A backward solve has to do with the control rig driving a character's animation. When a control is manipulated, it looks at how the movement will affect the controls down the chain (a forward solve) and well as how its movement affects controls higher in the chain (backward solve), basically double-checking the work. Some animations and features rely on the forward or backward solve in order to add effects or motion to the character at runtime.
back-solve
When a control is manipulated, it looks at how the movement will affect the controls down the chain (a forward solve) and well as how its movement affects controls higher in the chain (backward solve), basically double-checking the work.
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