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Enable OpenSubdiv – Enables OpenSubdiv subdivision.

Subdivision level – Specifies the level of OpenSubdiv subdivision. A value of 0 means no subdivision.

Type – Specifies the type of subdivision used.

Catmull-Clark – The default subdivision method which can handle meshes with arbitrary polygons (triangles, quads, etc);
Loop – This subdivision method works with triangles only.

Subdivide UVs – Smooths UVs when applying subdivision with OpenSubdiv. 

Preserve map borders – Specifies different modes for subdividing the UV boundaries with OpenSubdiv from None, Internal, and All.

None – UVs are always subdivided regardless of whether they are on a UV seam or not;
Internal – Only preserve UVs if they are on an internal UV seam;
All – Does not subdivide UVs on UV seams.

Preserve geometry borders – Keeps the geometry boundaries in place while subdividing the mesh with OpenSubdiv.

Enable All – Enables all parameters in this tab at once.

Disabled All – Disables all parameters in this tab at once.

Mode – Specifies the mode of locking the Tri-Planar mapping. You can choose between Object (uses another object as reference) and Rest Attributes  (uses an attribute of the object as reference). Download an example test scene here.

Reference Object – Specifies the object used as reference to lock the Tri-Planar mapping when Object mode is selected.

Position – Specifies the position when Rest Attributes mode is selected.

Normal – Specifies the normals when Rest Attributes mode is selected.

Enable All – Enables all parameters in this tab at once.

Disabled All – Disables all parameters in this tab at once.

Mode is None

Mode is Object

Mode is Rest Attributes