Extend Mesh Section
Extend an ancestor's material: add a new mesh section, and add its corresponding texture to the ancestor's material texture parameters.
This node is a modifier and has all the standard modifier properties. In addition to that, this node has the following properties:
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Reference Material: The reference material that determines the parameters that can be edited. One texture pin and one mask pin is exposed per texture parameter that the material has. It is usually the same material used by the Mesh Sections being edited.
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Enable Tags: Tags that will be enabled when this modifier is applied to any mesh section. This is also the tag list used to decide what other modifiers are applied to the extended mesh data (but not the originally modified data).
The new mesh fragment is supplied through the Add Mesh input. For each texture parameter in the Reference Material, a texture pin is exposed for the texture added to the modified mesh section. The modified mesh section's material layout partition size defines the relative sizes of these added textures, and each modified material texture's resolution defines the resolution of one block for the added mesh. It is mandatory to connect all of these pins; otherwise the merged mesh would lack texture data for some channels.