I was doing the first step tutorial ( M10 ) and Ari is showing an example of using $LIFE and $AGE to scale an object with each successive keyframe.

I decided to play around with some of the nodes, and in this case the Source node that lies within the PoPnet( old version ).

In the example he uses a value of 3 for the x axis in velocity under the attributes tab of the source node.

This works fine as expected, so you see the sphere ( that was created to show the example ) increase in size as it advances along the x-axis with each successive keyframe.

So I tried adding to the Y value velocity the expression: sin($F)

With this expression I get something that is not expected.

The attached photo is a superimposed screenshot layered upon another screen shot to show the differences of results from different keyframe advances; in this case one as it looked at keyframe 45, the other 90.

What is happening that each previous ‘instance’ of the sphere gets re-created and re-plotted?

Is there something in the expression that can be changed so that only each new ‘instance’ is calculated while previous plots left alone?.

Thanks.