On Tue, 25 May 1999 00:19:35 +0300, Lewis wrote:
>> using clock and clock_delta (actually, only if the clock is zero on
>
>what's clock_delta?

From the section "Built-in Float Identifiers" in the 3.1 manual:

  The built-in float identifier clock_delta returns the amount 
  of time between clock values in animations in POV-Ray. While 
  most animations only need the clock value itself, some animation 
  calculations are easier if you know how long since the last 
  frame. Caution must be used when designing such scenes. If 
  you render a scene with too few frames, the results may be 
  different than if you render with more frames in a given time 
  period. On non-animated scenes, clock_delta defaults to 1.0. 
  See section "Animation Options" for more details.

This is new in 3.1, as I recall.

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