Next: Example 2: Implicit Up: LEDG: A Tool For Previous: Operation


Example 1: Constraints

Following is an example LEDG input file with 6 constraints:

-------------- begin included file --------------

dimensions 2 2 2
constrain x0
constrain x1
constrain y0
constrain y1
constrain z0
constrain z1
body 1
0 0 0
1 0 0
0 1 0
body 2
0 0 1
1 0 1
0 1 1
body 3
1 1 0
1 1 1
end

-------------- end included file --------------

And below is the evolver data file produced by it:

-------------- begin included file --------------

constraint 1 function x = 0.0
constraint 2 function x = 1.0
constraint 3 function y = 0.0
constraint 4 function y = 1.0
constraint 5 function z = 0.0
constraint 6 function z = 1.0

vertices
1  0.000000 0.000000 0.000000  constraint 1 3 5
2  0.500000 0.000000 0.000000  constraint 3 5
3  1.000000 0.000000 0.000000  constraint 2 3 5
4  0.000000 0.500000 0.000000  constraint 1 5
5  0.500000 0.500000 0.000000  constraint 5
6  1.000000 0.500000 0.000000  constraint 2 5
7  0.000000 1.000000 0.000000  constraint 1 4 5
8  0.500000 1.000000 0.000000  constraint 4 5
9  1.000000 1.000000 0.000000  constraint 2 4 5
10  0.000000 0.000000 0.500000  constraint 1 3
11  0.500000 0.000000 0.500000  constraint 3
12  1.000000 0.000000 0.500000  constraint 2 3
13  0.000000 0.500000 0.500000  constraint 1
14  0.500000 0.500000 0.500000 
15  1.000000 0.500000 0.500000  constraint 2
16  0.000000 1.000000 0.500000  constraint 1 4
17  0.500000 1.000000 0.500000  constraint 4
18  1.000000 1.000000 0.500000  constraint 2 4
19  0.000000 0.000000 1.000000  constraint 1 3 6
20  0.500000 0.000000 1.000000  constraint 3 6
21  1.000000 0.000000 1.000000  constraint 2 3 6
22  0.000000 0.500000 1.000000  constraint 1 6
23  0.500000 0.500000 1.000000  constraint 6
24  1.000000 0.500000 1.000000  constraint 2 6
25  0.000000 1.000000 1.000000  constraint 1 4 6
26  0.500000 1.000000 1.000000  constraint 4 6
27  1.000000 1.000000 1.000000  constraint 2 4 6

edges
1  1 2  constraint 3 5
2  2 3  constraint 3 5
3  4 5  constraint 5
4  5 6  constraint 5
5  7 8  constraint 4 5
6  8 9  constraint 4 5
7  10 11  constraint 3
8  11 12  constraint 3
9  13 14 
10  14 15 
11  16 17  constraint 4
12  17 18  constraint 4
13  19 20  constraint 3 6
14  20 21  constraint 3 6
15  22 23  constraint 6
16  23 24  constraint 6
17  25 26  constraint 4 6
18  26 27  constraint 4 6
19  1 4  constraint 1 5
20  2 5  constraint 5
21  3 6  constraint 2 5
22  4 7  constraint 1 5
23  5 8  constraint 5
24  6 9  constraint 2 5
25  10 13  constraint 1
26  11 14 
27  12 15  constraint 2
28  13 16  constraint 1
29  14 17 
30  15 18  constraint 2
31  19 22  constraint 1 6
32  20 23  constraint 6
33  21 24  constraint 2 6
34  22 25  constraint 1 6
35  23 26  constraint 6
36  24 27  constraint 2 6
37  1 10  constraint 1 3
38  2 11  constraint 3
39  3 12  constraint 2 3
40  4 13  constraint 1
41  5 14 
42  6 15  constraint 2
43  7 16  constraint 1 4
44  8 17  constraint 4
45  9 18  constraint 2 4
46  10 19  constraint 1 3
47  11 20  constraint 3
48  12 21  constraint 2 3
49  13 22  constraint 1
50  14 23 
51  15 24  constraint 2
52  16 25  constraint 1 4
53  17 26  constraint 4
54  18 27  constraint 2 4

faces
1  -19 37 25 -40  constraint 1
3  -21 39 27 -42  constraint 2
4  -22 40 28 -43  constraint 1
5  -23 41 29 -44 
6  -24 42 30 -45  constraint 2
7  -25 46 31 -49  constraint 1
9  -27 48 33 -51  constraint 2
10  -28 49 34 -52  constraint 1
11  -29 50 35 -53 
12  -30 51 36 -54  constraint 2
13  -37 1 38 -7  constraint 3
14  -38 2 39 -8  constraint 3
16  -41 4 42 -10 
17  -43 5 44 -11  constraint 4
18  -44 6 45 -12  constraint 4
19  -46 7 47 -13  constraint 3
20  -47 8 48 -14  constraint 3
22  -50 10 51 -16 
23  -52 11 53 -17  constraint 4
24  -53 12 54 -18  constraint 4
25  -1 19 3 -20  constraint 5
26  -2 20 4 -21  constraint 5
27  -3 22 5 -23  constraint 5
28  -4 23 6 -24  constraint 5
29  -7 25 9 -26 
30  -8 26 10 -27 
31  -9 28 11 -29 
33  -13 31 15 -32  constraint 6
34  -14 32 16 -33  constraint 6
35  -15 34 17 -35  constraint 6
36  -16 35 18 -36  constraint 6

bodies
1   1 13 25 -29 -3 14 -16 26 -30 4 -5 -17 27 -31 volume 0.375000
2   7 19 29 -33 -9 20 -22 30 -34 10 -11 -23 31 -35 volume 0.375000
3   5 -6 16 -18 28 11 -12 22 -24 -36 volume 0.250000

-------------- end included file --------------


Jim Hoffman
Tue Jun 18 17:16:40 PDT 1996