2D drawing view issue with swept trajpar wire bundle

[rburk]

I am using Creo6 - version: 6.0.6.0

swept wire bundle using trajpar does not show hidden lines correctly in drawing view.

I've tried changing display settings, part accuracy settings; nothing seems to fix the issue; any ideas ?

thanks

Rich

[StephenW]

I am not familiar with wiring but with any solid, if you have interferences, that will cause hidden line issues on drawing/models but typically doesn't affect shaded models/drawings.

[rburk]

even when I confirm "no interference" still shows incorrectly in drawing views

[StephenW]

Two thoughts:

1 Are the wires solid?, in the model, when you go to wireframe, do they show as surfaces (my color scheme shows them as magenta)

OR

2 how about interference on either end? It looks just like the typical hidden line issue for interference

[rburk]

these are "solid wires"
just showing wire bundle only on drawing - has issues with no-hidden

[kdirth]

Ensure hidden line removal for quilts is set to yes,

[aputman]

I have also had issues with this when there are surfaces intersecting one another.  In your case, (assuming the sketch below is correct) each wire has a shared edge (red circles) with both of its neighbors and  Creo can't interpret where the shared edge belongs and likely doesn't even know the proper orientation of the surface.  If you add a gap between the wires, I'm fairly confident this HLR issue will go away. 

[rburk]

I confirmed sweep sketch has "gaps" 

[tbraxton]

If the wires are tangent, that could be the problem. If they are tangent in the sweep section, then put a small gap in and see if that affects what is seen in the drawing.

[rburk]

here's just the wire bundle only (no tangency) & settings  - still not showing correctly in drawing

[MartinHanak]

Hi,

please upload your model + drawing packed in zip file.

[rburk]

Hey Martin

I uploaded the wire bundle and drawing issue.

[aputman]

If you turn on "fasthlr_drawing", the wire bundle displays correctly.  I don't know the full implication of turning on that parameter. 

[MartinHanak]

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@rburk wrote:

Hey Martin

I uploaded the wire bundle and drawing issue.

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Hi,

your model produces correct view until 6 rotations.

I added parameter MH and relation driving length of bundle.

Maybe the problem is related to model accuracy ... unfortunately I was not able to change it to lower value.

[aputman]

Something you could try is sweeping each wire individually rather than as a bundle.  Maybe the HLR process produces better results when the surfaces are separate features. 

[MartinHanak]

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@aputman wrote:

Something you could try is sweeping each wire individually rather than as a bundle.  Maybe the HLR process produces better results when the surfaces are separate features. 

---

Hi,

I tried it ... no success.

Maybe it is necessary to create bundle as assembly with 3 parts representing individual wires.

[tbraxton]

I just tried using 3 bodies within the part in Creo 7 (1 for each wire) and that does not result in the drawing rendering accurately either.

[aputman · Accepted solution]

I was able to get something that works.  For the trajpar feature, remove the circles representing the wires and instead, draw a line connecting the center of each of the circles, creating a triangle.  Sweep this feature and then use the edges of that sweep as the trajectory for the wires.  I don't know why it works but it does for me. 

[pausob]

To me, it seems to be related using the variable section sweep (and the behind-the scenes algorithms that determine how often the cross-section is computed along the trajectory).  Just a gut feeling, but for example, if this is modeled using plain sweep + warp twist, the drawing shows up correctly:

[rburk]

since we are still on Creo6,

I was able to make it work using your method - edges of surface for the wire sweeps

now dwg shows "no hidden" correctly

thanks for all the help

Rich

[kdirth]

Here is what I get opening your drawing:

Not sure what the difference is in my config.  I don't have fasthlr_drawing set.  

[aputman]

Newer version of Creo perhaps.  I'm using Creo 8 and I see what the OP sees when I open their drawing.