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Merge 3D controls
Controls Tab
The Controls tab is used only to pass through any lights connected to the Merge 3D node.
When the Pass Through Lights checkbox is selected, lights are passed through the Merge into its output to affect downstream elements. Normally, the lights are not passed downstream to affect the rest of the scene. This is frequently used to ensure projections are not applied to geometry introduced later in the scene.
Common Controls
The remaining controls for the Transform and Settings tabs are common to most 3D nodes. Their descriptions can be found in “The Common Controls” section at the end of this chapter.
Override 3D [3Ov]
The Override 3D node
Override 3D Node Introduction
The Override node lets you change object-specific options for every object in a 3D scene simultaneously. This is useful, for example, when you wish to set every object in the input scene to render as a wireframe. Additionally, this node is the only way to set the wireframe, visibility, lighting, matte, and ID options for 3D particle systems and the Text 3D node.
Inputs
— SceneInput: The orange Scene input accepts the output of a Merge 3D node or any node creating a 3D scene.
Basic Node Setup
The Override 3D node is frequently used in conjunction with the Replace Material node to produce isolated passes. For example, in the node tree below, a scene branches out to an Override node that turns off the Affected by Lights property of each node, then connects to a Replace Material node that applies a Falloff shader to produce a falloff pass of the scene.
Override 3D connected to a Replace Material node
Inspector
Override 3D controls