Group dop objects by velocity?

[Akabane]

Hey gang, I'm studying a little DOPs lately and I've been arguing how to group dopobjs by some value like velocity.

What I actually need is a drag force only applied to the object which are going too fast than a certain value.

I thought I could do that with dopfield expression to go and fetch data, but couldn't find any "velocity" stuff anywhere T___T

Any help?

Thanks!

(DOP is really a completely new way of thinking...is there some comprehensive explaination on how the dataflow and data manipulation in DOPs works somewhere?)

[graham]

Velocity is is stored in the Position/Options subdata under the "vel" field.

To group by velocity you could do something like this:

vlength(
    vector3(
        dopfield("..", $OBJID, "Position", "Options", 0, "velx"), 
        dopfield("..", $OBJID, "Position", "Options", 0, "vely"),
        dopfield("..", $OBJID, "Position", "Options", 0, "velz")
    )
) > somenumber

Edited December 4, 2010 by graham

[Akabane]

Thank you very much graham

[Benyee]

Also

vlength( vector( dopfields("/obj/AutoDopNetwork", "$OBJID", "Position", "Options", 0, "vel") ) )> somevalue