"Chris B" <nom### [at] nomailcom> wrote:
> There are certain things that will produce an all-black image, such as not
> having anything in the scene (which can render very quickly).

Ironically, this sentence gives me the advice I needed.  The problem is that the
set of images which I wished to ignore were also the ones that rendered
extremely slowly. And my #if() predicts the render speed.  I could simply put a
black object in front of the camera when #if() is meet, and meet at least half
of my objectives.

thanks.

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