In article <3EAC58E7.7AE6A1B5@gmx.de>,
 Christoph Hormann <chr### [at] gmxde> wrote:

> Well, you need a function to select whether the low or the high resolution
> map is used at a certain position.  To avoid problems with the root finder
> you will need to  create a smooth transit between the regions.

One idea I've had for this is some kind of prioritized object list. 
Basically, it would be an ordered list of objects which POV would go 
through until it found an intersection or ran out of objects. In this 
case, higher resolution landscape models would be higher priority, while 
larger area, lower detail models would have lower priority. Close to the 
camera, the high res one would be hit, and the others ignored. Further 
from the camera, the high res one would be missed, but a lower res 
version would be there.
There might be some unexpected shadows at the transition point, but they 
should be minimal.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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