Open a graph

To open a graph, select it in the Outliner and choose Window > Bifrost Graph Editor.

If the Bifrost Graph Editor is already open, you can select an existing graph from the + icon on the tab bar. The graph opens in a new tab.

Unknown nodes

When you load a scene containing old graphs, some nodes might be "missing". This can happen, for example, if the JSON files that define custom compounds cannot be found, or if custom node definitions refer in turn to nodes with missing definitions.

When this happens, the missing nodes are re-created as "unknown nodes". These appear as dark red nodes in the graph. The graph cannot work as before in this state, because the computations performed by these nodes are unkown.

However, the external connections and input values of the unknown nodes are preserved. This lets you see the graph as it existed before, and gives you a chance to fix or update the graph more easily.

You can copy and paste unknown nodes, as well as modify and save scenes that contain them. You can also explode compounds that contain them, and remove unknown ports using the right-click menu. The graph will work properly once the proper node definitions are available.