On 3/30/2013 11:55 AM, nimda wrote:
> Hello people,
>
> I had trouble with the rendering time of frames. If a scene needs, let's say,
> ten minutes to render then an animation of 6000 frames would take approximately
> 41 days, which is a bit too much for only 4 minutes of movie (at 25 fps). But in
> general the objects needing a lot of rendering time do not move, and on the
> other hand the animated objects do not need a lot of time consuming details as
> the eye of the viewer has not enough time to inspect the object thoroughly.
> So I came upon the following idea: Instead of parsing and rendering the same
> objects over and over again, let's just do it once, capture the scene in an
> image file and use it as an image map on a z-plane. A bit like the scene in a
> theater. This basically works fine but the animated objects
> 1)  don't cast shadows,
> 2)  do not disappear behind the immobile objects.
>
> I have a workaround for both of these problems in some cases, but is is not
> always possible.
>
> For the first problem I thought of an horizontal plane with the "no-image"
> object modifier but it doesn't capture shadows, the same thing happens when I
> use the "Clear" color pigment. A good solution is to only recreate the "ground"
> for each frame. In general grounds do not need a lot of detail, and
> sophisticated objects like buildings, musical instruments etc. are standing
> upright.
>
> For the second problem I see as a solution to only rebuild the complex objects
> (or only parts of them) for those frames in which the disappearance occurs.
>
> I wonder if anybody has a better idea about this?

See if you can replace the complex objects and their shadows with 
sprites.  Getting the projection math right is going to be non-trivial.

Regards,
John

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