Concerning the animation problem, I see things as follows:

Solution 1:
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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:
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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:
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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?



Bruno

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