On Jan 16, 10:54 pm, "gluteous maximus equus" <n...@[EMAIL PROTECTED]
> wrote:
> > This is probably more than you want to know
> > but here's the entire scope of the project:
>
> Au contraire. That's exactly what's necessary to formulate relevant
> suggestions.
>
> The problem you are seeing is due to fact that ...
> > Edit File brings up the control points
> > for the IGES curves in IBL format.
> ... is a misconception. What you be looking at is the knot vector /
> list or "fit" points; an incomplete curve definition. Thus the loss
> of tangent direction.
>
> I ~might~ do just as you are ... format pt list, crv thru pts.
> I doubt, seriously, I'd worry with tangent direction. The curve
> is good for reference only. If you have Scan-Tools look into Scan
> Crv creation. I ~believe~ it would be precisely what you want for
> Deviation Analysis references while you manipulate your existing ISDX
> Style feature curves to match. Alternatively, you could just use
> the point set for deviation references but that's not as nifty a deal
> if I understand correctly.
>
> If, for some reason, I actually wanted to reconstruct surfaces using
> the im****t curves explicitly I believe I'd create the curves without
> constraints, look at a curvature graph, apply constraints, look at
> curve graph again.
>
> Is this a class project? How "complex" are the surfaces you're
> working with? A little more info ~might~ lead to some additional
> refinements or alternatives, especially with regard to curve
> creation / manipulation, if you want to investigate them.
Not a class project. Not terribly complex surfaces just a surface
blended from sections. The component is a turbine airfoil.
I'm not familar at all with Scan Tools - perhaps it's not in our
license.
I guess the bottom line is that you can't apply tangent conditions to
curves im****ted from an IBL?
If this is the case I'm satisfied with the curve through point method.
Any method that requires manually redefining the curves is not an
option in this case because I'm iterating through several designs to
reach an optimum solution. With the point through curve method I just
read in new points and the curves update including the tangency and
curvature constraints at the ends. In the end it took 2 days to run 15
models. Now that we've found a rough solution we will go back and
manually generate style curves to ensure smooth curvature in the
sections.
Thank you for all the help.
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