Hi,
I've been unsuccessfully trying timeshift and solver nodes to store the previous value of a detail attribute. Not the value on the previous frame, but the previous different value. From what I've read, I am quite sure Solver node is the way to go, but I cannot come up with a solution inside the solver. Any ideas?
Thanks!

What causes the change in the value?

Here's a file with my setup. I have a camera animation and 10 fixed cameras. A detail attribute stores the best (closest angle) fixed camera compared to the camera animation. Then I have a trigger value (detail float) that switches to 1 every time “camera1” detail attribute changes its value. My ultimate goal is to make that 1.0 trigger value, fade to zero in (let's say) 5 frames, instead of going back to zero the next frame. So i can use it as a blending value, every time there is value change in the “camera1” detail attribute value.

When your logic allows the change in value, update ‘previous value’ attribute with the current value immediately before updating the value.

pseudocode:

Thanks for your reply, jsmack. But I am afraid that “cam” only gets evaluated in the “cam = new_cam” so I always get a 0 value for “prev_cam”

perpen
My ultimate goal is to make that 1.0 trigger value, fade to zero in (let's say) 5 frames, instead of going back to zero the next frame.

Here's a new scene with a solver that generates this. Does that help?

This is exactly what I was trying to achieve last night until midnight Thanks a lot for your help!

Great, glad I could help!