Dataflow code

[kaveh808]

One very popular and common feature of 3D systems these days is a data flow model. Houdini is probably the best example.

In Lisp, this is usually represented by having a computed-slot feature in classes.

If this is something we want to have, should we roll our own or use an existing package?

I have implemented a very preliminary and not terribly elegant version of this in the file procedural.lisp as a proof of concept.

I'm thinking of Kenny Tilton's Cells package as one possibility. There are also others. Does anyone have any experience with any of these, or any thoughts?

As is my usual way, I prefer the simplest smallest package that will do the job.

[kaveh808]

Some options:

https://github.com/kennytilton/cells

https://gitlab.common-lisp.net/computed-class/computed-class

[loskool]

Is the idea simply to ensure that changes to some kind of "parameter object" propagate to the objects that depend on those parameters? Or is parallelization a concern too? I'd like to contribute by reviewing some of these "reactive" or "dataflow" systems, but knowing basically nothing about conventions in 3d design systems, I could use a little input about what kinds of features I should be evaluating.

I'm also reminded of Radul and Sussman's 2009 work on the "propagator network" model of computation. This model gives you, in addition to freedom from temporal considerations, natural parallelization as well as "data provenance". Is provenance something that people care about in this space? I can imagine it could be but really don't have the literacy here to make a judgement.

[kaveh808]

Basically data flowing along a dependency graph. The most advanced system is Houdini. Maybe find a video demonstrating their node graphs. The entire system is built on that.

[awolven]

I have Adhoc, Another Declarative Hierarchical Object-Centric CLOS Customization. It's a lazy-evaluated CLOS with computed-slots and generative subobjects. ***@***.***:awolven/adhoc.git

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On Sat, Aug 20, 2022 at 5:28 PM Kaveh Kardan ***@***.***> wrote: One very popular and common feature of 3D systems these days is a data flow model. Houdini is probably the best example. In Lisp, this is usually represented by having a computed-slot feature in classes. If this is something we want to have, should we roll our own or use an existing package? I have implemented a very preliminary and not terribly elegant version of this in the file procedural.lisp as a proof of concept. I'm thinking of Kenny Tilton's Cells package as one possibility. There are also others. Does anyone have any experience with any of these, or any thoughts? As is my usual way, I prefer the simplest smallest package that will do the job. — Reply to this email directly, view it on GitHub <#26>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABGMMO6ZIYOREI5CPTOAEDV2FLYRANCNFSM57D4PJPA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>