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   AbderRahman N Sobh @ 10:07 am on 15 Mar 2016

   Our formatting for recognizing .obj files is very strict and not robust. Basically, it has to follow the format that Blender creates for .obj files. Different programs may use a different format of .obj file which will not work here. Also, to be converted we have a set of rules that are listed in the DDAConvert tool:
   - The mesh must be triangular
   - The mesh must be closed (ie. a sheet would not work, but a rectangular prism would).
   - Multiple, separate meshes each defining separate objects may be used in conjunction with the corresponding option.
   - Files with multiple objects must have distinct vertices, faces, object names for each object to be recognized.
   
    I can see already that the data for the object faces, in the lines that start with "f" (i.e. f 72//60 71//60 86//60 87//60) should not have these slashes. Also, if the mesh is triangulated it should simply be only 3 entries per line (i.e. a good line of this type would look like "f 10 12 11")
    

   The rest of the obj file looks fine, I believe. Below is an example obj file so you can see the correct formatting:

   # Blender v2.71 (sub 0) OBJ File: 'Cylinder.blend'
   # www.blender.org
   mtllib Cylinder.mtl
   o Cylinder
   v 1.000000 0.000000 -1.000000
   v 2.000000 -0.000000 -1.000000
   v 1.000000 -0.195090 -0.980785
   v 2.000000 -0.195091 -0.980785
   v 1.000000 -0.382683 -0.923880
   v 2.000000 -0.382684 -0.923880
   v 1.000000 -0.555570 -0.831470
   v 2.000000 -0.555571 -0.831470
   v 1.000000 -0.707106 -0.707107
   v 2.000000 -0.707107 -0.707107
   v 0.999999 -0.831469 -0.555570
   v 2.000000 -0.831470 -0.555570
   v 0.999999 -0.923879 -0.382683
   v 1.999999 -0.923880 -0.382683
   v 0.999999 -0.980785 -0.195090
   v 1.999999 -0.980786 -0.195090
   v 0.999999 -1.000000 -0.000000
   v 1.999999 -1.000000 -0.000000
   v 0.999999 -0.980785 0.195090
   v 1.999999 -0.980786 0.195090
   v 0.999999 -0.923879 0.382683
   v 1.999999 -0.923880 0.382683
   v 0.999999 -0.831469 0.555570
   v 2.000000 -0.831470 0.555570
   v 1.000000 -0.707106 0.707107
   v 2.000000 -0.707107 0.707107
   v 1.000000 -0.555570 0.831470
   v 2.000000 -0.555570 0.831470
   v 1.000000 -0.382683 0.923880
   v 2.000000 -0.382684 0.923880
   v 1.000000 -0.195090 0.980785
   v 2.000000 -0.195090 0.980785
   v 1.000000 0.000001 1.000000
   v 2.000000 0.000000 1.000000
   v 1.000000 0.195091 0.980785
   v 2.000000 0.195090 0.980785
   v 1.000000 0.382684 0.923879
   v 2.000000 0.382684 0.923879
   v 1.000000 0.555571 0.831469
   v 2.000000 0.555570 0.831469
   v 1.000000 0.707108 0.707106
   v 2.000000 0.707107 0.707106
   v 1.000000 0.831470 0.555570
   v 2.000000 0.831470 0.555570
   v 1.000001 0.923880 0.382683
   v 2.000000 0.923880 0.382683
