omni.rtx.spg: RTX Sensor Processing Graphs# omni.rtx.spg RTX Sensor Processing Graphs [omni.rtx.spg] Prerequisites How SPG Works Walkthrough: Grayscale Conversion of LdrColor Step 1: The CUDA Kernel Step 2: The Lua Launch Script Step 3: The USD Shader Definition Step 4: The Scene File Step 5: Run It Understanding the Architecture The Three Layers Walkthrough: Chaining Shaders – Grayscale + Invert New Concepts Step 1: The CUDA Kernel Step 2: The Lua Launch Script Step 3: The USD Shader Definition Step 4: The Scene File Step 5: Run It Known Limitations Lua cuda Module Reference dtype Constants Output Allocation Kernel Argument Wrappers Cached Computation Kernel Launch Global Variables Logging Functions Launch Script Function Signature Lua Editor Support Glossary