// mins x    y            z             maxs         y            z
00 00 80 3f  00 00 00 40  00 00 40 40   00 00 80 40  00 00 a0 40  00 00 c0 40

// face             n_faces
00 00 00 00         01 00 00 00

// brush            n_brushes
00 00 00 00         01 00 00 00