thanks evert it seems what i need .but i can not access its defenition, when i open downloaded file in grass i face 298 message whoud you tell me what should i do?
regargs
elham
Without seening a screen capture of the error msg i can only guess that the reason the the definition is not working is because you are running an earlier version of GH than this was created in. I have downloaded both solar def's in the last few days for a project and they seem to run fine on GH 06.0059 which if your not running can be downloaded from Here...
just use circle, eval, vector, points and you will have something like sun sky, look on tutorial in Alghoritmic Modeling in Mohamad Kahabazi pdf on page 106, for download in tutorials :)