 | | Re: Clipping / CCW / CW / INVERT
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(...) Thanks! (...) I knew that ! ;) (...) LDraw doesn't, but this specification is for new Programs which are backwards compatible with Ldraw, but with a bunch of new enhancements. Check the instructions of any LEGO MODEL and you will see an (...) (25 years ago, 8-Oct-99, to lugnet.cad.dev)
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| | Re: CW/CCW, vertex sequence, co-planar, convex
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Lars mentions the problem of "uncertified" parts using "certified" primitives. Is it so much of a problem? <much thinking> I can't find any other easy solution than using different names for the "certified" versions of the _primitives_. That way we (...) (25 years ago, 8-Oct-99, to lugnet.cad.dev)
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| | Re: CW/CCW, vertex sequence, co-planar, convex
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Gary Williams wrote in message ... (...) Well, inside/outside-ness also counts. It doesn't make sense to certify a part before ALL its subfiles have defined what is inside/outside. Until then you cannot determine whether or not you need any INVERTS. (...) (25 years ago, 8-Oct-99, to lugnet.cad.dev)
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| | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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Gary Williams wrote in message ... (...) I agree with Gary that mirroring should not turn subfiles inside-out. The rendering program should correct (C)CW-ness by looking at the transformation. Part authors should use the INVERT for explicitly (...) (25 years ago, 8-Oct-99, to lugnet.cad.dev)
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| | Re: Comprehensive meta-command list
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Gary Williams wrote in message ... (...) Well, my assumption was that CCW was the default and that the current facing was passed to the subfile. Under these circumstances I think that my two examples are equivalent! But I admit that the idea that (...) (25 years ago, 8-Oct-99, to lugnet.cad.dev)
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| | Re: Clipping / CCW / CW / INVERT
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(...) I believe this is incorrect, no? ALL transparent surfaces should appear, if only to make a contribution to the color that underlying surfaces appear to be (consider a trans blue surface in front of a trans yellow in front of a white... ) (...) (25 years ago, 7-Oct-99, to lugnet.cad.dev)
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| | Re: Clipping / CCW / CW / INVERT
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Lots of good stuff in your post, Rui! (...) (Side note: there are not actually any solids in LDraw. Only lines and polygons). (...) Actually, since LDraw doesn't do shading, transparent surfaces *can* be clipped. Only edges, the top-most solid (...) (25 years ago, 7-Oct-99, to lugnet.cad.dev)
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| | Re: Hidden surface removal, and vertex order in part/primitive DAT files
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(...) Thank you very much! Steve (25 years ago, 7-Oct-99, to lugnet.cad.dev)
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| | Re: Hidden surface removal, and vertex order in part/primitive DAT files
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(...) Sun's implementations are free. Some others are not. Personally I use Sun's jdks... Have a look at: (2 URLs) you are under a Windows environment As a reply to Leonardo msg: You are right, but I encourage newcomers to the Java language to use (...) (25 years ago, 6-Oct-99, to lugnet.cad.dev)
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| | Re: Hidden surface removal, and vertex order in part/primitive DAT files
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(...) In this sense we agree! It would be a shame if after a so long emails exchange we didn't ;-) (...) I read .dat files in the std LDraw folders, and simply output oriented .dat files in another one. For duplicate instances, I use a folder name (...) (25 years ago, 6-Oct-99, to lugnet.cad.dev)
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| | Clipping / CCW / CW / INVERT [DAT]
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First, let me apologise, if you get this message twice. It seams that the old e-Mail address (L-CAD@LISTSERV.UH.EDU) does not work completelly. Because I got the message back, but couldn't see it in www.lugnet.com/cad/dev note: i am subscribed in (...) (25 years ago, 6-Oct-99, to lugnet.cad.dev)
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| | Re: Hidden surface removal, and vertex order in part/primitive DAT files
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(...) My code worked too but my point was to say that the part is not correct, there could be some cases where it won't work and besides that, it won't look good if you render it with a program that has backface culling. How are you going to save (...) (25 years ago, 6-Oct-99, to lugnet.cad.dev)
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| | Re: Hidden surface removal, and vertex order in part/primitive DAT files
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(...) I guess you can download one from (URL) (25 years ago, 6-Oct-99, to lugnet.cad.dev)
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| | Re: Hidden surface removal, and vertex order in part/primitive DAT files
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(...) OK, then help out a Java-dummy: are there JDK's available on the net, or are they purchase-only? Steve (25 years ago, 6-Oct-99, to lugnet.cad.dev)
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| | Is the windscreen from set 4564 in ldraw?
