MAX MAP BRUSHSIDES

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MAX_MAP_BRUSHSIDES occurs when your map exceeds the VBSP 19 maximum defined brush amount.

The current limit is 65536, this is due to the VBSP 19 format using integers to allocate number of brushsides, and because 65536 is the largest possible number allowed in 16-bit computer architecture.

There is no fix for this without altering the BSP format and possibly breaking compatibility.

Perhaps in the future valve will release VBSP 20 with more allowable brushsides.