Skin hand posers setup

You will need to set up both the left and right hand posers of your skin.

Assigning Finger Roots

Assign every finger root bone from the skeleton like in the image below:

Configuring "Digit Forward Direction"

Different hand skeletons use different forward directions which means the poser needs to be configured accordingly.

To find out which forward direction your hand skeleton uses, select one of the bones and look at the arrows (make sure you are in local mode). In the image below we see the Y-axis (green arrow) is the forward direction: as such we set the "Digit Forward Direction" to y = 1.

Your hand posers are now properly set up.