logo
NOTICE:  This is the new PunchCAD forum. You should have received an email with your new password around August 27, 2014. If you did not, or would like it reset, simply use the Lost Password feature, and enter Answer as the security answer.
Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error
another Guide Cover Surface tool question
Options
Go to last post Go to first unread
Previous Topic Next Topic
Art Smith  
#1 Posted : Wednesday, April 18, 2018 8:45:02 PM(UTC)
Art Smith

Rank: Senior Member

Joined: 1/16/2015(UTC)
Posts: 351

Thanks: 49 times
Was thanked: 43 time(s) in 30 post(s)
has anyone figured out how to use the "Guide Cover Surface" tool starting with a concave curve/perimeter?? the perimeter is closed and the guide curve is coincident on both ends.....
see attached example. should I be attempting to use a different tool?

if concave curves/perimeters are just a "problem" for the current tool set, I suggest that getting concave curve/perimeter functionality/capability needs to be added to the "to do" list of enhancement !!!

Art
artesmith@earthlink.net

Art Smith attached the following image(s):
guide cover surface tool questions.jpg (44kb) downloaded 7 time(s).

You cannot view/download attachments. Try to login or register.
Back to top
digitalphaser  
#2 Posted : Thursday, April 19, 2018 2:53:53 AM(UTC)
digitalphaser

Rank: Senior Member

Joined: 4/17/2015(UTC)
Posts: 256
Man
Germany
Location: Berlin

Thanks: 17 times
Was thanked: 72 time(s) in 51 post(s)
The problem of surface modeling interests me for a long time. I came to the conclusion that the Shark/VC works well only with simple shapes.
Guide Cover Tool works well with open and closed curves. But the curves must be symmetrical, have few points, the angle between U/V curves is not more than 45°. Any deviations lead to unpredictable results.

Unfortunately, all of the above also applies to solid modeling. All solid utilities(blending, shelling, bending etc...) work well only with simple objects. Perhaps it is normal for industrial produkt modeling. I do not know. But for concepting, sketching and prototyping it is a real problem.
digitalphaser attached the following image(s):
cwg8.jpg (141kb) downloaded 4 time(s).
cwg9.jpg (104kb) downloaded 4 time(s).

You cannot view/download attachments. Try to login or register.
Back to top
digitalphaser  
#3 Posted : Thursday, April 19, 2018 3:01:35 AM(UTC)
digitalphaser

Rank: Senior Member

Joined: 4/17/2015(UTC)
Posts: 256
Man
Germany
Location: Berlin

Thanks: 17 times
Was thanked: 72 time(s) in 51 post(s)
My favorite alternative method for similar tasks is Net Surface Tool. Although this tool is also very limited.

By the way, I express only my point of view. More experienced and advanced users can have a more qualified solution.

Edited by user Thursday, April 19, 2018 3:05:24 AM(UTC)  | Reason: Not specified

digitalphaser attached the following image(s):
cwg10.jpg (119kb) downloaded 6 time(s).

You cannot view/download attachments. Try to login or register.
Back to top
Tim Olson  
#4 Posted : Friday, April 20, 2018 3:21:53 PM(UTC)
Tim Olson

Rank: Senior Member

Joined: 2/2/2007(UTC)
Posts: 5,450
United States

Was thanked: 508 time(s) in 354 post(s)
Cover surfaces do some some limits regarding the input curves. The boundary curves need to be connected and plane projectable (the guides need to project within the boundary curves). Below is a link to a video and PDF overview describing some of the functionality for Cover with Guides.


http://www.masterviacad.com/videos/cover/index.html

Tim

Edited by user Friday, April 20, 2018 3:23:26 PM(UTC)  | Reason: Not specified

Tim Olson
IMSI Design/Encore
Back to top
digitalphaser  
#5 Posted : Saturday, April 21, 2018 12:33:02 PM(UTC)
digitalphaser

Rank: Senior Member

Joined: 4/17/2015(UTC)
Posts: 256
Man
Germany
Location: Berlin

Thanks: 17 times
Was thanked: 72 time(s) in 51 post(s)
Originally Posted by: Tim Olson Go to Quoted Post
Cover surfaces do some some limits regarding the input curves. The boundary curves need to be connected and plane projectable (the guides need to project within the boundary curves). Below is a link to a video and PDF overview describing some of the functionality for Cover with Guides.


http://www.masterviacad.com/videos/cover/index.html

Tim


Nice. I just do not understand. Is it good or bad? Your video demonstrates a few primitive examples. As advertising it works well. It would be nice to notify users in advance about some limitations of this tool.

