Subject:
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Mirrored parts and studs
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 1 Jul 2003 14:57:01 GMT
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Viewed:
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1361 times
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There is somewhat of a disagreeance going on over at the PT about mirrored parts
and I thought I'd bring it to the whole community to discuss.
Here's a little background for the non initiated:
In order to same time and DAT code if a part has a mirrored brother then one
part reference the other and applies a mirrored matrix. For example, the
Technic Panel #1 just references Technic Panel #2 and applies the matrix
-1 0 0 0 1 0 0 0 1
This is the preferred way to represent a mirrored part pair. There is no
disagreement about this methed of coding parts. The problem comes in when you
add studs.
If you have stud the the part and apply a mirror matrix, most of the time
nothing is wrong. Along comes L3P or LDView that, based on user preference, add
the LEGO logo to the top of the studs. If the part is a mirror part then the
added logos also show up mirrored. Here's where we get 2 dissenting opinons:
1.) Nothing is wrong with the part. The stud logos are added by an external
program and are not part of the DAT code. This is, therefore, a limitation of
the external program and not of the part itself.
2.) The part itself is flawed in that the studs are mirrored. We should redo
all the mirrored parts with stud in such a way that the studs are not mirrored.
My question to the reader of this post is:
What do you prefer?
I'm axious to get a resolution on this since many otherwise good part are being
held up because of this issue.
-Orion
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Message has 8 Replies:
 | | Re: Mirrored parts and studs [DAT]
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| (...) I favour the following scenario - put the part detail in a subpart, but the studs themselves in the main part files. s\xxxxs01.dat bulk of part excluding decorated surfaces and studs (handedness of lowest numbered part) xxxx.dat 1 0 0 0 1 0 0 (...) (21 years ago, 1-Jul-03, to lugnet.cad.dev)
| | | Re: Mirrored parts and studs
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| (...) I'm not going to comment on the actual question, but I want to make it clear that LDView should NOT display the logo mirrored, ever. It automatically detects that the stud has been mirrored, and mirrors the logo back to its correct (...) (21 years ago, 1-Jul-03, to lugnet.cad.dev)
| | | Re: Mirrored parts and studs
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| (...) Good summation. My preference is 1... a sufficiently clever convertor could perhaps detect this rotation and use rotated versions of the studs that it substitutes somehow in a preprocess step??? If there is a way to do 2 (perhaps with a (...) (21 years ago, 1-Jul-03, to lugnet.cad.dev)
| | | Re: Mirrored parts and studs
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| (...) LDView does not have a problem with mirrored studs. (...) Right! See my posting (URL) Cobbs also explains it well in (URL) 2.) The part itself is flawed in that the studs are mirrored. We should redo (...) Though I acknowledge that L3P should (...) (21 years ago, 1-Jul-03, to lugnet.cad.dev)
| | | Re: Mirrored parts and studs [DAT]
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| (...) **snip** (...) Ah, the perennial question. During a past discussion of this very topic I offered what I thought to be a semi-workable option similar to #2 above, which I reiterate in the interest of further stirring the pot: We could redo the (...) (21 years ago, 1-Jul-03, to lugnet.cad.dev)
| | | Re: Mirrored parts and studs
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| (...) My view is that there is nothing _serious_ wrong, but that a fix should be welcome. Anyway. Since we are only talking about studs, the rendering programs _could_ simply remember to fix any mirrored studs (can be done by multiplying the (...) (21 years ago, 1-Jul-03, to lugnet.cad.dev)
| | | Re: Mirrored parts and studs
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| (...) That is my opinion. The programs should be changed, rather than the parts. One thing to consider: even if we 'fix' all the part files so that all studs render non-mirrored logos, mirrored logos can still occur. For example, if someone created (...) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
| | | Re: Mirrored parts and studs
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| Just for kicks and grins.(not!) I'll throw in my $1.25 (...) This may have resurfaced because of the studs with logo files on my webpage. It was a quick thought I came up with a couple years ago. I guess I should remove them and any references to (...) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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