The Aim and the Up axes cannot be the same. If the object is trying to aim at an object directly above it, then one of the object's other local axes will arbitrarily be chosen as the Up direction. Weight Weights are useful if you have constrained an object to more than one other object. This way you can weight the different constraints, so that a constrained object will tend to meet one constraint more than another. You can change the weight value either by clicking in the field, typing a value and pressing Enter, or dragging the slider bar.
Weights are animatable.
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