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"mave" <kum### [at] students ntuacuk> wrote in message
news:web.46938683d8092208b95cc49a0@news.povray.org...
> hiii,
> m developing an animation of a drug carrier. initially i hv sucessfully
> created one model having a sphere which is completly encapsulated with a
> four tail molecules. i hv succesfully created one animation in which this
> sphere having molecules around revolving on x axis.
>
> now i want to show evry molecule ( four tail) coming and attaching to the
> sphere. how to do that... m stuck...
>
Hi Kumar,
You could define a 'swim' path for each molecule using a spline, then,
through the animation use the clock or the frame number to position and
orient the molecule along that spline. See Spline_Trans in the help which
aligns an object to a spline for a given time value
You should declare your molecule obect so that the point that will attach to
the sphere is at the origin with a know orientation (e.g. sticking straight
up). Add a copy of the molecule to the scene and orient it using
Spline_Trans.
The end of each spline should reach the sphere, touching it at right angles
to the surface at that point. You could use a factor with the clock variable
so that the molecules don't all hit the surface at the same time. You could
also use an #if construct to change the behaviour after the molecule reaches
the sphere so that, for example, it spins along with the sphere.
If you want molecule 1 to hit the surface 80% of the way through the
animation then incorporate an #if condition that says, when clock<=0.8 use
Spline_Trans to align it, passing Spline_Trans a parameter of clock/0.8.
Then if clock>0.8 simply attach it to the sphere before you rotate and
position the sphere.
Regards
Chris B.
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