic path between the circle centres on the support, and PARALLEL or TAP(er) OFFSET will probably give the curves required. All this is from memory, but it should point in the right direction.
For my own interest and amusement I've done this by construction in V5, so that if it had to be done that way, the same method will apply in V4.
Two circles have been normally projected onto the Support and a line that connects their centres ( on the Support ) normally projected to the Support. This Curve is considered to be path of the centre of the tangential curves, which are Parallel curves offset on the Support, by the radius of the original circles, that were directionally projected onto the Support.
In the Thread question, the simple surface is a Surf1:Curve Curve where R1 = R2 and are on parallel planes, with their centres on a common line, so the required Curves can be considered parts of a Helix.
RE: How do I create a curve on a surface tangent to 2 other curves already
You could also try using your new curves to make surf1 cylinders and intersecting them with your original surface.
Have fun
RE: How do I create a curve on a surface tangent to 2 other curves already
The geodesic method is absolutely the way to go.
How is it that you've never used geodesic? This is, according to my estimation, one of the fundamentals of advanced curves and surfacing in V4...
Just curious.
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RE: How do I create a curve on a surface tangent to 2 other curves already
RE: How do I create a curve on a surface tangent to 2 other curves already
RE: How do I create a curve on a surface tangent to 2 other curves already
I'm thinking that it was about the same price as a whole design seat, so many folks didn't buy it, even though they were the ones clamoring for it.
RE: How do I create a curve on a surface tangent to 2 other curves already
Guess I can chalk this one up to ignorance.
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RE: How do I create a curve on a surface tangent to 2 other curves already
Over the years lots of new functions were written and became available, which did these jobs in a slicker way and made life easier. Today in V4, Law and Surf2 don't look much different to Version 1.
On a nostalgic note, this old photograph of the screen shows what Catia looked like in 1983. Black and White only, no fill or colour, no mouse, just a light pen which worked by indicating or selecting elements on the screen. The terminals were IBM3250 and Catia ran on a massive mainframe, alongside Cadam and various analysis software programs.
But, getting back to the Thread topic, Lerxst if you've got Geodesic then I'd be amazed if you can't do what you want, in that function. Perhaps you can let us know.
RE: How do I create a curve on a surface tangent to 2 other curves already
you didn't need gym with those light pens although I was on CADAM back then. They built a special air conditioned room for the mainframe and had to piledrive the foundations because the site was boggy. We got monitered for performance by 'attentions per hour' and had to log off to take even internal phone calls!