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I used the difference procedure to create a “door” and “windows” on a single plane. (placing 3 joined cubes through the plane and using the “difference” modifier to create the apertures) After overlaying the test map the result shows unexpected lines, indicated with yellow lines, on the resulting map. I uploaded the results (Second life) and it appears to look ok.

I could use Loop cuts to get the same result but was wondering if anybody knows what is happening enter image description here(the unexpected lines) and if this is going to cause issues elsewhere.

I have applied rotation and scale modifier, remove double vertices and reset origin to centre

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  • $\begingroup$ Concave polygons can create these artifacts, so dont use this method. Use the loop cut tool (Ctrl+R) to define the window's borders, then delete the faces. $\endgroup$ – FFeller Nov 5 '19 at 17:54
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Using the Boolean to cut the openings left the object with only 2 faces, Filling in these Concave Ngons caused the lines you see in the UV space. If you enable the face select mode this will become more obvious.

enter image description here

These Ngons will not be a problem as such once the object is imported into SL as the importer will convert those Ngons to triangles. enter image description here

But as FFeller suggested using loop cuts is a much better way to go about this simply because you have more control over the geometry:

enter image description here

And having more control means it will be a lot easier to optimize the model ( = Lower LI costs) , easier to create lower LoD models and Physics model later in the process. So best to avoid Boolean cutting for SL :) enter image description here

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  • $\begingroup$ Thank you both for the detailed explanations on this issue - I will certainly be using loop cuts from now on - happy days. $\endgroup$ – Matti Nov 6 '19 at 0:35
  • $\begingroup$ Forgot to mention the optimization by merging non contributing vertices - something else new I have picked up today. Rock on StackExchange ! $\endgroup$ – Matti Nov 6 '19 at 0:50

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