Subject:
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Re: Use of arbitrary elements with LSynth
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 22 Apr 2003 20:26:24 GMT
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Viewed:
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978 times
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In lugnet.cad.dev, Larry Pieniazek writes:
> In lugnet.cad.dev, Larry Pieniazek writes:
>
> > I found the code (I was looking for released files, not in the CVS tree) and
> > have extracted it (via WinCVS) to take a look...
>
> OK, I did a little digging. If I understand what I am reading, the various
> types of things that can be synthesized are defined with constants in the
> lsynth.h include.
>
> Elsewhere in the code these constants are checked (driven by what's found in
> the .dat file being processed) to determine various things. For example the
> function calc_angles in band.c uses these constants to determine angles of
> things (based on the constraint that's being rounded)... this sort of
> decision making appears in a number of places, but the numbers used depend
> on the type of the thing being synthesized.
You read undocumented code quite well!
>
> If I'm reading things right, to hack another type of synthesized thing in
> would mean merely finding all the places where these constants are evaluated
> and adding an additional elseif to honor the new type (depending on if it
> was band or tube).
Yup. But unfortunatly you want to combine open things (tubes) with closed
loops (bands), and the program is fundamentally *not* written for that.
Bummer.
>
> All that needs to be done (for string) to do that is decide what a good
> element to represent a string segment is, and what the basic geometry of it
> is (x,y,z dimensions).
>
> But I don't HAVE a good element! The one I use is crappy, it's just an
> approximation and just something I hacked up quickly. If committment to that
> element is made, we all would regret it later. Better to allow that we swap
> out definitions once someone does a better job of modeling string than I
> did. The dimensions of a better string element may vary significantly from
> the dimensions I chose... (because modeling the triplestrandedness may
> require it to be smaller! or larger if you think about how one element has
> to abut the next... unless the element includes 120 degrees of string
> rotation you also have to handle rotating each instance of the element by
> the right amount)
Will the element do for now? Maybe we can enhance it later. As the part
author, you have the right to change it later.
>
> So the better way to do this would be to let the element itself be
> parameterized, that is, supply the element definition (it's dimensions and
> desired rotational orientation) in an external file. I suspect that adding
> that functionality is quite a bit harder as it's not merely hacking in new
> constants in a new elseif block, but actually changing the program to get
> parms from an external file for some (or all?? that would allow other
> elements to be improved if there ever was a need) element types...
>
> That seems pretty hard to me, at this juncture, given that I haven't coded
> in C in years (although one never forgets, it's like riding a bicycle). But
> not undoable.
Then your generic approach is the wrong one for you. Why not just hard code
what you want now in your own private copy (as a make shift tube I guess), and
do with it what you will.
I plan on whacking on LSynth pretty hard after I get to a good pausing point in
LPub. I'm a good candidate for adding what you want.
In the mean time, you can have what you want (sort of.)
>
> On that note, I've installed MinGW to give me gcc (because I see the
> makefule specs gcc as the compiler)... but it didn't come with a make...
> what's a good recommendation for a make? make-3.79.1 ?? Would I need MSys
> too? (win 2k platform)
Kevin
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Message has 1 Reply:
 | | Re: Use of arbitrary elements with LSynth
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| (...) Not to worry, combining things is more of a stretch goal (if you'll pardon the pun). Just one is good enough for now. (...) Maybe that's the way to go. I think actually I would go with Band and then hand edit away the 1/2 (of the synthesized (...) (21 years ago, 22-Apr-03, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Use of arbitrary elements with LSynth
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| (...) OK, I did a little digging. If I understand what I am reading, the various types of things that can be synthesized are defined with constants in the lsynth.h include. Elsewhere in the code these constants are checked (driven by what's found in (...) (21 years ago, 22-Apr-03, to lugnet.cad.dev)
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