Paul Bourke wrote:
> Someone (thanks Warp) pointed out in a posting a few days 
> that the df3 file format in PovPray had been expanded to
> handle other than 1 byte voxels, I have no idea how I missed
> that improvement!
> 
> I have a project which I had decided not to use PovRay for
> because I figured there wasn't going to be enough voxel 
> dynamic range, that has all changed. So I converted the
> data and it turns out that the data cube is periodic so
> it can be tiled in 3D space. Unfortunately when I tiled
> my volume (cube containing df3 media) it got the following.
>    http://astronomy.swin.edu.au/~pbourke/tmp/tiled.jpg

I am not completely sure but it is probably related to the use of 
multiple boxes.  Why don't you use one media container with a repetitive 
media pattern?  You can use the repeat warp or functions for that.

Christoph

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