SPG USD/Lua Authoring

When to Use

Use this skill when the user asks to author, review, or fix RTX Sensor Processing Graphs (SPG) in USD, CUDA, or Lua: info:spg:sourceAsset, info:id = "spg:...", subIdentifier, opaque AOV ports, RenderProduct / RenderVar / orderedVars wiring, typed value inputs, shader chaining, or cuda.kernel launch scripts.

Inputs

Resolve inputs in this order: existing repository files and referenced snippets, explicit user request, then broader agent context.

• Target artifact: CUDA kernel, .cu.lua launch script, reusable shader .usda, scene wiring .usda, or built-in factory node.
• AOV/resource inputs and outputs, including shape, dtype, and whether each resource is an image or buffer.
• Value inputs and their USD types (int, float, bool, vectors, matrices, quaternions, token) plus defaults or scene overrides.
• RenderProduct path, camera, resolution, RenderVars, final output AOVs, and any shader-to-shader dependencies.
• Public docs and example snippets referenced below. Treat these as the source of truth.

Prerequisites