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anytooff is off by a dimension (again)

  • To: software
  • Subject: anytooff is off by a dimension (again)
  • From: roseman
  • Date: Sat, 23 Jan 93 15:06:30 -0600

Currently I  get the following behavior my (3d) VECT is turned to a 4OFF:

julia 67% more ve
# this a path forming a  "v"
1    3  0  # there are 1 polypaths, 3 vertices, 0 colors
3  # the 3 verticies on each line
0   # the number of colors on these paths
0   0   0  # now here come the vertex coordinates
1   1   0
0   2   0

julia 68% /u/gcg/ngrap/bin/next/anytooff <ve> ve.off
julia 69% more ve.off
3 2 3

0 0 0 1
1 1 0 1
0 2 0 1

2        0 1
2        1 2

Is this intentional ? If so it is not documented.

Neither in:

     Anytooff reads a geom from standard in and outputs  the  new
     polylist to standard out."

nor in

"  When vector objects are switched into  polylists,  they  are
     transformed  into  polygons with two vertices.  The faces of
     the polygons are the same color as the  given  vectors,  but
     the  edges  of  the  polygons,  which are their only visible
     aspect, have no color."

Personally it seems wrong to me and I've wasted a lot of time (yet again) on this stuff.  This  
is not the first time I've had problems with anytooff making 3d input into 4OFFs.  I am very  
concerned with the distinction between a point in Euclidian 4-space and a point in  
3d-space as represented in 4 homogeneous coords. 

(I know it looks the same on the screen in geom view)  But what if one wants to use  
anytooff to pipe it as input to some other program one is writing that might turn this into  
another geom, etc.  Then having this 4OFF appear will be un-anticipated. 



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