 | | Re: primer/tutorial on BFC?
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(...) I do this all the time, too. Just a minus sign in stead of 'BFC INVERTNEXT' each time can save some diskspace, which I've been told is something to go for, too. Niels (21 years ago, 3-Jan-04, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC? [DAT]
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(...) I think it works just fine. L3Lab correctly detects that the matrix is mirroring, see View/Tree View... and click the BFC radio button, it should say INVERT in front of the line. When we discussed the BFC business the general assumption was (...) (21 years ago, 3-Jan-04, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC?
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(...) If this is the case then we need to go back through all the BFC'd parts and find instances of this type of matrix. Since L3Lab allows inverting the sign of the Y component and it's currently the only program to easily check for correct (...) (21 years ago, 3-Jan-04, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC?
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(...) L3Lab supports BFC INVERTNEXT. /Tore (21 years ago, 3-Jan-04, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC? [DAT]
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(...) I do agree that it isn't supposed to work, because the BFC spec very carefully states that any polygons drawn with an aggregate matrix that causes mirroring must be flipped back. (...) I'm sorry that LDView is crashing your system, but it (...) (21 years ago, 3-Jan-04, to lugnet.cad.dev)
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| | Re: Need partnumbers and some partnames
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(...) There are trainbases with and without motorcutouts, some with the same size. That's why I suggested to add the cutout to the name. Also for seeking those parts as one of them is just a plate. Perhaps adding Motorcutout as a keyword can help to (...) (21 years ago, 31-Dec-03, to lugnet.cad.dev, FTX)
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| | Re: Need partnumbers and some partnames
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(...) x389.dat Technic Brick 1 x 2 with Hole and Thin Top x290.dat Magnet Holder for Train Base 6 x 22 Type I x303.dat Train Base 6 x 22 with Cutout Type I x303c01.dat Train Base 6 x 22 with Cutout Type I with Magnets (Complete) x304c01.dat ~Train (...) (21 years ago, 31-Dec-03, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC?
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In lugnet.cad.dev, Chris Dee wrote: [snip] One other thing: before you update a file for BFC, be sure there are no serious L3P errors -- vertex order is the big problem, but you should also take care of non-coplanar quads and singular matrices as (...) (21 years ago, 31-Dec-03, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC? [DAT]
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(...) That shouldn't work -- the rendering program should detect that you've mirrored the object, and adjust accordingly. Unfortunately, I see that it does 'work' in L3Lab. LDView is crashing my system right now, so I couldn't check it. What you (...) (21 years ago, 31-Dec-03, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC?
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(...) I started parts authoring without knowing about BFC. When I read something about BFC-ing here on lugnet, I started to dig myself into it, reading documentation (from www.ldraw.org), trying things out and now I know enough about it. I only (...) (21 years ago, 30-Dec-03, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC?
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(...) I use LDDP and L3Lab with "Poll to L3Lab & LDview" + "Poll to selected line only" turned on. going through the code with CRTL+W (orion please don't forget my special request) rewinding what's needed. w. (21 years ago, 30-Dec-03, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC? [DAT]
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(...) For the two-dimensional primitives (disc, ndis, ring, chrd) you can do the following: Say you have a disc in the x-z plane, like: 1 16 0 0 0 10 0 0 0 1 0 0 0 10 4-4disc.dat If this has the wrong BFC winding, you can just flip (mirror) the (...) (21 years ago, 30-Dec-03, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC?
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(...) I use Notepad (NOTEPAD.EXE), until the DAT file gets too huge, whereupon I use WordPad (WORDPAD.EXE) to continue editing the file. I use a calculator and scratch paper (to do a rough sketch and to keep notes of important locations). Whenever I (...) (21 years ago, 30-Dec-03, to lugnet.cad.dev)
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| | Need partnumbers and some partnames
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Now the parts update 2003-03 is released, I started to make some parts I have already created ready for upload to the parts tracker. I need partnumbers for the following parts. I also want to know if the partnames are correct. * Technic Brick 1 x 2 (...) (21 years ago, 29-Dec-03, to lugnet.cad.dev)
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| | Re: BFC And Mirroring (LDS)
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(...) Thanks Steve. :) (21 years ago, 29-Dec-03, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC?
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(...) OK - it's not a technique I use, but in an email conversation recently somebody convinced me that inverting the matrix would switch the winding. Now that I test it again I found I was mistaken. Chris (21 years ago, 28-Dec-03, to lugnet.cad.dev)
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| | Re: BFC And Mirroring (LDS)
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In lugnet.cad.dev, Tore Eriksson wrote: [snip] (...) Yes. Steve (21 years ago, 28-Dec-03, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC?
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In lugnet.cad.dev, Chris Dee wrote: [snip] Thanks for writing this up, Chris! Your explanation was very good in all respects except for one small point: (...) Actually, negating the transformation matrix should not invert any object; and even if it (...) (21 years ago, 28-Dec-03, to lugnet.cad.dev)
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| | Re: primer/tutorial on BFC?
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(...) I think ease or difficulty depends on which tools you use to author parts. I use LDAO as the editor with L3Lab for preview and find it reasonably easy. Others may wish to comment with reference to their favourite tools. To BFC an existing DAT (...) (21 years ago, 27-Dec-03, to lugnet.cad.dev)
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| | BFC And Mirroring (LDS)
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As I am into a major revision of the LDS Compiler, I have stumbled upon the problem with mirroring and extruding and their effect on BFD winding. My question is: Is it correct to rewind the points if a polygon has been mirrored an odd number of (...) (21 years ago, 27-Dec-03, to lugnet.cad.dev)
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