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A crate for creating and evaluating executable directed graphs at runtime. In other words, gantz allows users to compose programs described by interconnected nodes on the fly.

Gantz is inspired by a desire for a more flexible, high-performance, open-source alternative to graphical programming environments such as Max/MSP, Touch Designer, Houdini and others. Named after gantz graf.

NOTE: gantz is currently a research project and is not ready for any kind of real-world use.

Design Overview

Gantz allows for constructing executable directed graphs by composing together Nodes.

Nodes are a way to allow users to abstract and encapsulate logic into smaller, re-usable components, similar to a function in a coded programming language.

Every Node is made up of the following:

  • Any number of inputs, where each input is of some rust type or generic type.
  • Any number of outputs, where each output is of some rust type or generic type.
  • An expression or function that takes the inputs as arguments and returns the outputs in a tuple.

Graphs describe the composition of one or more nodes. A graph may contain one or more nested graphs represented as nodes, forming the main method of abstraction within gantz.

A Project provides an API for easily creating graphs, compiling them into Rust dynamic libraries and loading them ready for evaluation, all at runtime. The project manages a single cargo workspace that contains a single crate for each graph.

See the gantz/tests directory for some very basic, early proof-of-concept tests.

Included Crates


Contains the core traits and items necessary for any gantz implementation. The current approach heavily revolves around rust-code generation, however this crate may get generalised in the future to allow for more easily targeting other languages.


Provides implementations for the core traits and a high-level Project API for convenient use.

This repo does not provide any GUI itself - this will likely be implemented in a separate repository using nannou.


  • A simple function for creating nodes from rust expressions.
  • Allow for handling generics and trait objects within custom nodes.
  • Serialize and Deserialize for nodes and graphs via serde and typetag.
  • Project workspace creation.
  • Push evaluation through the graph.
  • Pull evaluation through the graph.
  • Simultaneous push and pull evaluation from multiple nodes.
  • Stateless node codegen.
  • Stateful node codegen.
  • Implement Node for Graph.
  • Conditional evaluation #21.
  • Evaluation boundaries #22.
  • Dynamic node I/O configurations #31.
  • A convenient API for managing node state #44.
  • A way to easily generate node types from existing fns in other crates.

After each of these goals are met, a new repository will be created where gantz will be extended using nannou to provide higher-level tools including:

  • A GUI for creating, editing and saving graphs and custom nodes at runtime.
  • Node packaging and sharing tools, likely built on cargo and
  • A suite of nodes providing an interface to nannou's cross-platform support for a wide range of protocols and I/O:
    • Windowing and input events.
    • Phasers and signals.
    • Audio input, output, processing and device management.
    • 2D/3D geometry, graphics and shaders.
    • Video input and processing.
    • Networking (UDP and TCP).
    • OSC.
    • Lighting, lasers & control: DMX (via sACN), CITP (& CAEX), Ether-Dream.
    • GPU general compute.
    • General file reading and writing.


Licensed under either of

at your option.


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.


A library for creating and evaluating executable directed graphs at runtime.




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