Subject:
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Re: Modelling !
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 9 Jun 2000 19:59:19 GMT
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Reply-To:
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Rui.Martins@link^antispam^.pt
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Viewed:
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668 times
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On Fri, 9 Jun 2000, Steve Bliss wrote:
> In lugnet.cad.dev, Rui Martins wrote:
>
> > Has some of you may remember, I have modelled the super car (8880) wheels and
> > tires, but when I modeled it I used Metric measurements (millimeters).
> >
> > I would Like to know if there is an approved standard for a convertion ratio,
> > between millimeters and Ldraw units ?
> > So that I can scale the modelled parts and have them corrected!
>
> I believe the conversion is 0.4mm = 1 LDU. At least, that's what I always
> use.
Thanks !
So, 1.00 mm = 2.5 LDU
> > I would also like to know when are we going to define orientation standards /
> > guidelines for when a part is created ?
>
> Standards are already there. They just aren't strictly enforced. As I see
> it, there are two basic "orientation rules":
> 1. Do the same thing as other, similar parts which were previously modeled.
> 2. If there is inconsistency in the existing parts library, go with the
> majority or the senior parts.
I call this common sence, which I think everyone should use !
> If a part truly breaks new ground, and there aren't any sufficiently
> similar parts, then go with the following guidelines:
Are these your opinions only, or is assumed buy other people too ?
I agree with most of it !
> 1. If the part is symmetric along both horizontal dimensions, the wider
> dimension should go along the X-axis.
Check!
> 2. If the part is asymmetric along one horizontal dimension, that dimension
> should go along the Z-axis, with the front/tip of the part pointed toward
> Z-.
Check!
> 3. Center the part on X-Z.
Shouldn't we always center on the center of a stud or connection (like wheels)?
Not on Total X/Z size.
> 4. Generally, put the top of part (not including studs) at Y=0.
Check!
> 5. Rotating parts *may* be centered on the point of rotation.
Check !
Maybe this should be placed in http://www.ldraw.org somewhere, maybe open anew
section for modellers, like a getting started page, with rules and guidelines.
> > Since I have seen technic Axels(non-threaded/threaded), wheels, Wind Screens,
> > Windows, doors, etc... with non matching orientations.
> > (example: Two wheels which have different rotation axis)
> > suppose you had diferent orientations for different bricks, that would be a
> > mess, so Why did this happen for the parts I mentioned before ?
>
> Because we're all volunteers.
I know that !
what I meant was:
How did those parts get by us, without this beeing noticed ?
> > P.S. I know it is a huge task if we ever need to make all these parts have the
> > same orientation. We would probably have to make a program to correct our dat
> > files, when the parts were reoriented. Sigh..
>
> Interesting thought. If the program was programmed with all the version
> information of the parts (using the 0 Official L-CAD Update XXXXXXX line),
> it could be done.
I meant something along the lines of a program that would rotate/translate all
parts (which would be defined in a .CFG file or something) according to a
specific transformation matrix for each, and applied this to one of our personal
model files, correcting the parts, their references/placement.
See ya
Rui Martins
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Message has 1 Reply:
 | | Re: Modelling !
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| (...) Some of this has come up in various discussions. I'm not sure if all of it has or not. (...) No, centering on a stud isn't necessary. Look at 3001.dat, the 2x4 brick. It is centered on X-Z, not on a stud. The same applies for all other (...) (24 years ago, 9-Jun-00, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Modelling !
|
| (...) I believe the conversion is 0.4mm = 1 LDU. At least, that's what I always use. (...) Standards are already there. They just aren't strictly enforced. As I see it, there are two basic "orientation rules": 1. Do the same thing as other, similar (...) (24 years ago, 9-Jun-00, to lugnet.cad.dev)
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