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Access: Nodes > Geometry > Geo-Channel
The Geo-Channel system allows you to use the same material on a variety of models to achieve the look of edge wear and tear and other photo-realistic effects on your meshes. You might not know what geometries will be used when authoring a material. Geo-Channels solve this by driving geometry-agnostic data, such as curvature and ambient occlusion maps into your material setup. The Geo-Channel node points the material at specifically set up Geo-Channels on your object.
You can use the Geo-Channel node anywhere in the Node Graph by making sure Geo-Channels have been setup for your object under the Geo-Channel Properties in the Objects palette. See Adding Geo-Channels to Objects for more information.
Tip: You can also export baked data from Bake Point nodes directly into Geo-Channels, to act as an intermediate caching point for complex Node Graph setups that can then be added to your Node Graph through a Geo-Channel node. See the Bake Point Node and Working with Nodes for more information.
Geo-Channel Node Properties
Select the Geo-Channel alias from the dropdown box to be used by the Geo-Channel node.
Fills any UDIMS on the geometry not included in the Geo-Channel with the selected color. For example, if your geometry has UDIMS 1001-1003 but your Geo-Channel only has 1001-1002, 1003 is filled with the selected background color.
Assigning a Geo-Channel to a Geo-Channel Node
Note: Make sure you have Geo-Channels setup on your object. See Adding Geo-Channels to Objects for more information.
|1.||Press tab, type 'Geo-Channel' and select the resulting Geo-Channel node.|
|2.||Double click the Geo-Channel node in the Node Graph to bring up the node properties.|
|3.||Click the Channels dropdown and click the geo-channel you want to use with this Geo-Channel node.|
The Geo-Channel node updates visually with a blue icon and channel name to represent the Geo-Channel you selected.
Importing Materials with Geo-Channels into New Projects
When you import a material containing a Geo-Channel into a new project, if the Geo-Channel is missing from the object(s) in your project, double-clicking the material in the node graph displays a warning in the node properties. The missing Geo-Channels are displayed in the Missing Geo-Channel(s) panel.
Tip: Click the Geo-Channel layer in the Layers Palette to open the Geo-Channel properties when working with layers instead of the Node Graph.
Tip: See Working with Materials in the Node Graph for more information on exporting and importing materials.
To add the missing Geo-Channel:
|1.||Click Geo-Channel Properties.|
This opens the Geo-Channel Properties tab.
|2.||See Adding Geo-Channels to Objects for information on how to add a Geo-Channel to the object.|
Note: Make sure the geo-channel name matches the geo-channel selected in the Geo-Channel node.
Geo-Channel Node Workflow Example
Creating Edge Wear and Tear Using Geo-Channels
Geo-channels can be used in a material pipeline to create realistic wear and tear such as rust, chipped paint, or worn leather on your objects. Since geo-channels are geometry-agnostic, you can use the same material across a variety of objects while ensuring the material looks realistic for the specific object. The Geo-Channel node is most useful when used as a mask on the object.
In the video:
• What are Geo-Channels?
• How are Geo-Channels useful to you?
• You learn how to add Geo-Channel properties in the Object Palette.
• You learn how to add a Geo-Channel node to your material setup.
• You learn how to export your material setup to be used in other Mari projects.
• You learn how to importing your materials to other Mari projects and how to deal with missing Geo-Channels.
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