In article <387f44f4@news.povray.org>, "Tom Melly" 
<tom### [at] tomandluforce9couk> wrote:

> hmm, I was more thinking of, for example, being able to place random rocks
> on the surface of a heightfield by detecting when you'd hit the y value of
> the hf at a particular x and z location.

For that, you need a patched version of POV that has the trace() 
function. This function lets you trace rays within the scene file, so 
you can just trace a ray straight down from the rocks xz location to get 
the right y distance. MegaPOV has this function.
http://nathan.kopp.com/patched.htm
The only other way I know of would be to use an external program to get 
the color values and calculate the correct height at each point by hand.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

Post a reply to this message