Any 2D layer can have 3D capabilities added to it in order to merge it with 3D elements. The word added is very important here because a 2D layer in Autograph is not "converted" to 3D. It just has additional properties added to it which are based on 2D parameters, including 2D transformations, which are always present.
The transformations displayed when 3D mode is activated are visually close to 2D mode, except that Skew is no longer available and the parameters now have 3 dimensions.
There is also a parameter to define rotation order, from 6 possible choices.
For more information on how to manage 3D elements in Autograph, please refer to the dedicated section.