Welcome to the LOPs Lighting Tutorial. Houdini’s tooling and support for USD is collectively known as Solaris. Solaris includes USD support in the view and a new network type, LOPs (Light Operators). LOP networks are similar to SOPs, where each node accepts incoming geometry, modifies it, and outputs new geometry. In LOPs, each node accepts an incoming USD scene, modifies it, and outputs a new scene. LOPs also features Houdini’s new renderer, Karma, which consumes usd instead of ifd, which mantra consumed. The LOPs context features many new enhancements to make lighting faster and more efficient.