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by wsteffe
Mon Aug 31, 2020 6:23 am
Forum: Open discussion
Topic: Multibody model comparison
Replies: 49
Views: 2576

Re: Multibody model comparison

I missed an important point of last realthunder post. The following: The internal DAG representation of the history goes further than object level, into individual geometry element level. Of course, as a developer, you are free to use your preferred internal data structure but, as far as we are conc...
by wsteffe
Mon Aug 31, 2020 3:36 am
Forum: Open discussion
Topic: Multibody model comparison
Replies: 49
Views: 2576

Re: Multibody model comparison

I am sorry, the histories I made for your case are wrong. The circular edge has not to be put on a sketch to make a fillet (it would have to if it were a pad). The right history is:

Pad
|
Pocket
|
Fillet

And there is only one possible choice.
by wsteffe
Mon Aug 31, 2020 3:10 am
Forum: Open discussion
Topic: Multibody model comparison
Replies: 49
Views: 2576

Re: Multibody model comparison

I think we are pretty much on the same page, except that you are speaking more from an end-user point of view, while I am from the programmer side. It is true. But I think there is also a slightly difference in the meaning we give to the term "history". In your last post you said ".. internally, th...
by wsteffe
Sun Aug 30, 2020 9:18 am
Forum: Open discussion
Topic: Multibody model comparison
Replies: 49
Views: 2576

Re: Multibody model comparison

Here I would like to make more clear my proposal with reference to a simple design flow and a comparison between the data structure which would be generated in Catia (shloud be more or less the same in FC) and in my hypothetical CAD model. DESIGN flow: 1) Insert a new body named A (the new body is a...
by wsteffe
Sat Aug 29, 2020 7:16 pm
Forum: Open discussion
Topic: Multibody model comparison
Replies: 49
Views: 2576

Re: Multibody model comparison

I still think its good style to clarify possibly unclear notions I also think so. It is just that I do not like inconsequential statements. These kind of statements do not clarify anything but instead make things more confused. An example of inconsequential statements is the following: Les us suppo...
by wsteffe
Sat Aug 29, 2020 12:17 pm
Forum: Open discussion
Topic: Multibody model comparison
Replies: 49
Views: 2576

Re: Multibody model comparison

so I don't agree with this analogy that there has to always be a single global history. I assume that you are speaking about single global history in a multibody part. In principle you are right. In fact in the trivial case of a multi-body without any cross reference between different bodies, the s...
by wsteffe
Sat Aug 29, 2020 11:39 am
Forum: Open discussion
Topic: Multibody model comparison
Replies: 49
Views: 2576

Re: Multibody model comparison

If you make a change to something you have created earlier it is a new element at the end of the history and nothing can be easily seen from that I was just answering to the following statement you made before: a fundamental advantage of parametric design is that it is possible to later change thin...
by wsteffe
Sat Aug 29, 2020 9:19 am
Forum: Open discussion
Topic: Multibody model comparison
Replies: 49
Views: 2576

Re: Multibody model comparison

discussed if it is advantageous to return to the linear model Here nobody is proposing to adopt a linear graph. History is not an alternative to DAG it is just an ordering of DAG nodes. This ordering is already present in all CAD system. It is only some of them do not expose it to the user. Yet a f...
by wsteffe
Sat Aug 29, 2020 8:59 am
Forum: Open discussion
Topic: Multibody model comparison
Replies: 49
Views: 2576

Re: Multibody model comparison

saso, but I never said that the DAG is linear. History is not DAG. It is an order relation defined over the set of DAG nodes.
by wsteffe
Sat Aug 29, 2020 8:42 am
Forum: Open discussion
Topic: Multibody model comparison
Replies: 49
Views: 2576

Re: Multibody model comparison

It may appear to end-user that some CAD multi-body has separate linear histories, some may have a single global history, but underneath it they all the same, a big DAG, that is. While I do not agree with the saso objection against DAG, his post made me think about this statement of realthunder. I a...

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