The Normal vector socket in the Normal node wasn't drawn properly and couldn't be controlled. Additionally, the socket name was drawn over it. This happened because the socket had a default value of a zero vector. To fix this, we set the default value to the unit vector `(0, 0, 1)`. Moreover, we don't draw the UI name if the subtype is `PROP_DIRECTION`. Reviewers: brecht Differential Revision: https://developer.blender.org/D5503