I want to actually use an animation as a height field, but the idea is
basically th same:

clock goes from 0 to 1
animation goes from fram 1 to 15
mapped_animation goes from frame 1 to 15


#declare current_frame=15*clock     //should be an integer...
#declare file="D:\images\fram" + current_frame + ".tga"
height field { file    <<height field stuff>> }

but, because current_frame is an integer, it can not be concatenated (added)
with the strings "D:\images\fram"  and  ".tga,"  so, I can not end up with
the string "d:\images\povray\fram15.tga"

The question is.....  (drum roll please)   how do I convert the integer
current_frame to a string so that I can concatenate it?  I have tried the
system, but using current_frame="15"  to see that strings do concatenate the
way I want, and it worked fine.  But, in order to automate it as an
animation, I need 15*clock, and that returns a number, not a string!!!
can anybody help me with this?   Is this stated explicitly in the manual?

Thank you for any help you can give me!!

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