RE: [Plib-devel] DXF R12 Polyline question
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RE: [Plib-devel] DXF R12 Polyline question
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From: Dave M. <Dav...@dy...> - 2000-03-29 23:02:08
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oops. there are 8x4 = 32 vertex entities supplied so i guess i don't
need size or spacing. still don't know what "closure" means. anyone
want to guess?
-----Original Message-----
From: pli...@li...
[mailto:pli...@li...]On Behalf Of Dave McClurg
Sent: Wednesday, March 29, 2000 10:52 AM
To: 'pli...@li...'
Subject: [Plib-devel] DXF R12 Polyline question
I would like to support a special type of DXF POLYLINE entity
in PLIB called a polygon MxN mesh.
This is a uniform grid of 3d polygons with optional closure
of the mesh in the M, N or M&N directions.
The following fragment is from a chair DXF file that Wolfram
gave me and defines a 8 x 4 polygon mesh closed in the M direction.
Can anyone tell me how to determine the spacing and size of the grid.
I'm not sure how to generate triangles from this.
VPORT defines
15
0.1
25
0.1
which could indicate grid spacing but does that apply to all grids
in the file? even so, what is the size of the grid? are the vertex
coords in the polyline the center or side of the grid? what does
closed mean? hmmmm.
I can send you the entire DXF if interested. I've looked through
several DXF specs online but I'm kind of stumped right now.
Thanks,
--Dave McClurg
POLYLINE
8
LEG
66
1
10
0.0
20
0.0
30
0.0
70
17
71
8
72
4
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.514997
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.514997
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.727779
20
12.558272
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.727779
20
12.558272
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.771053
20
12.662745
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.771053
20
12.662745
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.727779
20
12.767218
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.727779
20
12.767218
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.810492
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.810492
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.518833
20
12.767218
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.518833
20
12.767218
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.475559
20
12.662745
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.475559
20
12.662745
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.518833
20
12.558272
30
-16.954128
70
64
0
VERTEX
8
LEG
10
-1.518833
20
12.558272
30
-17.454128
70
64
0
VERTEX
8
LEG
10
-1.623306
20
12.662745
30
-17.454128
70
64
0
SEQEND
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