Re: Wishes

From: Michael Brindley, Rick Lott (Hughes Aircraft Company)
Date: Thursday, January 19, 1995

From: Michael Brindley, Rick Lott (Hughes  Aircraft Company)
To: Rick Lott (Hughes  Aircraft Company), RP-ML
Cc: RP-ML
Date: Thursday, January 19, 1995
Subject: Re: Wishes 
>      4.  To be able to split an .STL file with workstation software.
     What do you mean by "split"?  Break a single large part into smaller
pieces (so it can be built in sections and reassembled later)?  
Seperate multiple distinct objects in one STL file into seperate
files?  etc.?

>      6.  3-D Systems on Internet -- especially since they no longer support 
>      their bulletin board.
     And then they could put standards documents (STL file format ...), test
parts, etc. up for ftp/WWW transfers.  This summer at Dayton Dr. Jacobs
said that they had just gotten on Internet (email, anyway) and had no
time table for other things like ftp sites.

>      11.  I wish PartMan would recoginize a support file by the "_s.stl" 
>      designation and plug in a default support parm.
     Note: a file name is not adequate identification for data.  All data
should be tagged - as an integral part of the file format.  Then, 
it would be trivial for the software to recognize that this is supposed
to be a support, and take appropriate action.  This is a pet 'crusade'
of mine.  I'll stop here before I start frothing at the mouth.  :)

>      4.  To be able to remove "hidden lines" when viewing a .STL file so 
>      near-facing surface triangles can be examined.
     A full hidden line/surface removal is a lot of work for the computer
and the programmer(s).  Back-face culling, on the other hand is very
simple and requires little additional work for the computer.  Doesn't
3D's viewing software at least allow back-face culling?  I saw
Stratasys's software this summer, and it looked very nice.  I think
they are selling it seperately from the machines ...

  --> Mike Brindley

Reply
Date: Fri, 20 Jan 95 07:54:22 PST
> What do you mean by "split"?  Break a single large part into
> smaller pieces (so it can be built in sections and reassembled      
> later)?  Seperate multiple distinct objects in one STL file into   
> seperate files?  etc.?
     Sure, ok, sounds good.  All the above.  Why not?  A simple cutting 
     plane would be a good start, but to be able to isolate 
     non-intersecting solids would be real good too.


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