Regarding Symmetry calculation

[ArghyaChatterjee]

Hi, I am trying to calculate symmetry for my objects to generate some dataset with dope and train.

Here are my objects:
Rodbar:

It looks like it has rotational 180 degree symmetry in all axes. Is the following model_info.json correct?

{
  "symmetries_discrete": [[1,  0,  0,  0,
                           0, -1,  0,  0,
                           0,  0, -1,  0,
                           0,  0, 0,   1]],
  "symmetries_discrete": [[1,  0,  0,  0,
                           0, -1,  0,  0,
                           0,  0, -1,  0,
                           0,  0, 0,   1]],
  "symmetries_discrete": [[1,  0,  0,  0,
                           0, -1,  0,  0,
                           0,  0, -1,  0,
                           0,  0, 0,   1]],
  "align_axes": [{"object": [1, 0, 0], "camera": [1, 0, 0]}, {"object": [0, 1, 0], "camera": [0, 0, 1]}, {"object": [0, 0, 1], "camera": [0, 1, 0]}]
}

Also a question about mirror symmetry.
doorhandle:

It looks like it has some mirror symmetry around one axis. Does it need any kind of model_info.json file ?

Thanks.

[mintar]

Is the following model_info.json correct?

No, it should look something like this:

{
  "symmetries_discrete": [[ 1,  0,  0,  0,
                            0, -1,  0,  0,
                            0,  0, -1,  0,
                            0,  0,  0,  1],
                          [-1,  0,  0,  0,
                            0,  1,  0,  0,
                            0,  0, -1,  0,
                            0,  0,  0,  1],
                          [-1,  0,  0,  0,
                            0, -1,  0,  0,
                            0,  0,  1,  0,
                            0,  0,  0,  1]],
  "align_axes": [{"object": [0, 1, 0], "camera": [0, 0, 1]}]
}

It looks like it has some mirror symmetry around one axis. Does it need any kind of model_info.json file ?

No, mirror symmetries are fine. Only rotational symmetries need any special handling.

[ArghyaChatterjee]

Hi, thanks for the clarification. Closing the issue.

[ArghyaChatterjee]

Sorry to revive the issue, I am dealing with a mug model. If I think about geometric symmetry about the mug, the json file accounting for the symmetry looks like this:

{
  "symmetries_discrete": [
    [1,  0,  0,  0,
     0, -1,  0,  0,
     0,  0, -1,  0,
     0,  0,  0,  1]
  ],
  "align_axes": [{"object": [0, 1, 0], "camera": [0, 0, 1]}]
}

Am I correct ??

So, geometrically this mug model has a symmetry along y axis, but texture wise, it has different texture in one face and different on the other. In this situation, should I include a model.json file like the above or skip it ??