Quote - You use it to make a morph target independent of the figure, e.g. so you can copy it to another figure, or load a morph target that you created in an external modeling app.  I'm pretty noob at that though.

It was also intended to keep pz3 and cr2 file sizes down, mostly as a way to help people save hard drive space.

Although, with the lowering cost of large hard drives, there isn't as much of a need for it, the implementation seemed too problematic and out-dated to me.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.