If I wanted a value to change between particular frames, I guessed it would be easy. I have looked at available functions, but don't recognise which ones to use.

e.g:

If the 'frame number' is between 10 and 20, then output value 3; otherwise output value 7.

Well, if frame number is really what you're asking about, the simplest thing would be to rig up two separate PZ3 scenes, one for each material setup.  Render frames 10-20 in one scene, and the other frames in the other scene.  Combine them in VDub to make a movie.

I suspect that's not the real underlying question, though.

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In the past I've used max and min functions to calculate a range so I've extended that idea, not sure the logic is correct but have a look (unfortunately saw your question after the application of Guiness  which doesn't help :S ). There are other math functions so maybe there is a much easier way to do this.

b=max(0,a-9)
c=min(0,b-12)

d=(abs(c)/abs(c)) - Possible flaw, dividing zero by zero will cause a math exception so depends on how Poser handles this, I'm assuming the guys at SM will decide dividing nothing by nothing still gives nothing.

d=1 in range and d=0 otherwise

e=7-(4*d)

Try something like this ...

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Very close, SG. Step evaluates Value_1 <= Value_2. You have 21 and 9 in there - you should have 20 and 10. You overthunk it.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)

Quote - Very close, SG. Step evaluates Value_1 <= Value_2. You have 21 and 9 in there - you should have 20 and 10. You overthunk it.

Interesting. My biggest mistake was to refer to the Poser manual :-)

Quote - Step: Selecting Step returns 1 if Value 1 is less than
Value 2, and 0 if Value 1 is greater than or equal to
Value 2

A quick test demonstrated that you are indeed correct, so the manual needs to be changed!

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Oh - the manual says that? I have never read the manual - this must be why.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)

Thank you all very much. That is most useful. The solution now looks so obvious!

I have spend a while looking at the maths functions, and I am attempting to reconcile them with my limited knowledge of programming. I wish the manual included a collection of examples of these kinds of logical collections.

Quote - Oh - the manual says that? I have never read the manual - this must be why.

 

That line went right into my Signature.  :biggrin:

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I'm still waiting on BB's Book !!! on the mat room

 

if BB and SB did a book on python ! (any chance, mmmm guess yer both busy lol)

I'd kill for it