Without Maya or blender :
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Create brush
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Transform with “Create Static Mesh” button
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Rename your mesh, then double-click on the new mesh thumbnail (Enter in the Mesh editor)
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Below Static Mesh Settings, change “Light Map resolution” to 128
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Click on the top menu “Window”, then click on "Generate Unique UVs)
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Click on Apply
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Below Static Mesh Settings, open bottom panel and change “Light Map Coordinate Index” to 1
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Save your Mesh and Build
