Houdini 20.0 Reference Panes

Scene graph layers pane

Displays a tree representing the USD layers which Houdini composes together to make the final USD stage. Lets you temporarily “mute” and “un-mute” referenced layers.

On this page


  • This pane shows the layers created/referenced by the LOP network, and the hierarchical relationship between the layers. It can help visualize the layers created by nodes in a LOPs network before they are composed together into the final USD stage.

  • See USD basics for more information on USD layers and composition.

  • The first item is the “root layer” of the stage. Its children are the layers that will be composed together to form the final stage. Each item may have its own children which are composed to form the parent layer.

  • Layers may be created directly by LOPs, or referenced from a USD file on disk, or a payload file (such as a large geometry file).

  • The tree view also shows some metadata about they layers in different columns, such as their path on disk (if they come from a file), and the up-axis and unit scale they were created with.

  • Like the scene graph tree pane, this pane shows the stage as it exists down to the selected node, not the display flag. You can click around the nodes to see how the layer stack is different at different points in the network.

How to

To...Do this

Find the layer(s) contributing to selected prims

If you select a primitive in the scene graph tree pane, any layers in this pane that contribute opinions to those primitives turn Orange.

Hide a layer in the viewer temporarily (mute layers)

This only hides the layer in the view (like the visibility and activation controls in the scene graph tree pane). This may help you visualize/understand how the layers affect the final stage.

  • For the layer you want to mute, turn on the checkbox in the Mute in Viewport column of the tree.

  • This is the last column, so you may need to scroll or resize the pane to see it.

  • Only referenced layers can be muted. If a layer does not have a checkbox in this column, it can’t be muted.

Find layers affected by the current LOP node

Layers that were modified by the current LOP node or any nodes inside the current LOP node will appear Green.