Catia V5 Boundary
Maricel Fergason
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CAD design engineering services - Catia V4, Catia V5, and CAD Translation. Catia V5 resources - CATBlog. RE: Boundaries vs.Extract 5050t (Aerospace)26 May 06 12:20Using "Boundary Definition" you can limit (Limit1/Limit2)your curve using a point.
To find openings or gaps in Join surfaces use "Connect Checker" and select "Internal edges" RE: Boundaries vs.Extract solid7 (Mechanical)26 May 06 12:26Boundary curves is (in my opinion) a much better way to find the openings and gaps. They display clearly, and create real geometry. Connect checker leaves analytical data, which I have no interest in, 9 times out of 10. ---
CAD design engineering services - Catia V4, Catia V5, and CAD Translation. Catia V5 resources - CATBlog. RE: Boundaries vs.Extract Abaddon (Automotive)30 May 06 09:40The Boundary command is just a specialised verion of the extract command. Computationally they do the exact same math to create the intended curve, but the boundary command adds extra flexibility for constraining the length of your curve.
I do the same thing as "flangewiper". I use "Boundary" to get edges, and use "Extract" to get surfaces and faces. RE: Boundaries vs.Extract giumel (Automotive)(OP)30 May 06 09:56Thanks a lot guys regarding this.
I wish to share some picture taken by my scenario
to show you what happened when I built a point
on the EXTRACTED curve and replaced the surface.
now the problem is:
HOW CAN SHOW YOU MY PICS??
GIUMEL RE: Boundaries vs.Extract jackk (Mechanical)30 May 06 13:01Kapitan submitted this helpful post last year
-tips.com/viewthread.cfm?qid=127497 RE: Boundaries vs.Extract sqi (Aeronautics)21 Jun 06 22:00GSMExtract points to a BRep feature whereas GSMBoundary points to the spec itself, that's why you are more liable to have unstability or problem at replace. googletag.cmd.push(function() googletag.display('div-gpt-ad-1406030293255-2'); ); Red Flag This PostPlease let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
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In the Outer Boundaries tab, select curves or surface edges to form the outer closed boundary. A diagnosis is displayed in the 3D area and the fill surface is previewed within the boundary.
Important:You can also create a fill surface without selecting the outer boundaries. You can select any one of the following:
- Inner boundaries
- Inner boundaries and passing elements
- Passing elements (at least three non-collinear points or a curve).
Optional: In the Inner Boundaries tab, select inner curves or surface edges to form the inner closed boundary.
Note:Only curves corresponding to a single inner boundary are displayed in the list.
The resulting surface will be a fill surface between the outer and inner closed boundaries.Tip:You can switch from the Outer Boundaries and Inner Boundaries tabs during the selection, however, the diagnosis is displayed only for the curves corresponding to the active tab.
Optional: Click Add New Boundary to add a new boundaries or Remove Current Boundary to remove the selected boundary. Important:If you click Add New Boundary, the currently displayed curve is cleared in the list to let select another curve.
Optional: Click Previous or Next buttons to navigate between all inner curves and their supports defining a closed contour. When the current boundary is the last one, the Next button is unavailable. Similarly, when it is the first one, the Previous button is unavailable. You can use the spinners to move from one set of curves to another or directly click a number in the box.
Optional: For both tabs, you can select a support surface for each curve or edge. In this case, the continuity will be assured between the fill surface and selected support surfaces. Note:You can define a support just after the selection of the curve or by clicking the curve in the list and selecting a support. To be able to select a support, the boundary must fully lie on the support.
Optional: For both tabs, you can select a continuity type for each support surface. You can modify the continuity type either from:
- the dialog box: select the input in the list and modify the type from the Continuity combo box, or
- the 3D area: click the widget to switch from one type to another or right-click it and select the type from the contextual menu. Widgets are useful to visualize whether and which continuity is set on a boundary.
Optional: Use the combo to specify the desired continuity type between any selected support surfaces and the fill surface:
- Point
- Tangent, or
- Curvature
- Add a new element after or before the selected one
Optional: In the Passing elements box, select one or more points and curves. This element can either be a point or a curve through which the filling surface must pass, thus adding a constraint to its creation. However, you may need to alleviate the number of constraints by removing the supports.Warning:The passing point should lie within the area delimited by the selected curves. If not, the results may be inconsistent.Tip:You can click to display the Passing Element(s) dialog box and modify the selection.
Optional: You can select the Deviation check box and enter a value to fill the existing gaps. Important: In the Tools > Options > Shape > Generative Shape Design > General tab,
- If the Continuity Type is either set to Tangency or Curvature, the Deviation check box is selected by default.
- The Maximum deviation value is taken as the default deviation value for the fill.
from what wim suggested at least how i am interpreting it, that the surface was trimmed with these curves and actually can reestablish itself through untriming. maybe this is even how this tool would act in that case, but i really dont know anything about the parametrics of catia. but in any case a patch would be the result whatever magic tool you would use. (a stronger rhino native patch would be nice either)
This is possible, but possibly requires a bit more work in Rhino. There are several tools; Surface from Network of Curves, Surface from 2, 3 or 4 edge curves, and as everyone has mentioned the Patch tool. Patch is the closest to what your screenshot shows.
You can try doing it with history on for cutting curves straight on doublecurvature surface, or also with record history cutting flat surface and than flowing it on target surface which has already tangent or curvature accurate 4 srf next to it, to achieve smooth and non destructive workflow, but it needs lot of workaroug. Depends how good results You need, but it is achievable without any plugins. Xnurbs or other similar stuff for me creates maybe nice but quite heavy in isocurves.
Essentially its cheating. You can lower deviation in continuity, the more control-points you add and the closer you move them to the boundary. Numerically, you achieve a higher continuity match but, your surfaces are not really smooth after this operation. Essentially what all these fitting algorithms do, they smooth out the inner cps after the fitting. This means the smoothing algorithm is as importan,t as the fitting algorithm.
However, you are very limited in smoothing, the closer you go to the boundary (otherwise you break the continuity). This creates lots of tension at the transition from the boundary area to the inner area of the surface. You can always see this in surface reflections if you patch/fill forcefully the surface in (and bad conditions are present).
Hello, i was wondering if anyone could explain Optimize Surface, a new feature inside Boundary Blend. See the attached model. I make surfaces such as these all the time & recently switched to Creo 3, saw this new feature, but from what i can see, it far from optimizes my surface, it destroys it. If you take my model, edit definition the boundary blend surface & uncheck the optimize surface, regenerate the model & look at the difference. I have searched for information on this topic & came up with very little, any help here would be appreciated.
I did through trial & error, come up with some very nice surfaces using this model. I made the initial surface as two, revolving the top, & making the lower part a boundary blend. Maybe, thats the key, having a not too complex surface, single entities in the boundary curves.
What this feature does is change the curvature so it smoothly and monotonically varies. Only a few types of products require it like car bodies, but those designers use Alias or CATIA. I suppose some of your high end toothbrushes or housewares could be considered Class A too. Those are usually done by product design firms with Rhino or something conceptual like that. You just don't see Creo in that domain, and if it was it would be ISDX Style. I wonder what the rationale was for adding this to Pro-Surface? Although, really I wonder why Pro-Surface still exists in the first place. It's weird that they still have two different surface modelers in two different places.
This optimize surface feature continues to frustrate me. A year or so on & I don't think i have ever been able to check that box without it having a negative effect on my surface, so I end up un-checking the box & leaving my surface not 'optimized'. I just thought i would bring this post back in the hope that more people are using the feature now & maybe can shed some light on it.
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