Duplicating movie clip to take some shape

Hi All,

I would appreciate if someone can please help with the query below:

I have a circle movie clip which i want to duplicate so that it takes the shape of the object.

for instance, if i want the dots to form a shape of cone by randomly populating the region of the cone/square etc.

i can do this via masking, but i dont want the dots to cut or maybe eliminate dots that are going outside the boundry of the shape.

please advice.

thanks in advice.