Documentation / Node reference / code nodes
code/PolyNode
A saved code subnet, reused by name.
Network
Made from a code/Subnet with "create polynode", then offered in the tab menu under its own name, in any builder that runs code: a tex/Builder, a material builder, an SDF material, a geo/PointBuilder. Its inputs and outputs are the code/SubnetInput and code/SubnetOutput nodes inside, and its params are the defaults of those inputs.
Its content is locked to the definition it was made from: unlock it to change it. A builder only offers the polynodes it can run: one holding a node that only runs on the GPU, like code/TextureLaplacian, is not offered in a builder that cooks on the CPU. code/Globals cannot go inside, since what it gives differs from one builder to another: wire those values into the polynode's inputs instead.
See also
This page is generated from the engine, so it describes the release you can download. The same text is in the editor's Help panel next to the node itself.