### Layerbreak Imagine you are working in a lighting department. You receive a file from the set dressing department. It contains a landscape, with a scratch light called `/Lights/scratch_sun1` created by the set designers. You need to author a layer that removes the scratch light and adds production-quality lighting. 1. Use a [Sublayer LOP](https://www.sidefx.com/docs/houdini/nodes/lop/sublayer.html "Imports from USD files or other LOP node chains into as sublayers, or removes/replaces/reorders existing sublayers.") to load in `landscape.usd`. 2. Append a **Layer Break LOP**. This indicates that **nothing above this node should be included when the new layer is written to disk**. 3. Select the scratch light (`/Lights/scratch_sun1`) and use a [Prune LOP](https://www.sidefx.com/docs/houdini/nodes/lop/prune.html "Hides or deactivates primitives and point instances.") to deactivate it. Note that because the Layer Break doesn’t affect the composition of in-memory layers, the light is still available to select, even though it comes from above a Layer Break. 4. Add new production quality lights. 5. Add a [USD render node](https://www.sidefx.com/docs/houdini/nodes/out/usd.html "Renders a LOP network out to one or more USD files. This node is available as render node or as a LOP.") to write out the network as a layer file called `lighting.usd`. As explained above, the USD render node won’t write anything above the layer break. The file won’t include any data from `landscape.usd` in `lighting.usd`. However, `lighting.usd` layer _does_ contain an override saying to deactivate `/Lights/scratch_sun1` (the Prune was after the Layer Break, and the attributes it authored aren’t affected). Of course, `/Lights/scratch_sun1` doesn’t exist in `lighting.usd`. But when we _layer_ `lighting.usd` over `landscape.usd` later, the prim path will match up and the lighting layer will deactivate the scratch light. So, in a Solaris network, you can load data to provide **context for edits**, and prevent the “context data” from being written to disk by putting it before a Layer Break node in the network.