vizact.onkeydown(' ',lines.clearVertices) cannot be used in vizard 3.0?
 

vizact.onkeydown(' ',lines.clearVertices) cannot be used in vizard 3.0?

No, .clearVertices() was added in Vizard 4.

Is there any way to achieve this goal in vizard 3.0?

You could try removing the on-the-fly object and starting a new one.

It seems like the on-the-fly object is always a global one. I cannot create local on-the-fly-object. Actually, the function I wanna realized is to delete the graph and then continue creating. When I tried to use remove, the graph seems no longer visible.

Btw, if I upgrade vizard from 3.0 to 4.0 or 5.0. Is any compatibility problem going to happen? Can I still run phantom omni in it?

There are updates between major Vizard versions (i.e. Vizard 3 to 4, and Vizard 4 to 5), that could potentially break scripts. We have upgrade guides in both the Vizard 4 and 5 Help that document these changes. The following is a link to the Vizard 5 upgrade guide from our online documentation:

http://docs.worldviz.com/vizard/#Upgrade_guide.htm