/usr/share/dx/samples/data/FacesLoopsEdges.dx is in dxsamples 4.4.0-3.
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# Example of faces, loops and edges components.
# This example has no holes.
#
#
# Positions array. These are a list of all the verticies of the object;
# no particular order is required here.
#
object "position list" class array type float rank 1 shape 2 items 11
data follows
0.133985 0.812452 # point number 0
0.375019 0.896258 # point number 1
0.532733 0.76484 # point number 2
0.523806 0.404777 # point number 3
0.300626 0.327407 # point number 4
0.145888 0.508927 # point number 5
0.68152 0.851137 # point number 6
0.815428 0.758889 # point number 7
0.94636 0.592248 # point number 8
0.729132 0.416679 # point number 9
0.535709 0.190524 # point number 10
#
# Edges array. This is a list of connected points, by point number. All
# the edges associated with a particular face need to be listed together.
# If points 10, 3 and 7 make a triangle, the list is "10 3 7" and the 10
# is not repeated.
# Note that below, for readability, the connected points for
# each loop are shown together. However, line breaks are not
# significant to the importer, and all of the following numbers
# could have been on the same line, or one to a line, with the
# same result.
object "edge list" class array type int rank 0 items 21 data follows
1 2 6 # edge point index 0
0 5 4 3 2 1 # edge point index 3
2 3 9 8 7 6 # edge point index 9
3 10 9 # edge point index 15
3 4 10 # edge point index 18
attribute "ref" string "positions"
#
# Loops array. This is a list of connected edges, by edge number. Each
# number is the edge index of where the next loop starts.
object "loop list" class array type int rank 0 items 5 data follows
0 # loop index 0
3 # 1
9 # 2
15 # 3
18 # 4
attribute "ref" string "edges"
#
# Faces array. This is list of which loops make faces. If there are
# no holes in the faces, this is list of all loops. If two or more
# loops actually describe the outside edges and inside hole edges of
# a face, then this list contains the starting loop numbers of the
# list of loops making up a face.
#
object "face list" class array type int rank 0 items 5 data follows
0
1
2
3
4
attribute "ref" string "loops"
#
# data array. Dependent on faces.
#
object "data" class array type float rank 0 items 5 data follows
0 2.5 1.2 0.4 1.8
attribute "dep" string "faces"
#
#
# Field definition to put the arrays together.
#
object "map" class field
component "positions" "position list"
component "edges" "edge list"
component "loops" "loop list"
component "faces" "face list"
component "data" "data"
end
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