IDataflowConstructionViewMode

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Dataflow Construction View Modes allow the user to choose different views on the same node output. The View Mode system serves two main purposes:

1) In the DataflowEditor's Construction Viewport, the currently active IDataflowConstructionViewMode will determine which ELevelViewportType should be used for rendering. In other words, the the ViewMode will determine whether we have a 3D perspective camera or a 2D orthographic camera. 2) In the Datflow Rendering Factory (UE::Dataflow::FRenderingFactory), the rendering callbacks that are registered will also be able to return different render data based on what the currently active IDataflowConstructionViewMode in the viewport is.

For example, suppose you have created a new type FMyMeshType that contains both a 3D Mesh representation and a 2D Mesh representation (for, say, UVs.) If you want to write custom ViewModes for it, here is the process:

1) Define two new classes, e.g. FMyMeshType2DViewMode (inheriting from FDataflowConstruction2DViewModeBase) and FMyMeshType3DViewMode (inheriting from FDataflowConstruction3DViewModeBase) 2) In your module initialization, register both view modes with the UE::Dataflow::FRenderingViewModeFactory 3) Create a render function callback class and register it with UE::Dataflow::FRenderingFactory.

• The CanRender function should return true if the view mode is either of your two new custom view modes.
• The Render function should return different RenderCollections depending on what the current view mode is (which can be determined from the FGraphRenderingState parameter.)

Syntax

class IDataflowConstructionViewMode  
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class IDataflowConstructionViewMode

Derived Classes

• FDataflowConstruction2DViewModeBase
• FDataflowConstruction3DViewModeBase

Destructors

Functions

Public