I'm not sure that I understand what you want to get, but my first idea 
is that if you want to see just a thousand pixels you can do a 31x31 
render or something like this.
Apart from that, I don't think you can select pixels to be rendered from 
a pool of 512x384 pixels, you would e able to do that by specifying 
spans that you want to render in the image, but that would mean to redo 
the parsing of the scene each time.

JC

simon shannon wrote:
> Dear All,
> 
>     I have a height field with an image draped over it (image_map).
> Instead of generating an image of the whole scene, I would just like
> to know the value of, say 1000 specified pixels taken from a 512x384
> view and write them out to a file. Is that possible?
> 
>       -Simon Shannon
>

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