Warp <war### [at] tagpovrayorg> wrote:

>   But why would you want to do that? It doesn't correspond to any effect
> which happens in photography. IOW, the result will be physically incorrect
> and doesn't correspond to anything that happens in real life in photography.
> It will only be an artificial special effect.

Exactly right-- In a photograph you can never tell the direction that an
object is moving by its blur.
This is a special effect, and a cartoony one at that.

Christoph Hormann has given us an excellent example of how motion blur
"should" be used
( http://megapov.inetart.net/demo/mblur.png ), but there's a lot to be said
for cartoons and illustrations as well.  The question was about how to make
it look that way, not *whether* it should look that way.  =)

-Windell.

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