Hello,

I have an effect to achieve that includes several steps.

1- render flip sim particles
2- render volume create from the pre rendered flip sim.
3- render pop sim particles using the pe rendered volume.
4- render images from flip particles
5- render images from pop particles

there is different frame range for each of theses renders.

What is the best ropnet setup to renders all of theses operations above in that specific order and tell the ropnet to finish one task/node before to start a new one ?

For now I have 3 geometry ROP and 2 images ROP in a ropnet.
I take the “geometry1” (flip) and link as input the “geometry2”(volume) and so on …
Then I tell the render control of the “geometry1” to use the “node by node” option and set speciifc frame range ( strict) for each node.

is it good ?

If you want to generate the geometry first, then render images, your network is backwards.

ROPs flow top to bottom in execution.

You can use the render command to see how your ROP network will evaluate.

In a Houdini textport, with your last ROP in the chain labeled something like “RENDER”, you can type:
/ -> render -p RENDER
This will return to the Houdini shell the execution order of your ROPs.

See the help for the render command as there is the -c and -C options as well.

If you want to batch certain ROPs, have them execute their entire frame range before executing the next ROP, you can insert a Batch ROP below the ROP(s) you want to execute first before executing subsequent ROPs.

If you want to batch each of your ROPs, have them execute their frame range before going to the next ROP, then you can insert Batch ROPs between them:

geometry1
|
batch1
|
geometry2
|
batch2
|
mantra1
|
batch3
|
mantra2
|
batch4
|
mantra3
|
RENDER >>> This is a Null ROP labeled RENDER for the render command

thanks for your reply Jeff

I will study that.