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 CAD / Development / Organizations / LDraw / 36
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Subject: 
Re: Lossless outlining (Was: [ldraw.org] Progress)
Newsgroups: 
lugnet.cad.dev, lugnet.cad.dev.org.ldraw
Date: 
Mon, 7 Jun 1999 14:00:09 GMT
Viewed: 
68 times
  
On Mon, 7 Jun 1999 07:06:40 GMT, Paul Gyugyi <paul@gyugyi.com> wrote:

The matrix math will not always invert, although if the matrix
is a pure rotation  (with no scaling or shears) the transpose
of the matrix is the inverse.
A better solution would be for the inliner to apply a start
and a stop tag for each inlined file. Perhaps "0 INLINE START "
followed by some pseudo-random string (like mime-enclosures, if you've
ever seen them in-the-raw). Surround the inlined file with
identical tags and have the first line be the commented-out
original.  In this way, the inlining operation would be completely
reversable.

Adding a closing tag (and unique ID) is a good idea, and something that
should have been done from the start.

It would solve the problem of identifying the chunk of code to reverse out,
and restoring the original referencing file would be do-able, but unless
the transform matrix is invertable, the original subfile can't be
recreated.

Or the inliner could be recoded to wrap LDLite's 0 TRANSFORM meta-statement
around the inlined code, instead of transforming the code directly.  That
would provide a completely reversible solution.  But it wouldn't be
LDraw-compatible. :(

Steve



Message has 1 Reply:
  Re: Lossless outlining (Was: [ldraw.org] Progress)
 
Steve Bliss wrote in message <375bc53d.299725817@...et.com>... (...) In which case MPD would be better anyway. (...) (25 years ago, 14-Jun-99, to lugnet.cad.dev, lugnet.cad.dev.org.ldraw)

Message is in Reply To:
  Re: Lossless outlining (Was: [ldraw.org] Progress)
 
The matrix math will not always invert, although if the matrix is a pure rotation (with no scaling or shears) the transpose of the matrix is the inverse. A better solution would be for the inliner to apply a start and a stop tag for each inlined (...) (25 years ago, 7-Jun-99, to lugnet.cad.dev, lugnet.cad.dev.org.ldraw)

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