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QuickTip for LSCM UVs (Unwrap 3D Pro)


Often, when dealing with seams, a problem arises if a vertex shares more than one UV coordinate. LSCM UVs may not unwrap the model as expected. To solve this problem, Unwrap 3D Pro provides a handy tool called Mark Boundary VEdges By UV. This tool will mark all vertex edges by the UV boundary of the face selection. When a vertex edge is marked, it will be cut prior to unwrapping, allowing the vertices along that edge to have its own UV coordinates.

Here is a quick example of using the Mark Boundary VEdges By UV tool.

Let's say we wanted to unwrap a head model using LSCM UVs. Typically, we would use the Seam tool to mark the vertex edges where we want to unwrap, all by hand. A quicker way is to take advantage of the Mark Boundary VEdges By UV tool.

qt_lscm1.png

First, we need some quick UVs. Click Ctrl+A to select all faces, then click 2D Tools | UV Mapping | Spherical. The UVs will be unwelded, so weld them using 2D Tools | Weld UVs. Welding UVs is necessary to create a UV boundary:

qt_lscm2.png

Now, click Ctrl+A to select all faces again, then click Edit | Seam | Mark Boundary VEdges By UV:

qt_lscm3.png

As you can see, the UV boundary was converted into marked vertex edges. A magenta colored edge means that vertex edge is marked for cutting.

Now, click 2D Tools | LSCM UVs:

qt_lscm4.png

Our entire head model is now unwrapped. Note that we locked two boundary UVs to make the unwrapping more symmetrical.

qt_lscm5.png


That's it! If you have any other questions about LSCM UVs or marking vertex edges, please let us know.




 
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