Question: Parametric plot in 3D

Put x=f1(t1,t2,t3), y=f2(t1,t2,t3), z=f3(t1,t2,t3).  

The question is that: How to plot all points of form [x,y,z] with t1 in [a1,b1], t2 in [a2,b2], t3 in [a3,b3].

Thank you.

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