Peter Popov wrote:
> 
> Can anyone please explain why this:
> 
> density { checker }
> 
> and this
> 
> density { checker rgb <1,0,0>, rgb <0,0,0> }
> 
> give errors, while this:
> 
> density { checker density { rgb <1,0,0> }, density { rgb <0,0,0> } }
> 
> works just fine?
> 
> Here's the whole scene:

That is the correct behaviour as detailed in the docs. It is the exact
same syntax necessary to use color list patterns in a texture statement.
There is one very short 2 line mention of this in the docs that is a bit
hard to find. The second example you provided is the correct way of
specifying color list patterns in media.


P.S. About a month ago I posted a study of this in povray.binaries.images.
It provides example images and the source code showing how to use the three
different color list patterns in a media statement.





-- 
Ken Tyler

mailto://tylereng@pacbell.net

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