Keyboard Shortcuts: Alt-C, Alt-G, Shift-C
Modes: F4

Available in Island Mode (F4) only, The TopoCopy toolset was created to make it even easier to work with geometrically or topologically similar islands in your model. As it looks for similar elements in your model, even if they are geometrically, but not topologically different, you can now truly copy cuts and unwraps from one island to another, including topology that had pinch or spread fixed, or was just in need of a little tender love, care and optimizing.
The workflow is to select one, or more different islands with identical (like symmetrical or instanced items) geometry, and then unwrap these. Once unwrapped, you copy this to the other islands using the TopoCopy toolset.


Topology Reference

The Topology Reference lets you select which type of islands RizomUV will use to compare the unwrapped, or otherwise modified geometry with the remaining, similar islands. There are two options in the dropdown:


Cut means the current UV space topology is used. You typically use Cut on islands that come from the same 3D element. For example, if you load a sphere (which is one single element), that you cut in 2 identical parts, and want to copy your selection or your coordinates from one part to the other one.

Please note that if you further add some cuts in one of these 2 identical islands, they will be no more topologically identical, so topocopy won't work anymore


Uncut means that you will use the original 3D topology for the comparison.

Symmetry mode

Symmetry Mode tells Rizom which islands to process with a dropdown, Both, Straight, and Symmetric:


Rizom to process islands that have the same topology and normal orientation, as well as symmetrically identical, but inverted islands.


TopoCopies geometrically identical islands with the same normal orientation only.

Similar Symmetric

TopoCopies islands that share the same topology and have inverted normal orientations including symmetric parts.

Island(s) Source

Source Islands tells the unwrapped or optimised island how it should distribute the new topology. In the dropdown, you have two options:

Selection to All

uses the selected and unwrapped or tweaked island as the source and will propagate the new topology to all visible (and similar) islands.

First Selected to Selection

uses the selected and unwrapped or tweaked island as the source, and then propagates the new settings to the islands you have selected (remember to CTRL+Click to select!).


The Similarity slider controls the similarity parameters Rizom needs to process an island. If the slider is at 0, all topologically similar islands will be processed. Set to 1, Rizom will process islands of exact matching geometry. It's worth noting both topology and 3D coordinates (geometry) will be taken into consideration when Rizom compares islands for similarity under the hood.


Select Similar

Provided that your islands are similar enough, Select Similar copies of your selection across islands with the same topology. As of version 2020.1.100, this also includes islands, the selection process is no longer limited to edges.
So if you are in Point(F1), Edge(F2) Poly(F3), and Island mode(F4), use Alt + C to copy your selections.
Please note that as of the winter 2020 release, CTRL + M is obsolete.
New Shortcut: Alt-C

Update Similar

Updates the seams and the UV coordinates of the similar islands provided that their similarity matches. It's worth noting that this is not the same as the Stack Similar function, as Update Similar leaves the islands at their current location rather than collecting them on top of each other to form a stack.

Stack Similar

Stack Similar runs the TopoCopy operation and then moves the unwrapped and TopoCopied islands on top of each other so they form a stack, provided that they are sufficiently similar
Please Note: Unlike Stack and Group Similar, this option will not Group the stack when it’s done stacking. Use the button next to it, Stack/Group Similar.
Shortcut: Shift-C

Stack and Group Similar

Stack and Group Similar runs the TopoCopy operation, and then moves the unwrapped and TopoCopied islands on top of each other so they form a stack, provided their similarity matches your criteria. After stacking, it will then group the stacked islands and semi-lock them, so the grouped stack won’t move.
To ungroup/unstack, press CTRL+G
Shortcut: Alt-G