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In the image below, notice that using SolidWorks, I was able to create a surface using an X profile curve arrangement (direction 1 & 2). In Pro-E, the variable section sweep created a T profile curve arrangement, then was mirrored. Can a X profile curve arrangement be created in Pro-E, and if so what surface feature tool would you use?
It can be done with VSS, you simply have to change the sketch point from "origin" to a point in the middle of the first curve, then sketch the second curve. If you prefer sketching before doing the VSS then simply "use edge" in the sketch of the VSS
True Paolo!! but..if You use " use edge" in your sketch, then your surface may not always end up as you want..... it might not follow your origin trajectory...so, probably better to just move the sketchpoint and create a new sketch.
True Paolo!! but..if You use " use edge" in your sketch, then your surface may not always end up as you want..... it might not follow your origin trajectory...so, probably better to just move the sketchpoint and create a new sketch.
Well, using edges is not the best solution in many cases, but if you want to obtain the kind of surface depicted in the example it does perfectly well as long as you keep your VSS with constant cross section and constant normal direction
A Boundary Blend thru a few b-splines created from equations will
generally create the 'heaviest' surfaces you can get for a type of
shape (comparable to most I've seen come from ISDX). They can also
be relatively rough when compared to a swept or minimally defined
Boundary Blend version. FWIW.
Anyway, thinking about the relative 'weights' of different surface
definitions brought to mind one more shape that will trim to an
elliptical boundary; the torus. A couple of variations on that theme ...
(It's probably worth noting when comparing saved to disk file sizes;
size will vary greatly with the type of graphics information saved
with the file.)
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Chris,
I used Rhino to get the CV counts.
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Re VSS and Use Edge, there's a recent post in (I think it was) Part
Modeling Tips & Tricks forum titled something like "Variable Section
(from Equation) Sweep". Sections can't be like a Sketcher section can
be, but they don't have to be constant either.
> I noticed you changed the arc into a spline (convert to spline)
> in the sketch mode to avoid a sharp transition after adding rounds/fillets.
I'd have to go back and look, but I don't think I converted in any of the files
posted in this discussion(?). What you might be looking at are either Conic
Rounds or swept bezier (spline) 'rounds'.
I'm guessing by heaviest you are talking about how 't' in the equations generates some fat geometry as it progresses thru it's loop.
I think that may be one way to express it, "fat"
I was looking at the part and already had the ellispoid model and it justseemed to me that by changing the values, a little trim and a extrude I could reach the same thing.
I don't have access to the comm. version files here at home. Just home version or student or whatever it goes by. So I like pics
or model trees. i certainly have more time for experiments at home than at work, even at work it's been r2001, unless I want tobe in the bosses office
As well as I can tell, "t" spits outa control point every 10 degrees.
if you use the curve for sketch , create entity from edge, then trim back at with datums to where you have only 90 degrees of it... 9 points show up a bit overdefined
Uh huh. It's the type of representation.
A conic (ellipse quadrant or parabola) is defined by 3 CVs and 2 knots at
each end. An equivalent b-spline approximation created as an equation
driven datum curve may be 20 CVs and 24 knots (as a typ for instance, the
number will vary with size, system tolerance and eccentricity). That
doesn't correlate directly to created surfaces, i.e. sweeping a conic arc
along a conic traj creates a b-spline surface rather than a conic surf
and if sys tol is set really tight it can be a very heavy (many CVs and
knots) surface. In contrast; the elliptical paraboloid can be represented
by sweeping a degree 3 bezier along another degree 3 bezier and it will
create a surface defined by (4 U & V) 16 CVS and (3 at each corner) 12
knots. A complete ellipsoid can be created with 8 conic surfaces (7 CVs
and 6 knots each).
Just a bit of trivia unless there are a lot of heavy surface definitions
in an already large model.
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