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Offset curve BUG (#2371)
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unique  
#1 Posted : Saturday, June 6, 2009 12:27:50 PM(UTC)
unique

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Joined: 6/24/2008(UTC)
Posts: 591
Hi Tim / Ryan,

We still seem to have this problem with offsetting curves it just gives up when it meets a kink ? I dont believe this is an ACIS issue so can we please see this working in the next patch :)
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dudko  
#2 Posted : Sunday, June 7, 2009 2:37:26 AM(UTC)
dudko

Rank: Junior Member

Joined: 4/20/2009(UTC)
Posts: 29
Hi Unique
Temporarily you can use the following
Start with command:
1.Arcs from Curve
Limitations:
geometry is inaccurate
Tolerance with
0.0001 = "Offset" can fail to work
0.00001 = "Arcs from Curve and Offset" can fail to work.
2.Set new segments to group (Arcs,Lines)
3.Offset Curve(Group)
4.Set new segments to group
Limitations:
many commnands does not work with grouped 2D objects.
Example: Command "Path Duplicate" and other
after these steps, command "Join Curve" is unusable, too many segments to join and inaccurate.

Regards Ed
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unique  
#3 Posted : Sunday, June 7, 2009 11:27:06 AM(UTC)
unique

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Hi Ed,

Thanks for your reply. Yeah, I am aware of this workaround but I would like a fix for this problem which has been around too long now ?. In Rhino and Spaceclaim this is possible so why not in ViaCad?? :confused:
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zumer  
#4 Posted : Sunday, June 7, 2009 10:27:31 PM(UTC)
zumer

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Its a sort of 2D analogy to shelling a surface. Success depends on the offset. Maybe some options querying how it should be handled, ie discontinuous segmentation or smooth globally or locally for original or offset copy?
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unique  
#5 Posted : Monday, June 8, 2009 3:08:14 AM(UTC)
unique

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Originally Posted by: zumer Go to Quoted Post
Its a sort of 2D analogy to shelling a surface. Success depends on the offset. Maybe some options querying how it should be handled, ie discontinuous segmentation or smooth globally or locally for original or offset copy?


It doesn't need to be that complex and the user shouldnt have to be faced with all that....its a very simple operation for a capable CAD system
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zumer  
#6 Posted : Monday, June 8, 2009 7:21:32 AM(UTC)
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It's simple if the options are taken out of your hands, but you don't necessarily get the result you think you expected. Rhino is capable of working with spline orders up to 32, unlike most other consumer CAD systems. IGES, for example, only accomodates cubic splines, so how would you want to handle interchange between Rhino and something else using IGES? Do you expect them to look the same and give the same results with that disparity?
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Tim Olson  
#7 Posted : Monday, June 8, 2009 12:56:34 PM(UTC)
Tim Olson

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>>In Spaceclaim this is possible so why not in ViaCad??

Paul

What offset value are you using to get it to work in SpaceClaim? If Spaceclaim can do it we should be doing it as well because this an acis api. I might be missing an option or something.

Tim
Tim Olson
IMSI Design/Encore
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unique  
#8 Posted : Monday, June 8, 2009 1:43:15 PM(UTC)
unique

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Originally Posted by: Tim Olson Go to Quoted Post
>>In Spaceclaim this is possible so why not in ViaCad??

Paul

What offset value are you using to get it to work in SpaceClaim? If Spaceclaim can do it we should be doing it as well because this an acis api. I might be missing an option or something.

Tim


Hi Tim,

Thats what I thought.....Anything really 10,20mm both ways not an issue in Spaceclaim ?. The example is 12mm, Typical ACIS notice the curve is broken up where there is a kink

Hope you fix this soon ;)
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Tim Olson  
#9 Posted : Monday, June 8, 2009 2:15:30 PM(UTC)
Tim Olson

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Ok thanks, will contact the guys at spatial to find out what I'm missing.

Tim
Tim Olson
IMSI Design/Encore
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unique  
#10 Posted : Monday, June 8, 2009 2:53:06 PM(UTC)
unique

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Originally Posted by: Tim Olson Go to Quoted Post
Ok thanks, will contact the guys at spatial to find out what I'm missing.

Tim


NP - Dont mention my name !! :D:D:D:D
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Tim Olson  
#11 Posted : Monday, June 8, 2009 3:41:01 PM(UTC)
Tim Olson

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Error on my part!

Fixed in the next 836 build for all products.

http://www.csi-concepts.com/Demo/videos/offsetg2.mov

Steve, this now handles your offset example as well.

Many thanks all,

Tim
Tim Olson
IMSI Design/Encore
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ZeroLengthCurve  
#12 Posted : Monday, June 8, 2009 4:14:10 PM(UTC)
ZeroLengthCurve

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On what model does THAT geometry belong? Is that a biomedical implant/instrument? Takes me back to the 8th grade... a class offered.... to keep teens out of "trouble"....
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zumer  
#13 Posted : Monday, June 8, 2009 4:37:07 PM(UTC)
zumer

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Who was that masked man? Can't fault that response time.
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Steve.M  
#14 Posted : Wednesday, June 10, 2009 5:27:40 AM(UTC)
Steve.M

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I was informed this was a problem/limitation from Acis.

Originally Posted by: Tim Olson Go to Quoted Post

This is not a bug, but is the intended action by ACIS. ACIS will offset the curve up to the point where the curve will have an issue due to curvature.



- Steve
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blowlamp  
#15 Posted : Saturday, June 27, 2009 1:31:38 PM(UTC)
blowlamp

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Greetings all.
I've just tested this in v838 using the sample file from the start of this thread. It works ok until I input an offset of less than 0.5, at which point the lines are no longer parallel to each other. Apart from that, it has been ok for me.

Thanks for the work Tim and team.

Martin.
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Tim Olson  
#16 Posted : Saturday, June 27, 2009 1:55:05 PM(UTC)
Tim Olson

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Hi Martin

0.5mm or 0.5 inches? At 0.5mm it seems aok. At 0.5 inches, it segments the curve at discontinuities.

Regards
Tim
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Tim Olson
IMSI Design/Encore
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blowlamp  
#17 Posted : Saturday, June 27, 2009 2:42:50 PM(UTC)
blowlamp

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Tim.
I use an XP SP3 PC set up in mm.
I tried it again and it was ok :o So I altered the offset value 3 or 4 times, and then it got confused. I used offsets like 50, 0.5, 30, and 10 etc to pull it around a bit. Once it's in this state, the offset value doesn't seem to relate to the offset distance any more.

Thanks.
Martin.
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blowlamp  
#18 Posted : Saturday, August 8, 2009 5:54:50 AM(UTC)
blowlamp

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Is there any chance of looking at this issue re my last post? If you enter an offset value that is large enough to cause the curve to clip, it then becomes impossible to recover that offset, and you have to delete it and start again.

Thanks.
Martin.
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jfc1068  
#19 Posted : Saturday, August 8, 2009 6:12:01 AM(UTC)
jfc1068

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What about offsetting a simple curve? I follow all the steps I do when offsetting a line but nothing happens
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blowlamp  
#20 Posted : Saturday, August 8, 2009 6:44:50 AM(UTC)
blowlamp

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Originally Posted by: jfc1068 Go to Quoted Post
What about offsetting a simple curve? I follow all the steps I do when offsetting a line but nothing happens


Are you still on v5 2D?
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