When working with multiple UV island you want to be able to stack them when using trim sheets etc. Blender doesn't have a stacking feature, making the process time consuming, especially if you want to do the same process for things like fences etc that has a lot of UV islands. In other applications this is a one button press to stack UV Shells. This feature request is also discussed here:
Instead of having a “stack uv islands” feature it’s better to use copy/paste UV.
Why not “stack uv islands”?
- How would the code possibly “know” which UV coordinate is the source if the current object contains multiple uv island that are matching in vertex count? Therefore it’s better with copy/paste functionality.
What is better with copy/paste?:
- It is very clear how to define the source UV coordinate (selecting UV’s and “pressing copy UV”).
- The code can store multiple source UV islands coordinates. Therefore it is fewer clicks for the user.
The user press the button “copy uv”
- Based on current selection - a list is stored in memory per UV island containing
- Vertex count
- Vertex index
- Uv position per vertex index
Select target UV
The user selects one or multiple objects (only one object selected in this example)
Note that in next step (step 3) the selected uv island will match the uv’s per UV island stored in memory. The first UV island found in memory that matches the vertex count of the current selected UV island in current code iteration (for loop) will get the same UV coordinates as the matching UV island in memory.
The user presses the button “paste UV”. The two smaller islands in the image will now have “stacked” uv islands that sit on top of each other.