i did 3 objects 1 body and 2 eyes, and i set the MDDs,
and set 3 MDD nodes on the “out”
if i “render” each node independently the MDDs work.
but if i connect 1 to another, in that way i don't have to manually export each.
it doesn't work .

i am setting something wrong or is not suppose to connect the mdd nodes like that?

assuming that in the Out you connect so it calculate something and then other thing, like first the point irradiance and then the render right?

since the mdd is not created for each frame but requires to cook continously through given frame range before it can close the mdd file
you need to set rendering order to Node by Node
this can be found on each ROP in Render Control if it has something plugged as an input

because default (Frame by Frame) would render each frame for all nodes before advancing to the next frame and i think that mdd does not like that

to render them all you just connect all to Merge ROP, set its order to Node by Node and render

i was use to the MDD when was a file per frame.
thanks tamte, i will set a merge node tonight