It would be useful for some modeling to be able to set a gravity vector that works identically against all grounded components. (By default, the vector could point in a downward direction against the Z axis.) A couple use cases:
> Balance: Some model subjects, such as scales or ornaments, are contrained by the effects of gravity. A gravity vector in combination with a function that adds variable mass to components could be useful.
> Liquid Pooling: With a gravity vector, you could also add a pooling function to see how liquids would fill cavities, and where the liquid would spill from continued adding of liquid, or from adjusting the overall position of the model.
2 cents.
