"RC" <nomail@nomail> wrote in message 
news:web.49a4526f21b0f15ae1acfc5e0@news.povray.org...
> "Chris B" <nom### [at] nomailcom> wrote:
>>
>> Maybe it would help if you could list the values you'd like to generate 
>> for
>> the x-displacement for say the first 12 frames.
>
> 1-1fps
> 2-1fps
> 3-1fps
> 4-2fps
> 5-2fps
> 6-2fps
> 7-3fps
> 8-3fps
> 9-3fps
> 10-4fps
> 11-4fps
> 12-4fps etc.
>

I'm still not quite sure I'm getting it, but I'll take another stab at it.

What you've listed is simply 'div(frame_number,3)+1', so if that's what you 
need then it's easy, but I can't see how that fits with your descriptions 
and I can't see what fps means in this context. In my experience fps 
normally means frames per second, but I don't see how that would be relevant 
here.

Is this the speed? ie the distance travelled per frame? If so you'd get a 
displacement from the initial position of:

Frame 0 - 0 units in 'x'
Frame 1 - 1 unit in 'x'
Frame 2 - 2 units in 'x'
Frame 3 - 4 units in 'x'
Frame 4 - 6 units in 'x'
Frame 5 - 8 units in 'x'
Frame 6 - 11 units in 'x'
Frame 7 - 14 units in 'x'
Frame 8 - 17 units in 'x'
Frame 9 - 21 units in 'x'
Frame 10 - 25 units in 'x'
Frame 11 - 29 units in 'x'
etc?

If that's what you need then the following code should give you this:


#declare ObjectXDisplacement = 0;
#declare Speed = 1;
#local I = 1;
#while (I<=frame_number)
  #if (mod(I,3)=0) #declare Speed = Speed+1; #end
  #declare ObjectXDisplacement = ObjectXDisplacement+Speed;
  #local I = I+1;
#end
#debug concat("Frame Number: ",str(frame_number,3,0),"  ObjectXDisplacement: 
",str(ObjectXDisplacement,3,0),"\n")


Here's hoping that's what you want :-)

Regards,
Chris B.

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