why check the sign of quternion?

[lianghongzhuo]

Hi,
I saw in your commit: 8b82f2d
You checked the sign of the quaternion before sending it to the conversion function from scipy to convert to a rotation matrix.
Since you only return a rotation matrix, not the quaternion, is this check and conversion necessary?
Or did I miss something?
Thank you!

[danielsanjosepro]

Hey @lianghongzhuo,
Sorry for this late response. For some reason I did not get notified for this one.
You are absolutely right. I was debugging orientations and this one slipped over :)
I will rollback these changes.

[danielsanjosepro]

#69 should solve this :)