Jump to content
Sign in to follow this  

Chops/Motion Effects confusion

Recommended Posts


I am rather new to chops in Houdini and I am absolutely baffled by them.  I was hoping some of you kind souls could lend a hand.


1. What is the difference in usage of the "fetch" and "channel" nodes? They both seem to pull parameter data from other parts of the scene. When would you use one over the other?

2. How does one just take single channel from a chopnet and drive a parameter? I have used the motion effects menu and you get this strange "Overridden by /obj/geo1/motionfx/disable_export1 twist2:strength" which seems very non-Houdini like. It feels like it is hiding something.

3. How does one use the chop expression? There is not much documentation on this, like what are the arguments you need to feed it, and what does it return. Furthermore, in the docs, it has been replaced by hou.chopnode but I cannot find use for that in the context of the larger system either. Possibly the export chop?

I am sure there are reasons for all these things, and I am still rather new to Houdini so any help would be greatly appreciated



Share this post

Link to post
Share on other sites

Just first Question:

For example, I made a HDA that use fetch but not channel, because I do not know which sop will be fetch, and I can set which channels will be selected in advance.

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this