In a thread I brought up elsewhere,  Christoph suggested:

<< For two spheres you just do:

#declare Start_Idx1=mechsim:face_count;
MechSim_Generate_Sphere(...)
#declare Start_Idx2=mechsim:face_count;
MechSim_Generate_Sphere(...)


and later:

MechSim_Show_Sphere(Start_Idx1, Start_Idx2-Start_Idx1, ...)
MechSim_Show_Sphere(Start_Idx2, mechsim:face_count-Start_Idx2, ...)
>>

However, the _Generate_Sphere _ code would only be used in frame 1, and you 
need to show the objects on frames 2 through the end.

I know I'm truly ignorant here, but I'm tempted to ask if it is a limitation 
of the mechsim system that it cannot work with more than one sphere and make 
them both shiny.  Or you have to do some arithmetic on paper to figure out 
the numbers that the Idx variables would represent.

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