To LUGNET HomepageTo LUGNET News HomepageTo LUGNET Guide Homepage
 Help on Searching
 
Post new message to lugnet.cad.devOpen lugnet.cad.dev in your NNTP NewsreaderTo LUGNET News Traffic PageSign In (Members)
 CAD / Development / 10501
     
   
Subject: 
Re: LDraw coordinate system driving me crazy
Newsgroups: 
lugnet.cad.dev
Date: 
Sun, 19 Nov 2006 06:19:32 GMT
Viewed: 
2837 times
  

As I understand it, LDraw has negative y in the up direction, which is neither
right nor left handed, but something else entirely.  I don't know that it has a
name.

James

   
         
   
Subject: 
Re: LDraw coordinate system driving me crazy
Newsgroups: 
lugnet.cad.dev
Date: 
Sun, 19 Nov 2006 11:00:26 GMT
Viewed: 
2871 times
  

In lugnet.cad.dev, James Reynolds wrote:
As I understand it, LDraw has negative y in the up direction, which is neither
right nor left handed, but something else entirely.  I don't know that it has a
name.

James


It is still a right-handed system. The handedness is unchanged by rotation (in
ldraws case 180*x from standard).

Tim

   
         
   
Subject: 
Re: LDraw coordinate system driving me crazy
Newsgroups: 
lugnet.cad.dev
Date: 
Sun, 19 Nov 2006 19:48:44 GMT
Viewed: 
2917 times
  

Tim Gould wrote:
  > It is still a right-handed system. The handedness is unchanged by
rotation (in
ldraws case 180*x from standard).

Tim

So the original designer of the LDraw program just decided to use this
orientation of the right handed system. if so then it starts making more
sense to me, I just need to redefine 'front, left, right etc' to fit in
this orientation for editing.

I'll make it an option (LDraw orientation 'standard' orientation).
Because personally I find a upward negative Y very confusing, but I
suspect that the LDraw die hards are custom to it.

But in essence no changes are made to the coordinates (only the camera
position), so it doesn't really matter how you label the sides :)


Roland

 

©2005 LUGNET. All rights reserved. - hosted by steinbruch.info GbR