What interests me more is to find the volume by dumping 200 m^3 of rocks for example in a hopper, and find if this dimensions i have for the hopper will be enough or i may need bigger or smaller hopper, more than the animated part.
What is the aggregate size of your dumped product? I guess it doesn't matter. If you already know you need to contain 200 cubic meters, you should be able to model an appropriate container. I would use the Cavity feature to simulate the area of your 200 cubic meter load, then adjust the size of the hopper accordingly.
"Art without engineering is dreaming; Engineering without art is calculating."
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