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 CAD / Development / *3595 (-20)
  Re: Line in the Sand
 
(...) Yes. How are you on travel? :-) (25 years ago, 21-Oct-99, to lugnet.cad.dev)
 
  Re: Several replies to CLIPPING / WINDING
 
(...) Sorry, you are right here. I allways think in some form of winding (CW or CCW) so this one slipped me, once again sorry, you are right. Can't assume nothing. (...) what I said was relative to my way of thinking, without the previous sentence, (...) (25 years ago, 21-Oct-99, to lugnet.cad.dev)
 
  Re: Line in the Sand
 
(...) Thanks. (blushing) Can that be translated into paying work? (...) That's because it's written by someone who keeps the matrix-math reference material very close at hand whenever he's got to actually go under the hood. (...) Issue 1: should the (...) (25 years ago, 21-Oct-99, to lugnet.cad.dev)
 
  Re: Object Orientation & DAT files & CLIPPING/WINDING
 
(...) You are right. Or more precisely, I was wrong. Matrix-based *inversions* are not required. But matrix-based mirrorings will be necessary, for asymmetric primitives, like 1-4cyls.dat. (...) I was thinking about some approach that would map (...) (25 years ago, 21-Oct-99, to lugnet.cad.dev)
 
  Re: Line in the Sand
 
Gary Williams wrote in message ... (...) a (...) Well, what I meant to say is: Matrices with negative determinants may be used for mirroring a part, BUT the matrix should never be assumed to perform the actual inversion. If a matrix has a negative (...) (25 years ago, 21-Oct-99, to lugnet.cad.dev)
 
  Re: Line in the Sand
 
Steve Bliss wrote in message <380e2b8e.12563517@l...et.com>... (...) An orientation matrix doesn't contain enough information to invert an asymmetrical part; if you assume it does, this would result in a part with a mirrored shape. I propose that (...) (25 years ago, 21-Oct-99, to lugnet.cad.dev)
 
  Re: Line in the Sand
 
Steve Bliss wrote... (...) Good idea, it's hard to discuss in so many threads. (...) Thank you for the well-written summary. Well-written because I agree with 99% of it ;) (...) Yes, too bad I'm off for an Internet-free :( 4-day week-end at the sea (...) (25 years ago, 21-Oct-99, to lugnet.cad.dev)
 
  Re: Line in the Sand
 
(...) I would. This is WAY better than most of the crap requirements I have to rationalize into some semblance of something to keep paying customers happy. Very nice work, Steve. Written in a way that made it understandable to someone that doesn't (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Re: Object Orientation & DAT files & CLIPPING/WINDING  [DAT]
 
Steve Bliss wrote... (...) "Hey, (...) But it *is* compatible with LDraw! You left out my example (which BTW had the INVERT placed incorrectly :-), so I'll repeat it. stud2.dat is the hollow stud used on technic bricks. It uses two cylinders: 1 16 0 (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Line in the Sand
 
OK, we've been discussing how to best extend the LDraw language to allow rendering engines to do backface-culling. We've got a pretty good agreement on most of what is needed. I think it would be productive, at this point, to work from a complete (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Minifigure Torso Generator
 
Hi , at 19.10.99 Jonathan Wilson wrote in a mail: JW> The password is modelling (mabie that should be in the faq? Maybe. There I had realy not been looking for a password, my fault. JW> -- Jonathan Wilson wilsonj@xoommail.com JW> (URL) Joachim. (URL) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Re: Several replies to CLIPPING / WINDING
 
(...) No. With current files, you don't know, so you can't assume anything. (...) No, inversions are common. (...) Right. So non-wound-up files can't be backface culled. I don't see what you're getting at here. (...) But we don't get to specify what (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Re: Several replies to CLIPPING / WINDING
 
(...) This is a problem of the current design (the one beeing used now). You didn't knew in the past, because you didn't have the 0 INVERT meta-command. So you can only assume it' NOT inverted. If for some reason, it is inverted, then the old .DAT (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Re: Fixed #3228a is ready
 
I'm suffering from burnout working just half-time and therefore I have some time over. Had to look up the word "tapered" in my dictonary. That's my only faint objection. Thanks for your trouble, /Tore (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Re: Several replies to CLIPPING / WINDING
 
(...) That's not true. If a super-file is not certified, then there's no way to tell if the subfile is normal or inverted. So when a file is referenced by a non-certified super-file, it can't be clipped, even if the referenced file is certified. (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Re: Object Orientation & DAT files & CLIPPING/WINDING
 
(...) Great! (...) It's local when you look at it in the .DAT where it is used. It's effect is NOT local, when you are looking from the renderer program's view, because it has to keep track of the current invert state. The INVERT meta-command only (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Re: Object Orientation & DAT files & CLIPPING/WINDING
 
(...) Yes it is. (...) The reference of the current GLOBAL state is passed down the file-reference tree, YES. (...) Correct. (...) NOT the FILE, but the RENDERING PROGRAM ! (...) Agreed. (...) By default would be CCW. (...) YES and NO. The internal (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Re: Object Orientation & DAT files & CLIPPING/WINDING
 
(...) If by default you always use the same winding, then you can know the orientation of the polygon on the fly. IF you mix both you will have a hard time, because you are mixing or reference. (...) That I agree! but my NOTE (suggestion) to pair (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Re: Several replies to CLIPPING / WINDING
 
(...) Great ! (...) Don't be pessimistic ! As soon as people see that their models render twice as fast, they will start using the new features. And a utility to make the optimization job easier would make a big difference, to all the lazy people ;) (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)
 
  Re: Several replies to CLIPPING / WINDING
 
(...) That can be done, but you will probably suffer a performance hit, because, most hardware, just use a bit, to keep track of the state. Just minimize the use of the 0 CCW and 0 CW meta-commands, to boost performance. When optimizing existent or (...) (25 years ago, 20-Oct-99, to lugnet.cad.dev)


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