How to define animated object's speed in ICE

[mrkvs]

I have an animated emitter, and would like to adjust particles's emission speed to emitter's moving speed. I just need some input for my node's "Emit from Null" Speed attribute.

I've learned, that it's possible to calculate object's velocity and acceleration in Global Transform properties, but that help page doesn't go further, stating that:

"Note that you do not need to activate these values in order to read objects' velocity and acceleration in an ICE tree. ICE automatically calculates velocity and acceleration as needed."

So how to read them? 🙂

(I'm a newbie, but trying hardly)

[RaffaeleFragapane]

If the graph is simulated you can simply take the global position of the object, then push it through a get data at previous frame, and then subtract the current frame's pos from the previous frame's.

-                                         +---------------+
                                          |subtract       |
                                          |       result o|-------------->
         /-- o Get at previous frame -----|o first        |
Get pos ----------------------------------|o second       |
                                          +---------------+

[Grahame_Fuller]

Just open the property editor for a Get Data node, click Explore, and get object > Kinematics > Global Transform > Velocity (which resolves as object.kine.global.vel).