Too many unique verts

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There are more than 65535 brush and/or displacement vertices in the map. This is usually caused by having too many brush faces at too low of a luxel scale (since brushes get subdivided every 31 luxels), but can also be caused by having too much brush and/or displacement geometry in general.

Fixes

• Find faces with low luxel scales, and set higher values to reduce subdivision.
• Convert complicated brushwork to models, using a tool such as Propper++.