"hobBIT" <bla### [at] gmxde> schreef in bericht 
news:4a4f81bd$1@news.povray.org...
> At the moment, growing is weighted by 4 factors:
> 1. follow direction of last segment
> 2. random
> 3. gravity
> 4. "up",
> while the last can be seen as growing towards light. It's easy to add 
> another weight which grows to a given vector, but growing to "light" can 
> be very complex, depending on scene complexity, maybe a path can help out 
> to accomplish this.
>
> The starting point and primary growing direction are input parameters.
>
> I think about a total replace of the current growing algo, as it always 
> clamps to any object, so hanging ivy is not really possible atm.
>

"up" is probably enough for most  outdoor cases as "light" can be 
interpreted as the sun but also as the bright sky. Growing indoors however, 
would need a vector, representing a window for instance, or several vectors 
for several vectors, where a "brightness" parameter would additionally bias 
the growth more or less.

Hanging ivy should be implemented indeed as this happens in real life as 
soon as the branches overtop their support.

Thomas

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