   v 1.000001 0.980786 0.195089
   v 2.000001 0.980785 0.195089
   v 1.000001 1.000000 -0.000001
   v 2.000001 1.000000 -0.000001
   v 1.000001 0.980785 -0.195091
   v 2.000001 0.980785 -0.195091
   v 1.000001 0.923879 -0.382684
   v 2.000000 0.923879 -0.382684
   v 1.000000 0.831469 -0.555571
   v 2.000000 0.831469 -0.555571
   v 1.000000 0.707106 -0.707108
   v 2.000000 0.707106 -0.707108
   v 1.000000 0.555569 -0.831470
   v 2.000000 0.555569 -0.831470
   v 1.000000 0.382682 -0.923880
   v 2.000000 0.382682 -0.923880
   v 1.000000 0.195089 -0.980786
   v 2.000000 0.195089 -0.980786
   usemtl None
   s off
   f 2 4 3
   f 4 6 5
   f 6 8 7
   f 8 10 9
   f 10 12 11
   f 12 14 13
   f 14 16 15
   f 16 18 17
   f 18 20 19
   f 20 22 21
   f 22 24 23
   f 24 26 25
   f 26 28 27
   f 28 30 29
   f 30 32 31
   f 32 34 33
   f 34 36 35
   f 36 38 37
   f 37 38 40
   f 40 42 41
   f 42 44 43
   f 44 46 45
   f 46 48 47
   f 48 50 49
   f 49 50 52
   f 52 54 53
   f 53 54 56
   f 56 58 57
   f 57 58 60
   f 60 62 61
   f 38 22 6
   f 64 2 1
   f 62 64 63
   f 31 47 15
   f 1 2 3
   f 3 4 5
   f 5 6 7
   f 7 8 9
   f 9 10 11
   f 11 12 13
   f 13 14 15
   f 15 16 17
   f 17 18 19
   f 19 20 21
   f 21 22 23
   f 23 24 25
   f 25 26 27
   f 27 28 29
   f 29 30 31
   f 31 32 33
   f 33 34 35
   f 35 36 37
   f 39 37 40
   f 39 40 41
   f 41 42 43
   f 43 44 45
   f 45 46 47
   f 47 48 49
   f 51 49 52
   f 51 52 53
   f 55 53 56
   f 55 56 57
   f 59 57 60
   f 59 60 61
   f 2 64 4
   f 64 58 54
   f 62 60 58
   f 58 56 54
   f 54 52 50
   f 46 38 48
   f 42 38 44
   f 42 40 38
   f 38 36 34
   f 34 32 30
   f 30 28 26
   f 26 24 22
   f 18 16 20
   f 14 22 16
   f 14 12 10
   f 10 8 6
   f 64 6 4
   f 6 64 54
   f 22 14 10
   f 16 22 20
   f 30 22 34
   f 30 26 22
   f 61 62 63
   f 6 22 10
   f 38 46 44
   f 50 38 6
   f 38 50 48
   f 64 62 58
   f 54 50 6
   f 63 64 1
   f 22 38 34
   f 63 1 3
   f 3 5 7
   f 31 35 37
   f 15 9 13
   f 15 17 19
   f 23 25 21
   f 27 31 25
   f 27 29 31
   f 31 33 35
   f 39 31 37
   f 39 41 43
   f 43 45 47
   f 47 49 51
   f 53 63 15
   f 55 57 59
   f 59 61 63
   f 63 3 7
   f 9 15 63
   f 25 15 21
   f 25 31 15
   f 47 51 53
   f 39 43 47
   f 53 55 63
   f 55 59 63
   f 7 9 63
   f 9 11 13
   f 31 39 47
   f 15 19 21
   f 47 53 15
   o Cube
   v 1.000000 -2.250000 -2.249999
   v 1.000000 -2.250000 2.249999
   v -1.000000 -2.250000 2.249999
   v -1.000000 -2.250000 -2.250000
   v 1.000000 2.250000 -2.249998
   v 0.999999 2.250000 2.250000
   v -1.000000 2.250000 2.249998
   v -1.000000 2.250000 -2.249999
   usemtl Material
   s off
   f 66 67 68
   f 72 71 70
   f 69 70 66
   f 70 71 67
   f 71 72 68
   f 65 68 72
   f 65 66 68
   f 69 72 70
   f 65 69 66
   f 66 70 67
   f 67 71 68
   f 69 65 72

    

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