Hi,

I'm tunning dop parameters and set the current frame to 2. The problem is I must reset the simulation every time when parameters changed.

Anyway to refresh the simulation automatically?

Thanks!

Normally the simulation resets automatically whenever the first frame of the simulation is evaluated. A parameter change that resets the simulation on the next play should turn the buffer meter orange in the playbar. Sometimes changes to inputs of the simulation don't always trigger a reset. In those cases a manual reset is needed.

you can Shift+Click on the brain icon, it will recalculate outdated dop caches up until the current frame
or Ctrl+Click to force it to recalculate even if Houdini didn't invalidate the cache

You can also set a hotkey to reset active sim: Open the hotkey editor and search for "reset" and map this to a key.