I do not understand also why is Spline Surface needed if it does not work in most cases. Although this theme deserves a separate topic. Spline Surface has a lot of absurdities too.
digitalphaser attached the following image(s):
cwg11.jpg (107kb) downloaded 2 time(s).

You cannot view/download attachments. Try to login or register.
Back to top
Art Smith  
#6 Posted : Saturday, April 21, 2018 5:58:48 PM(UTC)
Art Smith

Rank: Senior Member

Joined: 1/16/2015(UTC)
Posts: 351

Thanks: 49 times
Was thanked: 43 time(s) in 30 post(s)
Tim-

thanks for posting the Advanced Covering section of the documentation. a "cover-to-cover" read of the material confirmed I was at least using the correct approach; closed perimeter with no gaps (trailing edge closed with an arc tangent to both splines from AeroPack and verified with PowerPack) and a guide curve that falls within the projected outline of the cover perimeter....... the "Cover Surface" tool (ie: without the guide curve) produces a surface so I concluded the perimeter on the curious concave surface wasn't the problem! grasping for straws, I switched to the "Loft Guide Surface" tool and obtained a non-solution which was viewed as major progress from the cryptic error message produced by the "Cover Guide Surface" tool!! based on the convoluted shape of the non-solution surface produced by the "Loft Guide Surface" tool I guessed SharkCAD Pro thought the opportunity was over constrained...... after splitting both the perimeter curve and the guide curve, the "Loft Guide Surface" tool produced surfaces consistent with my expectations given the inputs!! unlike the math I struggled with decades ago, SharkCAD Pro appears to like working half the opportunity at a time and does NOT appreciate symmetric boundary conditions. see attached image.

Art
artesmith@earthlink.net
Art Smith attached the following image(s):
guide cover surface tool questions 2.jpg (52kb) downloaded 6 time(s).

You cannot view/download attachments. Try to login or register.
Back to top
Tim Olson  
#7 Posted : Tuesday, April 24, 2018 12:13:29 PM(UTC)
Tim Olson

Rank: Senior Member

Joined: 2/2/2007(UTC)
Posts: 5,450
United States

Was thanked: 508 time(s) in 354 post(s)

Hi Art

Do you have just the boundary curves and guide curves in a file? I can check using the cover surface.

Tim
Tim Olson
IMSI Design/Encore
Back to top
Art Smith  
#8 Posted : Tuesday, April 24, 2018 12:50:38 PM(UTC)
Art Smith

Rank: Senior Member

Joined: 1/16/2015(UTC)
Posts: 351

Thanks: 49 times
Was thanked: 43 time(s) in 30 post(s)
Tim-

guide cover surface fault isolation file attached, thanks!

Art
artesmith@earthlink.net
File Attachment(s):
cover guide surface fault isolation file.sfx (27kb) downloaded 7 time(s).

You cannot view/download attachments. Try to login or register.
Back to top
rockyroad_us  
#9 Posted : Tuesday, April 24, 2018 2:16:32 PM(UTC)
rockyroad_us

Rank: Senior Member

Joined: 9/12/2009(UTC)
Posts: 609
Man
United States
Location: In my place

Was thanked: 59 time(s) in 51 post(s)
Originally Posted by: Art Smith Go to Quoted Post
Tim-

guide cover surface fault isolation file attached, thanks!

Art
artesmith@earthlink.net


Looks like one end of the center curve is not really attached to the other end points of the other two outside curves. You can just use the skin surface and adjust via the data options.


FX 7-FXPro14-1650
MacPro 11.7.4
2x2.8GHz Quad Xeon 32GB
NVIDIA 4 K5000 4GB
Work
Back to top
WWW
Tim Olson  
#10 Posted : Monday, April 30, 2018 12:59:42 AM(UTC)
Tim Olson

Rank: Senior Member

Joined: 2/2/2007(UTC)
Posts: 5,450
United States

Was thanked: 508 time(s) in 354 post(s)
>>guide cover surface fault isolation file attached, thanks!

Art, no luck with this file yet...

Tim

Tim Olson
IMSI Design/Encore
Back to top
Users browsing this topic
Guest
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Powered by YAF.NET 2.1.2 | YAF.NET © 2003-2025, Yet Another Forum.NET