I try to use a cubic scene type in TW4. What kind of pictures need TW4 ? six different pictures corresponding to the six cubic faces ? Or just one picture which contain all the faces in a particular position ? I have not found any explication in the documentation of TW4.
TW3 uses one picture that contains all faces in a 6 to 1 ratio. ie 6000X1000 jpg. I believe that TW4 is the same since I have not heard of any changes concerning it.