Rob Verweij <rg.### [at] worldonlinenl> wrote:
> How can I accomplish the following?
>
> I have a 240 frames animation. In it I have several lights. I'm using
> one of those lights to simulate the bright flash of an explosion which
> starts at frame 100 and dies out a couple of frames later. I've studied
> the clock features (including the My_Clock one) but still haven't found
> a solution. Can anyone help me out?

The Automatic Clock Modifier macros allow you to keyframe values like this
very simply:

#include "autoclck.mcr"
#declare ExplosionBrightness = (From (99/240, 0) To (100/240, 1) To_Using
(110/240, 0, "Decel"));

#if (ExplosionBrightness > 0)
   light_source {rgb ExplosionBrightness*<3, 2.5, 2> location ... }
#end

The macro file package can be downloaded from:

   http://www.geocities.com/ccolefax/clockmod.html

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