Bruno Cabasson wrote:
> Concerning the animation problem, I see things as follows:
> 
> Solution 1:
> -----------
> The nth frame I(n) of an animation is a function of time only. Its
> description depends on the sole time parameter. Then you can conceptually
> write:
> 
> I(n) = F(tn), with F being the function that describes the scene at time tn.
> 
> This is POV's point of view, through the 'clock' variable and reparsing the
> whole scene (except radiosity and photon maps if so specified).
> 
> This solution requires only the description of the F(t) function.
> 
> Solution 2:
> -----------
> The nth frame I(n) is made by delta wrt first frame. Its description relies
> on the description of first frame at t0 and a delta function that depends
> on the time parameter. Then you can conceptually write:
> 
> I(n) = I(0) + D(tn), with D being the function that describes the variation
> of the scene between tn and t0.
> 
> This solution requires the decription of I(0) and the D(t) function.
> 
> Solution 3:
> -----------
> The nth frame I(n) is made by delta wrt previous frame. Its description
> relies on that of the previous frame I(n-1) and a delta function that
> depends on the two instants tn and tn-1. Then you can conceptually write:
> 
> I(n) = G(I(n-1)) = I(n) + d(tn, tn-1), with d being the function that
> describes the variation of the scene between tn and tn-1.
> 
> This solution requires the description of I(0) and d(t1, t2) function.
> 
> 
> Each of these solution is a different approach with pros and cons and
> implies related features and syntax.
> 
> Concerning POV4, which of these is preferable?
> 
none or all

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