Why you ignore global rotation in SMPL?

[gsygsy96]

hello @akanazawa , When I scaned your code which is 'batch_smpl.py', I found you ignore global rotation in which adding pose blend shapes. Have you changed this part from official smpl version?

code: ` # 3. Add pose blend shapes

N x 24 x 3 x 3

        Rs = tf.reshape(
            batch_rodrigues(tf.reshape(theta, [-1, 3])), [-1, 24, 3, 3])
        with tf.name_scope("lrotmin"):
            # Ignore global rotation.
            pose_feature = tf.reshape(Rs[:, 1:, :, :] - tf.eye(3),
                                      [-1, 207])

`

[akanazawa]

Hi,

This is what the original SMPL does. See line 37 of posemapper.py in SMPL. This is the feature that is used to compute pose blend shapes, and pose blend shapes should be invariant to your global rotation.

FYI My TF smpl code is tested against the original SMPL to make sure that they are exactly the same :)

Best,

Angjoo