It’s extra of a rigger/animator desire than modeler. The two poses have some tradeoffs to one another. The A pose is about making the characters bend and deform as naturally as potential. It reduces UV stretching across the excessive deformation stress factors as a result of the mannequin’s arms are a lot nearer to their resting place and don’t must rotate as far. A poses have angled arms and infrequently barely bend the elbow as properly, which signifies that the arm bones are slightly tougher to rig.
T poses require extra edge loops across the excessive deformation stress factors like shoulders and hips to be able to hold them from getting too ugly when these bones transfer too far. This is finished to counteract the UV stretching talked about above. The good thing about the T pose is that it’s a lot simpler for the rigger to align the bones as a result of the arms are in a straight line parallel to a significant axis. Everything strains up far more simply and cleanly alongside the main axes while not having to do extra work.
Ultimately, the variations are small and as much as the animation management’s preferences. Some want it a method, others want it the opposite, and lots of instances a venture is simply going with it as a result of that’s the way it was began and there’s been an excessive amount of tech work executed to change to a different and must redo all of it.
PS. These variations additionally apply to the rig’s default leg positions. Straight down? Angled? If angled, how huge an angle? And so on…
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