Maya Node Editor and "Cycles" problem

Hi,

i come back with a new problem i’m facing though i have the feeling the answer must no be very difficult.

I want to perform some operation on a nucleus attribute, more precisely, drive the gravity direction vector by some dummy euler angle rotation. I’ve constructed the network of nodes, and attached the inputs and outputs. Problem is i’m getting a wrong result and since i’m convinced the operation is right i’m suspecting that the problem might come from the fact that i’m reattaching the result to the nucleus attribute’s input thus generating a “cycle”.

I tried to use a group’s transform to store the result and pass it on but didn’t work, the cycle still exists.

What i want to do basically is: get the current value of nucleus’attribute, do some calculation and set the new value back to the same nucleus’attribute.

Truth is i did it on friday on my linux workstation and i managed to get it working correctly but now trying to mimic it this weekend on windows this time it doesnt work.

If i eliminate the connection from the group’s transform to the nucleus attribute i can see the correct result in the group’s transform!!!

Another trick that i’ve made up is, since i only need the current value, instead of taking it from the nucleus, to configure a dummy transform with same value and use it as input… This would work but is a workaround.

Is it possible to do what i wanted in the first place?