thx for you replies.
@r_gigante: I have few splines with tons of points. I want them to grow in an animation. Using sweep objects results in a very slow performance, so I thought about other ways. S&T isn´t an option, because it is hardly to controll well. Drawing in the rendering somehow is the last idea if have, but before I start to test it, I need to know if it´s possible at all. If not, I´ll be happy about a lot of relaxing time :)
@mp5gosu: Yes, I really would like to do it with GeClipMaps, but I don´t know how to get it in the rendering/bitmap created by rendering/rendering viewport.
Last: I knew writing the tags into the title isn´t correct, but I didn´t see where they are to add.
[EDIT] I have found the left bottom corner for adding tags :), sorry