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I swear I saw a pov-ray rendering using this piece. It might have been made using another pov-ray library but I swear it had that piece. What is the part # of this part? Just so there is no confusion the rendering definatly was not using the boat (...) (25 years ago, 6-Oct-99, to lugnet.cad.dev)
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| | Re: MI/X (Was: LeoCAD for Linux (Was: Compiling MPD Builder/Splitter for DOS/Win?))
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(...) Trouble...not sure. (...) (URL) all OSS, so it makes life easier. I beleive (don't know) that the VNC client for Mac is stable, it's just the server that is beta. You'll need the matching packages for your linux system. They come in .deb and (...) (25 years ago, 5-Oct-99, to lugnet.off-topic.geek, lugnet.cad, lugnet.cad.dev)
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| | Re: Hidden surface removal, and vertex order in part/primitive DAT files
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(...) I choose rays so that they may orient one face. With this face I use a sort of flood-fill algorithm (please try to find on of my previuos message) to orient al neighbors. Once a face is oriented, I don't look at it anymore. But, your idea (...) (25 years ago, 5-Oct-99, to lugnet.cad.dev)
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| | Re: Hidden surface removal, and vertex order in part/primitive DAT files
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(...) Sorry Leonardo, but I checked 105 again my code: it does the right job! Ok, you can argue it's pure luck. In fact, it is! If a ray went through the hole between the flag and the rest of the piece, my code would invert the flag orientation. (...) (25 years ago, 5-Oct-99, to lugnet.cad.dev)
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| | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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Steve Bliss wrote in message <37f9f5c6.74291430@l...et.com>... (...) not (...) inversion. (...) For WizardCAD I was intending to change the behavior of the mirror functions depending on what type of file the user opened the file as. If they open a (...) (25 years ago, 5-Oct-99, to lugnet.cad.dev)
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| | Re: Track names (was Re: To Tore Eriksson)
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(...) Don´t bother to dig the set up. Tore found an instuction scan at (URL) it clearly shows that the track parts from this set also have slots in them. Greetings, Manfred Moolhuysen. (25 years ago, 5-Oct-99, to lugnet.cad.dev)
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| | Re: Comprehensive meta-command list
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(...) The last three parameters define a vector, not angles. The nested commands are rotated <angle> degrees around the vector. To rotate 45 degrees around X, do: 0 ROTATE 45 1 0 0 ... To rotate -45 degress around Y, you can do this: 0 ROTATE 45 0 (...) (25 years ago, 5-Oct-99, to lugnet.cad.dev)
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| | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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(...) True. But mirroring is an advanced technique. Well, maybe intermediate-level. Anyway, it's not for beginners. (...) True. Allowing mirroring/inversion for parts authors allows them to use a single set of primitives, while keeping part-files (...) (25 years ago, 5-Oct-99, to lugnet.cad.dev)
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| | Re: Track names (was Re: To Tore Eriksson)
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(...) You could not find it with that loose and sloppy description! :-) (URL) Sorry about that! (...) You're right, slots are a better name than notches for the openings. However I would say that "tabs" are a better name for the part on the sleeper (...) (25 years ago, 5-Oct-99, to lugnet.cad.dev)
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| | Re: Comprehensive meta-command list
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I've got a zillion bug reports about mpds to sort through. Hopefully it will handle them better than 1.6 :). -gyug (...) (25 years ago, 5-Oct-99, to lugnet.cad.dev)
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| | Re: Comprehensive meta-command list
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(...) Great! Out of curiousity, how well does the upcoming version of LDlite (1.7 isn't it?) handle MPDs? --Bram Bram Lambrecht / o o \ BramL@juno.com ---...---oooo-----(_...o---...--- WWW: (URL) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: Interpreting the proposed FACE meta-command
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Steve Bliss wrote in message <37f8c4a9.238320530@...et.com>... (...) Well, I have nothing against anticlockwise, but it's redundant. Seeing ACW where one expects CW or CCW may confuse some people. I checked the dictionary because I honestly didn't (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: Comprehensive meta-command list
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Paul Gyugyi: [ kind of announced the next LDLite version ] Cool. Jacob (who should try to get LDLite to run on Linux) ---...--- -- E-mail: sparre@cats.nbi.dk -- -- Web...: <URL:(URL) -- ---...--- (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: Track names (was Re: To Tore Eriksson)
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(...) 4555? (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: CW/CCW, vertex sequence, co-planar, convex
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John VanZwieten wrote in message ... (...) Actually, I count three ideas. (...) messy. (...) when (...) the (...) to (...) only (...) have (...) in (...) CW (...) slightly (...) for (...) The third option, which I believe would be best, is similar (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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Steve Bliss wrote in message <37f8c86b.239282689@...et.com>... (...) But more often than not, when mirroring an element or subassembly, it's not the intent of the author to turn it inside out. Typical model builders shouldn't concern themselves (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: Comprehensive meta-command list
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Paul Gyugyi wrote in message <37F8CE0C.13D582C9@g...yi.com>... (...) Cool! This could be very handy. I'll add it to the DAT format page I'm writing. -Gary (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: Comprehensive meta-command list
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Lars C. Hassing wrote in message <939050465.592693@ns.cci.dk>... (...) True. But when manually examining a file, if you come across a 0 INVERT you wouldn't know whether this was the beginning or the end of the inverted references, without a bit of (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: CW/CCW, vertex sequence, co-planar, convex [DAT]
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It seems to me that there are two major "camps" in the CW/CCW debate. A. Face-by-Face Method This method suggests that CW-ness be ultimately evaluated on a face-by-face basis. Each quad in a primitive or part would hold a value of CW,CCW, or (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: Comprehensive meta-command list
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(...) True. '0 INVERT END' may be allowed as a syntactic convenience to authors. Or 0 INVERT could be rewritten as 0 INVERT [ON|OFF|TOGGLE] where TOGGLE would be the default action. (...) [example snipped] 0 INVERT is different from 0 FACE [CW|CCW] (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: Comprehensive meta-command list
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(...) Hooray! :) (...) Hooray! :) Steve (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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Jacob: (...) Steve: (...) Jacob: (...) It happens every once in awhile. Actually, which approach *would* be better? Examining the transformation matrix to determine the state of inversion, and adjusting the CW/CCW setting to correct for it, would (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: Interpreting the proposed FACE meta-command
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(...) Recognizing multiple forms of the command shouldn't add much to rendering. Each file can be parsed once, and then the post-parsing results cached, for later re-reference. The FACE meta-command would be stored as an opcode and a single (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: Hidden surface removal, and vertex order in part/primitive DAT files [DAT]
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(...) Forgot the footnote: 1- There's an interesting distinction between 'valid' and 'well-formed' contructions. LDraw will allow line-breaks as whitespace in commands, so: 1 16 0 0 0 1 0 0 0 1 0 0 0 1 3001.dat is valid, but it's not well-formed. (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Re: Comprehensive meta-command list
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Steve: (...) Yes. (...) Yes. Play well, Jacob ---...--- -- E-mail: sparre@cats.nbi.dk -- -- Web...: <URL:(URL) -- ---...--- (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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| | Track names (was Re: To Tore Eriksson)
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(...) I'm curious Chris, in what sets was that the case ? And do these gray ones have those "negative" tapered ends, just like the old blue track had ? In lugnet.cad.dev, Larry Pieniazek writes: (...) Gimme a set number for "the wildwest miningish" (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
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